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Loans - Schedule of Debtor Troubled Debt Restructuring, Subsequent Periods (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2023
Financing Receivable, Modified, Subsequent Default [Line Items]
Amount	$ 1,200
Entity Loan Modification Program
Financing Receivable, Modified, Subsequent Default [Line Items]
Amount	1,318	$ 1,367
Interest rate reduction | Entity Loan Modification Program
Financing Receivable, Modified, Subsequent Default [Line Items]
Amount	801	304	$ 109
Term extension | Entity Loan Modification Program
Financing Receivable, Modified, Subsequent Default [Line Items]
Amount	38	303	112
Interest rate reduction and term extension | Entity Loan Modification Program
Financing Receivable, Modified, Subsequent Default [Line Items]
Amount	423	451	236
Other Modifications | Entity Loan Modification Program
Financing Receivable, Modified, Subsequent Default [Line Items]
Amount	56	309	457
Credit Card: | Entity Loan Modification Program
Financing Receivable, Modified, Subsequent Default [Line Items]
Amount	867	307
Credit Card: | Entity Loan Modification Program | Personal loans
Financing Receivable, Modified, Subsequent Default [Line Items]
Amount	63
Credit Card: | Interest rate reduction | Entity Loan Modification Program
Financing Receivable, Modified, Subsequent Default [Line Items]
Amount	801	304	109
Credit Card: | Interest rate reduction | Entity Loan Modification Program | Personal loans
Financing Receivable, Modified, Subsequent Default [Line Items]
Amount	0
Credit Card: | Term extension | Entity Loan Modification Program
Financing Receivable, Modified, Subsequent Default [Line Items]
Amount	10	0	0
Credit Card: | Term extension | Entity Loan Modification Program | Personal loans
Financing Receivable, Modified, Subsequent Default [Line Items]
Amount	10
Credit Card: | Interest rate reduction and term extension | Entity Loan Modification Program
Financing Receivable, Modified, Subsequent Default [Line Items]
Amount	13	3	1
Credit Card: | Interest rate reduction and term extension | Entity Loan Modification Program | Personal loans
Financing Receivable, Modified, Subsequent Default [Line Items]
Amount	10
Credit Card: | Other Modifications | Entity Loan Modification Program
Financing Receivable, Modified, Subsequent Default [Line Items]
Amount	43	0	110
Credit Card: | Other Modifications | Entity Loan Modification Program | Personal loans
Financing Receivable, Modified, Subsequent Default [Line Items]
Amount	43
Credit Card: | Domestic credit card: | Entity Loan Modification Program
Financing Receivable, Modified, Subsequent Default [Line Items]
Amount	713	231
Credit Card: | Domestic credit card: | Interest rate reduction | Entity Loan Modification Program
Financing Receivable, Modified, Subsequent Default [Line Items]
Amount	710	228	89
Credit Card: | Domestic credit card: | Term extension | Entity Loan Modification Program
Financing Receivable, Modified, Subsequent Default [Line Items]
Amount	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	3	3	1
Credit Card: | Domestic credit card: | Other Modifications | Entity Loan Modification Program
Financing Receivable, Modified, Subsequent Default [Line Items]
Amount	0	0	90
Credit Card: | International card businesses: | Entity Loan Modification Program
Financing Receivable, Modified, Subsequent Default [Line Items]
Amount	91	76
Credit Card: | International card businesses: | Interest rate reduction | Entity Loan Modification Program
Financing Receivable, Modified, Subsequent Default [Line Items]
Amount	91	76	20
Credit Card: | International card businesses: | Term extension | Entity Loan Modification Program
Financing Receivable, Modified, Subsequent Default [Line Items]
Amount	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
Credit Card: | International card businesses: | Other Modifications | Entity Loan Modification Program
Financing Receivable, Modified, Subsequent Default [Line Items]
Amount	0	0	20
Consumer Banking: | Entity Loan Modification Program
Financing Receivable, Modified, Subsequent Default [Line Items]
Amount	418	457
Consumer Banking: | Entity Loan Modification Program | Auto
Financing Receivable, Modified, Subsequent Default [Line Items]
Amount	418	456
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
Consumer Banking: | Interest rate reduction | Entity Loan Modification Program | Auto
Financing Receivable, Modified, Subsequent Default [Line Items]
Amount	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	8	9	15
Consumer Banking: | Term extension | Entity Loan Modification Program | Auto
Financing Receivable, Modified, Subsequent Default [Line Items]
Amount	8	8	15
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	410	448	235
Consumer Banking: | Interest rate reduction and term extension | Entity Loan Modification Program | Auto
Financing Receivable, Modified, Subsequent Default [Line Items]
Amount	410	448	235
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	250
Consumer Banking: | Other Modifications | Entity Loan Modification Program | Auto
Financing Receivable, Modified, Subsequent Default [Line Items]
Amount	0	0	250
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	33	603
Commercial Banking: | Entity Loan Modification Program | Commercial and multifamily real estate
Financing Receivable, Modified, Subsequent Default [Line Items]
Amount	11	223
Commercial Banking: | Entity Loan Modification Program | Commercial and industrial
Financing Receivable, Modified, Subsequent Default [Line Items]
Amount	22	380
Commercial Banking: | Interest rate reduction | Entity Loan Modification Program
Financing Receivable, Modified, Subsequent Default [Line Items]
Amount	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
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	20	294	97
Commercial Banking: | Term extension | Entity Loan Modification Program | Commercial and multifamily real estate
Financing Receivable, Modified, Subsequent Default [Line Items]
Amount	0	169	46
Commercial Banking: | Term extension | Entity Loan Modification Program | Commercial and industrial
Financing Receivable, Modified, Subsequent Default [Line Items]
Amount	20	125	51
Commercial Banking: | Interest rate reduction and term extension | Entity Loan Modification Program
Financing Receivable, Modified, Subsequent Default [Line Items]
Amount	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
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	13	309	97
Commercial Banking: | Other Modifications | Entity Loan Modification Program | Commercial and multifamily real estate
Financing Receivable, Modified, Subsequent Default [Line Items]
Amount	11	54	46
Commercial Banking: | Other Modifications | Entity Loan Modification Program | Commercial and industrial
Financing Receivable, Modified, Subsequent Default [Line Items]
Amount	$ 2	$ 255	$ 51

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