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Loans - Schedule of Debtor Troubled Debt Restructuring, Subsequent Periods (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Financing Receivable, Modified, Subsequent Default [Line Items]
Amount			$ 523
Entity Loan Modification Program
Financing Receivable, Modified, Subsequent Default [Line Items]
Amount	$ 1,367	$ 457
Interest rate reduction | Entity Loan Modification Program
Financing Receivable, Modified, Subsequent Default [Line Items]
Amount	304	109
Term Extension | Entity Loan Modification Program
Financing Receivable, Modified, Subsequent Default [Line Items]
Amount	303	112
Interest Rate Reduction and Term Extension | Entity Loan Modification Program
Financing Receivable, Modified, Subsequent Default [Line Items]
Amount	451	236
Other Modifications | Entity Loan Modification Program
Financing Receivable, Modified, Subsequent Default [Line Items]
Amount	309
Credit Card:
Financing Receivable, Modified, Subsequent Default [Line Items]
Amount			154
Credit Card: | Entity Loan Modification Program
Financing Receivable, Modified, Subsequent Default [Line Items]
Amount	307	110
Credit Card: | Interest rate reduction | Entity Loan Modification Program
Financing Receivable, Modified, Subsequent Default [Line Items]
Amount	304	109
Credit Card: | Term Extension | Entity Loan Modification Program
Financing Receivable, Modified, Subsequent Default [Line Items]
Amount	0	0
Credit Card: | Interest Rate Reduction and Term Extension | Entity Loan Modification Program
Financing Receivable, Modified, Subsequent Default [Line Items]
Amount	3	1
Credit Card: | Other Modifications | Entity Loan Modification Program
Financing Receivable, Modified, Subsequent Default [Line Items]
Amount	0
Credit Card: | Domestic credit card:
Financing Receivable, Modified, Subsequent Default [Line Items]
Amount			75
Credit Card: | Domestic credit card: | Entity Loan Modification Program
Financing Receivable, Modified, Subsequent Default [Line Items]
Amount	231	90
Credit Card: | Domestic credit card: | Interest rate reduction | Entity Loan Modification Program
Financing Receivable, Modified, Subsequent Default [Line Items]
Amount	228	89
Credit Card: | Domestic credit card: | Term Extension | Entity Loan Modification Program
Financing Receivable, Modified, Subsequent Default [Line Items]
Amount	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	1
Credit Card: | Domestic credit card: | Other Modifications | Entity Loan Modification Program
Financing Receivable, Modified, Subsequent Default [Line Items]
Amount	0
Credit Card: | International card businesses:
Financing Receivable, Modified, Subsequent Default [Line Items]
Amount			79
Credit Card: | International card businesses: | Entity Loan Modification Program
Financing Receivable, Modified, Subsequent Default [Line Items]
Amount	76	20
Credit Card: | International card businesses: | Interest rate reduction | Entity Loan Modification Program
Financing Receivable, Modified, Subsequent Default [Line Items]
Amount	76	20
Credit Card: | International card businesses: | Term Extension | Entity Loan Modification Program
Financing Receivable, Modified, Subsequent Default [Line Items]
Amount	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
Credit Card: | International card businesses: | Other Modifications | Entity Loan Modification Program
Financing Receivable, Modified, Subsequent Default [Line Items]
Amount	0
Consumer Banking:
Financing Receivable, Modified, Subsequent Default [Line Items]
Amount			286
Consumer Banking: | Auto
Financing Receivable, Modified, Subsequent Default [Line Items]
Amount			285
Consumer Banking: | Retail banking
Financing Receivable, Modified, Subsequent Default [Line Items]
Amount			1
Consumer Banking: | Entity Loan Modification Program
Financing Receivable, Modified, Subsequent Default [Line Items]
Amount	457	250
Consumer Banking: | Entity Loan Modification Program | Auto
Financing Receivable, Modified, Subsequent Default [Line Items]
Amount	456	250
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
Consumer Banking: | Interest rate reduction | Entity Loan Modification Program | Auto
Financing Receivable, Modified, Subsequent Default [Line Items]
Amount	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	9	15
Consumer Banking: | Term Extension | Entity Loan Modification Program | Auto
Financing Receivable, Modified, Subsequent Default [Line Items]
Amount	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	448	235
Consumer Banking: | Interest Rate Reduction and Term Extension | Entity Loan Modification Program | Auto
Financing Receivable, Modified, Subsequent Default [Line Items]
Amount	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
Consumer Banking: | Other Modifications | Entity Loan Modification Program | Auto
Financing Receivable, Modified, Subsequent Default [Line Items]
Amount	0
Consumer Banking: | Other Modifications | Entity Loan Modification Program | Retail banking
Financing Receivable, Modified, Subsequent Default [Line Items]
Amount	0
Commercial Banking:
Financing Receivable, Modified, Subsequent Default [Line Items]
Amount			83
Commercial Banking: | Commercial and multifamily real estate
Financing Receivable, Modified, Subsequent Default [Line Items]
Amount			27
Commercial Banking: | Commercial and industrial
Financing Receivable, Modified, Subsequent Default [Line Items]
Amount			$ 56
Commercial Banking: | Entity Loan Modification Program
Financing Receivable, Modified, Subsequent Default [Line Items]
Amount	603
Commercial Banking: | Entity Loan Modification Program | Commercial and multifamily real estate
Financing Receivable, Modified, Subsequent Default [Line Items]
Amount	223
Commercial Banking: | Entity Loan Modification Program | Commercial and industrial
Financing Receivable, Modified, Subsequent Default [Line Items]
Amount	380
Commercial Banking: | Interest rate reduction | Entity Loan Modification Program
Financing Receivable, Modified, Subsequent Default [Line Items]
Amount	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
Commercial Banking: | Interest rate reduction | Entity Loan Modification Program | Commercial and industrial
Financing Receivable, Modified, Subsequent Default [Line Items]
Amount	0	0
Commercial Banking: | Term Extension | Entity Loan Modification Program
Financing Receivable, Modified, Subsequent Default [Line Items]
Amount	294	97
Commercial Banking: | Term Extension | Entity Loan Modification Program | Commercial and multifamily real estate
Financing Receivable, Modified, Subsequent Default [Line Items]
Amount	169	46
Commercial Banking: | Term Extension | Entity Loan Modification Program | Commercial and industrial
Financing Receivable, Modified, Subsequent Default [Line Items]
Amount	125	51
Commercial Banking: | Interest Rate Reduction and Term Extension | Entity Loan Modification Program
Financing Receivable, Modified, Subsequent Default [Line Items]
Amount	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
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
Commercial Banking: | Other Modifications | Entity Loan Modification Program
Financing Receivable, Modified, Subsequent Default [Line Items]
Amount	309	97
Commercial Banking: | Other Modifications | Entity Loan Modification Program | Commercial and multifamily real estate
Financing Receivable, Modified, Subsequent Default [Line Items]
Amount	54	46
Commercial Banking: | Other Modifications | Entity Loan Modification Program | Commercial and industrial
Financing Receivable, Modified, Subsequent Default [Line Items]
Amount	$ 255	$ 51

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