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Loans - Schedule of Debtor Troubled Debt Restructuring, Subsequent Periods (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2025	Jun. 30, 2024	Jun. 30, 2025	Jun. 30, 2024
Financing Receivable, Modified, Subsequent Default [Line Items]
Amount	$ 3,100
Entity Loan Modification Program
Financing Receivable, Modified, Subsequent Default [Line Items]
Amount	337	$ 504	$ 679	$ 769
Interest rate reduction | Entity Loan Modification Program
Financing Receivable, Modified, Subsequent Default [Line Items]
Amount	213	71	451	162
Term Extension | Entity Loan Modification Program
Financing Receivable, Modified, Subsequent Default [Line Items]
Amount	23	61	25	131
Interest rate reduction and term extension | Entity Loan Modification Program
Financing Receivable, Modified, Subsequent Default [Line Items]
Amount	90	117	180	221
Other Modifications | Entity Loan Modification Program
Financing Receivable, Modified, Subsequent Default [Line Items]
Amount	11	255	23	255
Credit Card: | Entity Loan Modification Program
Financing Receivable, Modified, Subsequent Default [Line Items]
Amount	224	72	476	164
Credit Card: | Entity Loan Modification Program | Personal loans
Financing Receivable, Modified, Subsequent Default [Line Items]
Amount	10		23
Credit Card: | Interest rate reduction | Entity Loan Modification Program
Financing Receivable, Modified, Subsequent Default [Line Items]
Amount	213	71	451	162
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	1	0	2	0
Credit Card: | Term Extension | Entity Loan Modification Program | Personal loans
Financing Receivable, Modified, Subsequent Default [Line Items]
Amount	1		2
Credit Card: | Interest rate reduction and term extension | Entity Loan Modification Program
Financing Receivable, Modified, Subsequent Default [Line Items]
Amount	4	1	9	2
Credit Card: | Interest rate reduction and term extension | Entity Loan Modification Program | Personal loans
Financing Receivable, Modified, Subsequent Default [Line Items]
Amount	3		7
Credit Card: | Other Modifications | Entity Loan Modification Program
Financing Receivable, Modified, Subsequent Default [Line Items]
Amount	6	0	14	0
Credit Card: | Other Modifications | Entity Loan Modification Program | Personal loans
Financing Receivable, Modified, Subsequent Default [Line Items]
Amount	6		14
Credit Card: | Domestic credit card: | Entity Loan Modification Program
Financing Receivable, Modified, Subsequent Default [Line Items]
Amount	191	54	408	129
Credit Card: | Domestic credit card: | Interest rate reduction | Entity Loan Modification Program
Financing Receivable, Modified, Subsequent Default [Line Items]
Amount	190	53	406	127
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	1	1	2	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	18	45	35
Credit Card: | International card businesses: | Interest rate reduction | Entity Loan Modification Program
Financing Receivable, Modified, Subsequent Default [Line Items]
Amount	23	18	45	35
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	88	119	174	225
Consumer Banking: | Entity Loan Modification Program | Auto
Financing Receivable, Modified, Subsequent Default [Line Items]
Amount	88	118	174	224
Consumer Banking: | Entity Loan Modification Program | Retail banking
Financing Receivable, Modified, Subsequent Default [Line Items]
Amount	0	1		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	0		0
Consumer Banking: | Term Extension | Entity Loan Modification Program
Financing Receivable, Modified, Subsequent Default [Line Items]
Amount	2	3	3	6
Consumer Banking: | Term Extension | Entity Loan Modification Program | Auto
Financing Receivable, Modified, Subsequent Default [Line Items]
Amount	2	2	3	5
Consumer Banking: | Term Extension | Entity Loan Modification Program | Retail banking
Financing Receivable, Modified, Subsequent Default [Line Items]
Amount	0	1		1
Consumer Banking: | Interest rate reduction and term extension | Entity Loan Modification Program
Financing Receivable, Modified, Subsequent Default [Line Items]
Amount	86	116	171	219
Consumer Banking: | Interest rate reduction and term extension | Entity Loan Modification Program | Auto
Financing Receivable, Modified, Subsequent Default [Line Items]
Amount	86	116	171	219
Consumer Banking: | Interest rate reduction and term extension | Entity Loan Modification Program | Retail banking
Financing Receivable, Modified, Subsequent Default [Line Items]
Amount	0	0		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	0		0
Commercial Banking: | Entity Loan Modification Program
Financing Receivable, Modified, Subsequent Default [Line Items]
Amount	25	313	29	380
Commercial Banking: | Entity Loan Modification Program | Commercial and multifamily real estate
Financing Receivable, Modified, Subsequent Default [Line Items]
Amount	2	0	7	0
Commercial Banking: | Entity Loan Modification Program | Commercial and industrial
Financing Receivable, Modified, Subsequent Default [Line Items]
Amount	23	313	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	0
Commercial Banking: | Term Extension | Entity Loan Modification Program
Financing Receivable, Modified, Subsequent Default [Line Items]
Amount	20	58	20	125
Commercial Banking: | 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: | Term Extension | Entity Loan Modification Program | Commercial and industrial
Financing Receivable, Modified, Subsequent Default [Line Items]
Amount	20	58	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	0
Commercial Banking: | Other Modifications | Entity Loan Modification Program
Financing Receivable, Modified, Subsequent Default [Line Items]
Amount	5	255	9	255
Commercial Banking: | Other Modifications | Entity Loan Modification Program | Commercial and multifamily real estate
Financing Receivable, Modified, Subsequent Default [Line Items]
Amount	2	0	7	0
Commercial Banking: | Other Modifications | Entity Loan Modification Program | Commercial and industrial
Financing Receivable, Modified, Subsequent Default [Line Items]
Amount	$ 3	$ 255	$ 2	$ 255

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