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		9 Months Ended
	Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2025	Sep. 30, 2024	Dec. 31, 2024
Variable Interest Entity [Line Items]
Carrying value of receivables in trusts	$ 1,165,900		$ 1,165,900		$ 1,095,835
Long-term debt	311,484		311,484		283,279
Total assets	$ 3,403,716	$ 3,324,293	$ 3,403,716	$ 3,324,293	$ 3,261,519
Investment Proportional Amortization Method Elected Statement Of Financial Position Extensible Enumeration Not Disclosed Flag	true		true		true
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	true	true
Customer Vehicles
Variable Interest Entity [Line Items]
Maximum loss exposure	$ 1,400		$ 1,400		$ 1,100
Collateralized Debt Obligations
Variable Interest Entity [Line Items]
Maximum loss exposure	63		63		65
Investment Vehicles
Variable Interest Entity [Line Items]
Maximum loss exposure	4,100		4,100		2,500
Tax Credit Vehicles
Variable Interest Entity [Line Items]
Investments in affordable housing project investments	16,500		16,500		16,700
Unfunded commitments	7,000		$ 7,000		7,500
Unfunded commitment payment period			5 years
Tax credits and other benefits	590	$ 564	$ 1,700	$ 1,700
Pretax losses	$ 458	$ 418	$ 1,300	$ 1,200
Investment Program, Proportional Amortization Method, Elected, Income Tax Credit and Other Income Tax Benefit, before Amortization, Statement of Income or Comprehensive Income [Extensible Enumeration]	Other income (loss)	Other income (loss)	Other income (loss)	Other income (loss)
Renewable Energy Investments
Variable Interest Entity [Line Items]
Equity investments	$ 11,600		$ 11,600		13,000
Unfunded capital contributions	4,200		$ 4,200		4,600
Term of unfunded capital contributions (in years)			2 years
Tax credits and other tax benefits related to renewable energy investments	922	$ 873	$ 2,500	$ 2,800
Pretax losses in renewable energy investments	552	697	1,800	2,000
Consolidated VIEs
Variable Interest Entity [Line Items]
Carrying value of receivables in trusts	18,007		18,007		19,144
Long-term debt	8,420		8,420		8,457
Total assets	23,795		23,795		24,119
Consolidated VIEs \| Investment Vehicles
Variable Interest Entity [Line Items]
Total assets	24		24		6
Consolidated VIEs \| Leveraged Lease Trusts
Variable Interest Entity [Line Items]
Total assets	915		915		1,000
Unconsolidated VIEs
Variable Interest Entity [Line Items]
Liquidity commitments to unconsolidated securitization trusts	1,100		1,100		1,000
Unconsolidated VIEs \| Investment Vehicles
Variable Interest Entity [Line Items]
Total assets	27,800		27,800		23,000
Unconsolidated VIEs \| Tax Credit Vehicles
Variable Interest Entity [Line Items]
Total assets	87,300		87,300		85,700
Credit Card and Automobile \| Consolidated VIEs
Variable Interest Entity [Line Items]
Carrying value of receivables in trusts	17,074		17,074		18,110
Long-term debt	7,917		7,917		7,975
Maximum loss exposure	8,443		8,443		9,385
Total assets	16,382		16,382		17,381
Credit Card and Automobile \| Unconsolidated VIEs
Variable Interest Entity [Line Items]
Carrying value of receivables in trusts	0		0		0
Maximum loss exposure	0		0		0
Total assets	0		0		0
Resecuritization Trusts
Variable Interest Entity [Line Items]
Cash proceeds from new securitizations	6,600	4,600	25,100	11,100
Securities
Variable Interest Entity [Line Items]
Cash proceeds from new securitizations	1,400	$ 1,300	4,200	$ 2,200
Municipal Bonds \| Unconsolidated VIEs
Variable Interest Entity [Line Items]
Liquidity commitments to unconsolidated securitization trusts	$ 2,800		$ 2,800		$ 1,800
Weighted average remaining life of bonds held in the trusts in years			9 years 10 months 24 days