Quarterly report [Sections 13 or 15(d)]

Fair Value Option - Gains (Losses) Related to Assets and Liabilities (Details)

Fair Value Option - Gains (Losses) Related to Assets and Liabilities (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2026	Jun. 30, 2025	Jun. 30, 2026	Jun. 30, 2025	Jun. 30, 2024
Fair Value, Option, Quantitative Disclosures [Line Items]
Gains (Losses) Related to Assets and Liabilities Accounted for Under the Fair Value Option		$ (483)	$ 624	$ 1,180	$ (2,584)
Federal funds sold and securities borrowed or purchased under agreements to resell
Fair Value, Option, Quantitative Disclosures [Line Items]
Gains (Losses) Related to Assets and Liabilities Accounted for Under the Fair Value Option	$ (73)	188	(164)	320
Loans reported as trading account assets
Fair Value, Option, Quantitative Disclosures [Line Items]
Gains (Losses) Related to Assets and Liabilities Accounted for Under the Fair Value Option	(20)	63	248	175
Gains (Losses) Related to Borrower-specific Credit Risk for Assets and Liabilities Accounted for Under the Fair Value Option	(21)	(47)	(107)	113
Trading inventory – other
Fair Value, Option, Quantitative Disclosures [Line Items]
Gains (Losses) Related to Assets and Liabilities Accounted for Under the Fair Value Option	1,807	127	(708)	1,834
Consumer and commercial loans
Fair Value, Option, Quantitative Disclosures [Line Items]
Gains (Losses) Related to Assets and Liabilities Accounted for Under the Fair Value Option	148	60	269	79
Gains (Losses) Related to Borrower-specific Credit Risk for Assets and Liabilities Accounted for Under the Fair Value Option	6	(2)	(10)	(2)
Loans held-for-sale
Fair Value, Option, Quantitative Disclosures [Line Items]
Gains (Losses) Related to Assets and Liabilities Accounted for Under the Fair Value Option	6	17	(26)	77
Gains (Losses) Related to Borrower-specific Credit Risk for Assets and Liabilities Accounted for Under the Fair Value Option	4	6	(13)	7
Short-term borrowings
Fair Value, Option, Quantitative Disclosures [Line Items]
Gains (Losses) Related to Assets and Liabilities Accounted for Under the Fair Value Option	(390)	28	(235)	69
Unfunded loan commitments
Fair Value, Option, Quantitative Disclosures [Line Items]
Gains (Losses) Related to Assets and Liabilities Accounted for Under the Fair Value Option	(39)	(11)	(40)	(20)
Gains (Losses) Related to Borrower-specific Credit Risk for Assets and Liabilities Accounted for Under the Fair Value Option	(39)	(11)	(40)	(20)
Accrued expenses and other liabilities
Fair Value, Option, Quantitative Disclosures [Line Items]
Gains (Losses) Related to Assets and Liabilities Accounted for Under the Fair Value Option	(111)	(8)	(187)	(15)
Long-term debt
Fair Value, Option, Quantitative Disclosures [Line Items]
Gains (Losses) Related to Assets and Liabilities Accounted for Under the Fair Value Option	(715)	(628)	(1,764)	(895)
Other
Fair Value, Option, Quantitative Disclosures [Line Items]
Gains (Losses) Related to Assets and Liabilities Accounted for Under the Fair Value Option	11	(319)	23	(444)
Income Statement Location [Axis]: us-gaap:NoninterestIncomeOtherOperatingIncome
Fair Value, Option, Quantitative Disclosures [Line Items]
Gains (Losses) Related to Assets and Liabilities Accounted for Under the Fair Value Option		(169)	(141)	(141)	(322)
Income Statement Location [Axis]: us-gaap:NoninterestIncomeOtherOperatingIncome \| Federal funds sold and securities borrowed or purchased under agreements to resell
Fair Value, Option, Quantitative Disclosures [Line Items]
Gains (Losses) Related to Assets and Liabilities Accounted for Under the Fair Value Option	(2)	(1)	(4)	(3)
Income Statement Location [Axis]: us-gaap:NoninterestIncomeOtherOperatingIncome \| Loans reported as trading account assets
Fair Value, Option, Quantitative Disclosures [Line Items]
Gains (Losses) Related to Assets and Liabilities Accounted for Under the Fair Value Option	1	3	2	3
Income Statement Location [Axis]: us-gaap:NoninterestIncomeOtherOperatingIncome \| Trading inventory – other
Fair Value, Option, Quantitative Disclosures [Line Items]
Gains (Losses) Related to Assets and Liabilities Accounted for Under the Fair Value Option	0	0	0	0
Income Statement Location [Axis]: us-gaap:NoninterestIncomeOtherOperatingIncome \| Consumer and commercial loans
Fair Value, Option, Quantitative Disclosures [Line Items]
Gains (Losses) Related to Assets and Liabilities Accounted for Under the Fair Value Option	6	(3)	(10)	(2)
Income Statement Location [Axis]: us-gaap:NoninterestIncomeOtherOperatingIncome \| Loans held-for-sale
Fair Value, Option, Quantitative Disclosures [Line Items]
Gains (Losses) Related to Assets and Liabilities Accounted for Under the Fair Value Option	6	17	(26)	77
Income Statement Location [Axis]: us-gaap:NoninterestIncomeOtherOperatingIncome \| Short-term borrowings
Fair Value, Option, Quantitative Disclosures [Line Items]
Gains (Losses) Related to Assets and Liabilities Accounted for Under the Fair Value Option	0	0	0	0
Income Statement Location [Axis]: us-gaap:NoninterestIncomeOtherOperatingIncome \| Unfunded loan commitments
Fair Value, Option, Quantitative Disclosures [Line Items]
Gains (Losses) Related to Assets and Liabilities Accounted for Under the Fair Value Option	(39)	(11)	(40)	(20)
Income Statement Location [Axis]: us-gaap:NoninterestIncomeOtherOperatingIncome \| Accrued expenses and other liabilities
Fair Value, Option, Quantitative Disclosures [Line Items]
Gains (Losses) Related to Assets and Liabilities Accounted for Under the Fair Value Option	(95)	(9)	(190)	(9)
Income Statement Location [Axis]: us-gaap:NoninterestIncomeOtherOperatingIncome \| Long-term debt
Fair Value, Option, Quantitative Disclosures [Line Items]
Gains (Losses) Related to Assets and Liabilities Accounted for Under the Fair Value Option	(6)	(6)	(16)	(18)
Income Statement Location [Axis]: us-gaap:NoninterestIncomeOtherOperatingIncome \| Other
Fair Value, Option, Quantitative Disclosures [Line Items]
Gains (Losses) Related to Assets and Liabilities Accounted for Under the Fair Value Option	(12)	(159)	(38)	(169)
Income Statement Location [Axis]: us-gaap:TradingGainsLosses
Fair Value, Option, Quantitative Disclosures [Line Items]
Gains (Losses) Related to Assets and Liabilities Accounted for Under the Fair Value Option		(314)	765	1,321	$ (2,262)
Income Statement Location [Axis]: us-gaap:TradingGainsLosses \| Federal funds sold and securities borrowed or purchased under agreements to resell
Fair Value, Option, Quantitative Disclosures [Line Items]
Gains (Losses) Related to Assets and Liabilities Accounted for Under the Fair Value Option	(71)	189	(160)	323
Income Statement Location [Axis]: us-gaap:TradingGainsLosses \| Loans reported as trading account assets
Fair Value, Option, Quantitative Disclosures [Line Items]
Gains (Losses) Related to Assets and Liabilities Accounted for Under the Fair Value Option	(21)	60	246	172
Income Statement Location [Axis]: us-gaap:TradingGainsLosses \| Trading inventory – other
Fair Value, Option, Quantitative Disclosures [Line Items]
Gains (Losses) Related to Assets and Liabilities Accounted for Under the Fair Value Option	1,807	127	(708)	1,834
Income Statement Location [Axis]: us-gaap:TradingGainsLosses \| Consumer and commercial loans
Fair Value, Option, Quantitative Disclosures [Line Items]
Gains (Losses) Related to Assets and Liabilities Accounted for Under the Fair Value Option	142	63	279	81
Income Statement Location [Axis]: us-gaap:TradingGainsLosses \| Loans held-for-sale
Fair Value, Option, Quantitative Disclosures [Line Items]
Gains (Losses) Related to Assets and Liabilities Accounted for Under the Fair Value Option	0	0	0	0
Income Statement Location [Axis]: us-gaap:TradingGainsLosses \| Short-term borrowings
Fair Value, Option, Quantitative Disclosures [Line Items]
Gains (Losses) Related to Assets and Liabilities Accounted for Under the Fair Value Option	(390)	28	(235)	69
Income Statement Location [Axis]: us-gaap:TradingGainsLosses \| Unfunded loan commitments
Fair Value, Option, Quantitative Disclosures [Line Items]
Gains (Losses) Related to Assets and Liabilities Accounted for Under the Fair Value Option	0	0	0	0
Income Statement Location [Axis]: us-gaap:TradingGainsLosses \| Accrued expenses and other liabilities
Fair Value, Option, Quantitative Disclosures [Line Items]
Gains (Losses) Related to Assets and Liabilities Accounted for Under the Fair Value Option	(16)	1	3	(6)
Income Statement Location [Axis]: us-gaap:TradingGainsLosses \| Long-term debt
Fair Value, Option, Quantitative Disclosures [Line Items]
Gains (Losses) Related to Assets and Liabilities Accounted for Under the Fair Value Option	(709)	(622)	(1,748)	(877)
Income Statement Location [Axis]: us-gaap:TradingGainsLosses \| Other
Fair Value, Option, Quantitative Disclosures [Line Items]
Gains (Losses) Related to Assets and Liabilities Accounted for Under the Fair Value Option	$ 23	$ (160)	$ 61	$ (275)