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Loans - Schedule of Debtor Troubled Debt Restructuring, Subsequent Periods (Details) - Entity Loan Modification Program - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023
Financing Receivable, Modified, Subsequent Default [Line Items]
Amount	$ 315	$ 204	$ 1,084	$ 283
Interest rate reduction
Financing Receivable, Modified, Subsequent Default [Line Items]
Amount	73	23	235	48
Term Extension
Financing Receivable, Modified, Subsequent Default [Line Items]
Amount	104	104	235	106
Interest Rate Reduction and Term Extension
Financing Receivable, Modified, Subsequent Default [Line Items]
Amount	110	77	331	129
Other Modifications
Financing Receivable, Modified, Subsequent Default [Line Items]
Amount	28		283
Credit Card:
Financing Receivable, Modified, Subsequent Default [Line Items]
Amount	73	23	237	48
Credit Card: | Interest rate reduction
Financing Receivable, Modified, Subsequent Default [Line Items]
Amount	73	23	235	48
Credit Card: | Term Extension
Financing Receivable, Modified, Subsequent Default [Line Items]
Amount	0	0	0	0
Credit Card: | Interest Rate Reduction and Term Extension
Financing Receivable, Modified, Subsequent Default [Line Items]
Amount	0	0	2	0
Credit Card: | Other Modifications
Financing Receivable, Modified, Subsequent Default [Line Items]
Amount	0		0
Credit Card: | Domestic credit card:
Financing Receivable, Modified, Subsequent Default [Line Items]
Amount	52	17	181	39
Credit Card: | Domestic credit card: | Interest rate reduction
Financing Receivable, Modified, Subsequent Default [Line Items]
Amount	52	17	179	39
Credit Card: | Domestic credit card: | Term Extension
Financing Receivable, Modified, Subsequent Default [Line Items]
Amount	0	0	0	0
Credit Card: | Domestic credit card: | Interest Rate Reduction and Term Extension
Financing Receivable, Modified, Subsequent Default [Line Items]
Amount	0	0	2	0
Credit Card: | Domestic credit card: | Other Modifications
Financing Receivable, Modified, Subsequent Default [Line Items]
Amount	0		0
Credit Card: | International card businesses:
Financing Receivable, Modified, Subsequent Default [Line Items]
Amount	21	6	56	9
Credit Card: | International card businesses: | Interest rate reduction
Financing Receivable, Modified, Subsequent Default [Line Items]
Amount	21	6	56	9
Credit Card: | International card businesses: | Term Extension
Financing Receivable, Modified, Subsequent Default [Line Items]
Amount	0	0	0	0
Credit Card: | International card businesses: | Interest Rate Reduction and Term Extension
Financing Receivable, Modified, Subsequent Default [Line Items]
Amount	0	0	0	0
Credit Card: | International card businesses: | Other Modifications
Financing Receivable, Modified, Subsequent Default [Line Items]
Amount	0		0
Consumer Banking:
Financing Receivable, Modified, Subsequent Default [Line Items]
Amount	111	84	336	138
Consumer Banking: | Auto
Financing Receivable, Modified, Subsequent Default [Line Items]
Amount	111	84	335	138
Consumer Banking: | Retail banking
Financing Receivable, Modified, Subsequent Default [Line Items]
Amount	0		1
Consumer Banking: | Interest rate reduction
Financing Receivable, Modified, Subsequent Default [Line Items]
Amount	0	0	0	0
Consumer Banking: | Interest rate reduction | Auto
Financing Receivable, Modified, Subsequent Default [Line Items]
Amount	0	0	0	0
Consumer Banking: | Interest rate reduction | Retail banking
Financing Receivable, Modified, Subsequent Default [Line Items]
Amount	0		0
Consumer Banking: | Term Extension
Financing Receivable, Modified, Subsequent Default [Line Items]
Amount	1	7	7	9
Consumer Banking: | Term Extension | Auto
Financing Receivable, Modified, Subsequent Default [Line Items]
Amount	1	7	6	9
Consumer Banking: | Term Extension | Retail banking
Financing Receivable, Modified, Subsequent Default [Line Items]
Amount	0		1
Consumer Banking: | Interest Rate Reduction and Term Extension
Financing Receivable, Modified, Subsequent Default [Line Items]
Amount	110	77	329	129
Consumer Banking: | Interest Rate Reduction and Term Extension | Auto
Financing Receivable, Modified, Subsequent Default [Line Items]
Amount	110	77	329	129
Consumer Banking: | Interest Rate Reduction and Term Extension | Retail banking
Financing Receivable, Modified, Subsequent Default [Line Items]
Amount	0		0
Consumer Banking: | Other Modifications
Financing Receivable, Modified, Subsequent Default [Line Items]
Amount	0		0
Consumer Banking: | Other Modifications | Auto
Financing Receivable, Modified, Subsequent Default [Line Items]
Amount	0		0
Consumer Banking: | Other Modifications | Retail banking
Financing Receivable, Modified, Subsequent Default [Line Items]
Amount	0		0
Commercial Banking:
Financing Receivable, Modified, Subsequent Default [Line Items]
Amount	131		511
Commercial Banking: | Commercial and multifamily real estate
Financing Receivable, Modified, Subsequent Default [Line Items]
Amount	131		131
Commercial Banking: | Commercial and industrial
Financing Receivable, Modified, Subsequent Default [Line Items]
Amount	0		380
Commercial Banking: | Interest rate reduction
Financing Receivable, Modified, Subsequent Default [Line Items]
Amount	0	0	0	0
Commercial Banking: | Interest rate reduction | Commercial and multifamily real estate
Financing Receivable, Modified, Subsequent Default [Line Items]
Amount	0	0	0	0
Commercial Banking: | Interest rate reduction | Commercial and industrial
Financing Receivable, Modified, Subsequent Default [Line Items]
Amount	0	0	0	0
Commercial Banking: | Term Extension
Financing Receivable, Modified, Subsequent Default [Line Items]
Amount	103	97	228	97
Commercial Banking: | Term Extension | Commercial and multifamily real estate
Financing Receivable, Modified, Subsequent Default [Line Items]
Amount	103	46	103	46
Commercial Banking: | Term Extension | Commercial and industrial
Financing Receivable, Modified, Subsequent Default [Line Items]
Amount	0	51	125	51
Commercial Banking: | Interest Rate Reduction and Term Extension
Financing Receivable, Modified, Subsequent Default [Line Items]
Amount	0	0	0	0
Commercial Banking: | Interest Rate Reduction and Term Extension | 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 | Commercial and industrial
Financing Receivable, Modified, Subsequent Default [Line Items]
Amount	0	0	0	0
Commercial Banking: | Other Modifications
Financing Receivable, Modified, Subsequent Default [Line Items]
Amount	28	97	283	97
Commercial Banking: | Other Modifications | Commercial and multifamily real estate
Financing Receivable, Modified, Subsequent Default [Line Items]
Amount	28	46	28	46
Commercial Banking: | Other Modifications | Commercial and industrial
Financing Receivable, Modified, Subsequent Default [Line Items]
Amount	$ 0	$ 51	$ 255	$ 51

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