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Loans - Schedule of Debtor Troubled Debt Restructuring, Subsequent Periods (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2025	Sep. 30, 2024
Financing Receivable, Modified, Subsequent Default [Line Items]
Amount			$ 2,100
Entity Loan Modification Program
Financing Receivable, Modified, Subsequent Default [Line Items]
Amount	$ 318	$ 315	915	$ 1,084
Interest rate reduction | Entity Loan Modification Program
Financing Receivable, Modified, Subsequent Default [Line Items]
Amount	186	73	548	235
Term extension | Entity Loan Modification Program
Financing Receivable, Modified, Subsequent Default [Line Items]
Amount	5	104	33	235
Interest rate reduction and term extension | Entity Loan Modification Program
Financing Receivable, Modified, Subsequent Default [Line Items]
Amount	112	110	288	331
Other Modifications | Entity Loan Modification Program
Financing Receivable, Modified, Subsequent Default [Line Items]
Amount	15	28	46	283
Credit Card: | Entity Loan Modification Program
Financing Receivable, Modified, Subsequent Default [Line Items]
Amount	204	73	598	237
Credit Card: | Entity Loan Modification Program | Personal loans
Financing Receivable, Modified, Subsequent Default [Line Items]
Amount	16		47
Credit Card: | Interest rate reduction | Entity Loan Modification Program
Financing Receivable, Modified, Subsequent Default [Line Items]
Amount	186	73	548	235
Credit Card: | Interest rate reduction | Entity Loan Modification Program | Personal loans
Financing Receivable, Modified, Subsequent Default [Line Items]
Amount	0		0
Credit Card: | Term extension | Entity Loan Modification Program
Financing Receivable, Modified, Subsequent Default [Line Items]
Amount	3	0	7	0
Credit Card: | Term extension | Entity Loan Modification Program | Personal loans
Financing Receivable, Modified, Subsequent Default [Line Items]
Amount	3		7
Credit Card: | Interest rate reduction and term extension | Entity Loan Modification Program
Financing Receivable, Modified, Subsequent Default [Line Items]
Amount	4	0	10	2
Credit Card: | Interest rate reduction and term extension | Entity Loan Modification Program | Personal loans
Financing Receivable, Modified, Subsequent Default [Line Items]
Amount	2		7
Credit Card: | Other Modifications | Entity Loan Modification Program
Financing Receivable, Modified, Subsequent Default [Line Items]
Amount	11	0	33	0
Credit Card: | Other Modifications | Entity Loan Modification Program | Personal loans
Financing Receivable, Modified, Subsequent Default [Line Items]
Amount	11		33
Credit Card: | Domestic credit card: | Entity Loan Modification Program
Financing Receivable, Modified, Subsequent Default [Line Items]
Amount	165	52	484	181
Credit Card: | Domestic credit card: | Interest rate reduction | Entity Loan Modification Program
Financing Receivable, Modified, Subsequent Default [Line Items]
Amount	163	52	481	179
Credit Card: | Domestic credit card: | Term extension | Entity Loan Modification Program
Financing Receivable, Modified, Subsequent Default [Line Items]
Amount	0	0	0	0
Credit Card: | Domestic credit card: | Interest rate reduction and term extension | Entity Loan Modification Program
Financing Receivable, Modified, Subsequent Default [Line Items]
Amount	2	0	3	2
Credit Card: | Domestic credit card: | Other Modifications | Entity Loan Modification Program
Financing Receivable, Modified, Subsequent Default [Line Items]
Amount	0	0	0	0
Credit Card: | International card businesses: | Entity Loan Modification Program
Financing Receivable, Modified, Subsequent Default [Line Items]
Amount	23	21	67	56
Credit Card: | International card businesses: | Interest rate reduction | Entity Loan Modification Program
Financing Receivable, Modified, Subsequent Default [Line Items]
Amount	23	21	67	56
Credit Card: | International card businesses: | Term extension | Entity Loan Modification Program
Financing Receivable, Modified, Subsequent Default [Line Items]
Amount	0	0	0	0
Credit Card: | International card businesses: | Interest rate reduction and term extension | Entity Loan Modification Program
Financing Receivable, Modified, Subsequent Default [Line Items]
Amount	0	0	0	0
Credit Card: | International card businesses: | Other Modifications | Entity Loan Modification Program
Financing Receivable, Modified, Subsequent Default [Line Items]
Amount	0	0	0	0
Consumer Banking: | Entity Loan Modification Program
Financing Receivable, Modified, Subsequent Default [Line Items]
Amount	110	111	284	336
Consumer Banking: | Entity Loan Modification Program | Auto
Financing Receivable, Modified, Subsequent Default [Line Items]
Amount	110	111	284	335
Consumer Banking: | Entity Loan Modification Program | Retail banking
Financing Receivable, Modified, Subsequent Default [Line Items]
Amount				1
Consumer Banking: | Interest rate reduction | Entity Loan Modification Program
Financing Receivable, Modified, Subsequent Default [Line Items]
Amount	0	0	0	0
Consumer Banking: | Interest rate reduction | Entity Loan Modification Program | Auto
Financing Receivable, Modified, Subsequent Default [Line Items]
Amount	0	0	0	0
Consumer Banking: | Interest rate reduction | Entity Loan Modification Program | Retail banking
Financing Receivable, Modified, Subsequent Default [Line Items]
Amount				0
Consumer Banking: | Term extension | Entity Loan Modification Program
Financing Receivable, Modified, Subsequent Default [Line Items]
Amount	2	1	6	7
Consumer Banking: | Term extension | Entity Loan Modification Program | Auto
Financing Receivable, Modified, Subsequent Default [Line Items]
Amount	2	1	6	6
Consumer Banking: | Term extension | Entity Loan Modification Program | Retail banking
Financing Receivable, Modified, Subsequent Default [Line Items]
Amount				1
Consumer Banking: | Interest rate reduction and term extension | Entity Loan Modification Program
Financing Receivable, Modified, Subsequent Default [Line Items]
Amount	108	110	278	329
Consumer Banking: | Interest rate reduction and term extension | Entity Loan Modification Program | Auto
Financing Receivable, Modified, Subsequent Default [Line Items]
Amount	108	110	278	329
Consumer Banking: | Interest rate reduction and term extension | Entity Loan Modification Program | Retail banking
Financing Receivable, Modified, Subsequent Default [Line Items]
Amount				0
Consumer Banking: | Other Modifications | Entity Loan Modification Program
Financing Receivable, Modified, Subsequent Default [Line Items]
Amount	0	0	0	0
Consumer Banking: | Other Modifications | Entity Loan Modification Program | Auto
Financing Receivable, Modified, Subsequent Default [Line Items]
Amount	0	0	0	0
Consumer Banking: | Other Modifications | Entity Loan Modification Program | Retail banking
Financing Receivable, Modified, Subsequent Default [Line Items]
Amount				0
Commercial Banking: | Entity Loan Modification Program
Financing Receivable, Modified, Subsequent Default [Line Items]
Amount	4	131	33	511
Commercial Banking: | Entity Loan Modification Program | Commercial and multifamily real estate
Financing Receivable, Modified, Subsequent Default [Line Items]
Amount	4	131	11	131
Commercial Banking: | Entity Loan Modification Program | Commercial and industrial
Financing Receivable, Modified, Subsequent Default [Line Items]
Amount		0	22	380
Commercial Banking: | Interest rate reduction | Entity Loan Modification Program
Financing Receivable, Modified, Subsequent Default [Line Items]
Amount	0	0	0	0
Commercial Banking: | Interest rate reduction | Entity Loan Modification Program | Commercial and multifamily real estate
Financing Receivable, Modified, Subsequent Default [Line Items]
Amount	0	0	0	0
Commercial Banking: | Interest rate reduction | Entity Loan Modification Program | Commercial and industrial
Financing Receivable, Modified, Subsequent Default [Line Items]
Amount		0	0	0
Commercial Banking: | Term extension | Entity Loan Modification Program
Financing Receivable, Modified, Subsequent Default [Line Items]
Amount	0	103	20	228
Commercial Banking: | Term extension | Entity Loan Modification Program | Commercial and multifamily real estate
Financing Receivable, Modified, Subsequent Default [Line Items]
Amount	0	103	0	103
Commercial Banking: | Term extension | Entity Loan Modification Program | Commercial and industrial
Financing Receivable, Modified, Subsequent Default [Line Items]
Amount		0	20	125
Commercial Banking: | Interest rate reduction and term extension | Entity Loan Modification Program
Financing Receivable, Modified, Subsequent Default [Line Items]
Amount	0	0	0	0
Commercial Banking: | Interest rate reduction and term extension | Entity Loan Modification Program | Commercial and multifamily real estate
Financing Receivable, Modified, Subsequent Default [Line Items]
Amount	0	0	0	0
Commercial Banking: | Interest rate reduction and term extension | Entity Loan Modification Program | Commercial and industrial
Financing Receivable, Modified, Subsequent Default [Line Items]
Amount		0	0	0
Commercial Banking: | Other Modifications | Entity Loan Modification Program
Financing Receivable, Modified, Subsequent Default [Line Items]
Amount	4	28	13	283
Commercial Banking: | Other Modifications | Entity Loan Modification Program | Commercial and multifamily real estate
Financing Receivable, Modified, Subsequent Default [Line Items]
Amount	$ 4	28	11	28
Commercial Banking: | Other Modifications | Entity Loan Modification Program | Commercial and industrial
Financing Receivable, Modified, Subsequent Default [Line Items]
Amount		$ 0	$ 2	$ 255

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