Quarterly report [Sections 13 or 15(d)]

Securitizations and Other Variable Interest Entities - Other Asset-backed Securitizations, Narrative (Details)

Securitizations and Other Variable Interest Entities - Other Asset-backed Securitizations, Narrative (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2026	Mar. 31, 2025	Dec. 31, 2025
Variable Interest Entity [Line Items]
Carrying value of receivables in trusts	$ 1,205,035		$ 1,185,700
Long-term debt	325,964		317,816
Total assets	$ 3,496,186	$ 3,349,039	3,411,738
Investment Program Proportional Amortization Method Elected Income Tax Credit And Other Income Tax Benefit Before Amortization Statement Of Cash Flows Extensible Enumeration Not Disclosed Flag	true	true
Customer Vehicles
Variable Interest Entity [Line Items]
Maximum loss exposure	$ 2,100		1,700
Collateralized Debt Obligations
Variable Interest Entity [Line Items]
Maximum loss exposure	63		60
Tax Credit Vehicles
Variable Interest Entity [Line Items]
Total retained positions	24,500		25,400
Investments in affordable housing, renewable energy and certain other projects	23,500		24,400
Unfunded capital contributions	$ 7,500		$ 8,100
Investment Proportional Amortization Method Elected Statement Of Financial Position Extensible Enumeration Not Disclosed Flag	true		true
Investment Program Proportional Amortization Method Elected Income Tax Credit And Other Income Tax Benefit Before Amortization Statement Of Income Or Comprehensive Income Extensible Enumeration Not Disclosed Flag	true	true
Tax credits and other benefits	$ 1,100	$ 1,200
Investment amortization	$ 753	$ 842
Investment Program, Proportional Amortization Method, Applied, Amortization Expense, Statement of Income or Comprehensive Income [Extensible Enumeration]	Income tax expense	Income tax expense
Investment Program, Proportional Amortization Method, Applied, Amortization Expense, Statement of Cash Flows [Extensible Enumeration]	Income tax expense	Income tax expense
Additional gain, losses and other returns	$ 34	$ 20
Renewable Energy Investments
Variable Interest Entity [Line Items]
Equity method investments	1,000
Equity method investments, unfunded commitments	$ 3,500		$ 2,600
Term of unfunded capital contributions (in years)	10 years
Investment Vehicles
Variable Interest Entity [Line Items]
Maximum loss exposure	$ 2,700		2,800
Consolidated VIEs
Variable Interest Entity [Line Items]
Carrying value of receivables in trusts	16,936		17,875
Long-term debt	6,319		6,847
Total assets	23,966		24,852
Consolidated VIEs \| Investment Vehicles
Variable Interest Entity [Line Items]
Total assets	65		58
Consolidated VIEs \| Leveraged Lease Trusts
Variable Interest Entity [Line Items]
Total assets	885		850
Unconsolidated VIEs
Variable Interest Entity [Line Items]
Liquidity commitments to unconsolidated securitization trusts	1,200		1,100
Unconsolidated VIEs \| Tax Credit Vehicles
Variable Interest Entity [Line Items]
Total assets	84,700		86,500
Unconsolidated VIEs \| Investment Vehicles
Variable Interest Entity [Line Items]
Total assets	31,000		30,000
Credit Card and Automobile \| Consolidated VIEs
Variable Interest Entity [Line Items]
Carrying value of receivables in trusts	16,047		17,066
Long-term debt	6,076		6,375
Maximum loss exposure	9,278		9,995
Total assets	15,372		16,388
Credit Card and Automobile \| Unconsolidated VIEs
Variable Interest Entity [Line Items]
Carrying value of receivables in trusts	0		0
Maximum loss exposure	0		0
Total assets	0		0
Total retained positions	0		0
Resecuritization Trusts
Variable Interest Entity [Line Items]
Cash proceeds from new securitizations	12,200	11,400
Securities
Variable Interest Entity [Line Items]
Cash proceeds from new securitizations	843	$ 2,000
Municipal Bonds \| Unconsolidated VIEs
Variable Interest Entity [Line Items]
Liquidity commitments to unconsolidated securitization trusts	$ 3,000		$ 3,000
Weighted average remaining life of bonds held in the trusts in years	9 years 3 months 18 days