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Loans - Schedule of Debtor Troubled Debt Restructuring, Subsequent Periods (Details) - Entity Loan Modification Program - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2024	Jun. 30, 2023	Jun. 30, 2024
Financing Receivable, Modified, Subsequent Default [Line Items]
Amount	$ 504	$ 95	$ 769
Interest rate reduction
Financing Receivable, Modified, Subsequent Default [Line Items]
Amount	71	41	162
Term Extension
Financing Receivable, Modified, Subsequent Default [Line Items]
Amount	61	3	131
Interest Rate Reduction and Term Extension
Financing Receivable, Modified, Subsequent Default [Line Items]
Amount	117	51	221
Other Modifications
Financing Receivable, Modified, Subsequent Default [Line Items]
Amount	255		255
Credit Card:
Financing Receivable, Modified, Subsequent Default [Line Items]
Amount	72	41	164
Credit Card: | Interest rate reduction
Financing Receivable, Modified, Subsequent Default [Line Items]
Amount	71	41	162
Credit Card: | Term Extension
Financing Receivable, Modified, Subsequent Default [Line Items]
Amount	0	0	0
Credit Card: | Interest Rate Reduction and Term Extension
Financing Receivable, Modified, Subsequent Default [Line Items]
Amount	1	0	2
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	54	37	129
Credit Card: | Domestic credit card: | Interest rate reduction
Financing Receivable, Modified, Subsequent Default [Line Items]
Amount	53	37	127
Credit Card: | Domestic credit card: | Term Extension
Financing Receivable, Modified, Subsequent Default [Line Items]
Amount	0	0	0
Credit Card: | Domestic credit card: | Interest Rate Reduction and Term Extension
Financing Receivable, Modified, Subsequent Default [Line Items]
Amount	1	0	2
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	18	4	35
Credit Card: | International card businesses: | Interest rate reduction
Financing Receivable, Modified, Subsequent Default [Line Items]
Amount	18	4	35
Credit Card: | International card businesses: | Term Extension
Financing Receivable, Modified, Subsequent Default [Line Items]
Amount	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
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	119	54	225
Consumer Banking: | Auto
Financing Receivable, Modified, Subsequent Default [Line Items]
Amount	118	54	224
Consumer Banking: | Retail banking
Financing Receivable, Modified, Subsequent Default [Line Items]
Amount	1		1
Consumer Banking: | Interest rate reduction
Financing Receivable, Modified, Subsequent Default [Line Items]
Amount	0	0	0
Consumer Banking: | Interest rate reduction | Auto
Financing Receivable, Modified, Subsequent Default [Line Items]
Amount	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	3	3	6
Consumer Banking: | Term Extension | Auto
Financing Receivable, Modified, Subsequent Default [Line Items]
Amount	2	3	5
Consumer Banking: | Term Extension | Retail banking
Financing Receivable, Modified, Subsequent Default [Line Items]
Amount	1		1
Consumer Banking: | Interest Rate Reduction and Term Extension
Financing Receivable, Modified, Subsequent Default [Line Items]
Amount	116	51	219
Consumer Banking: | Interest Rate Reduction and Term Extension | Auto
Financing Receivable, Modified, Subsequent Default [Line Items]
Amount	116	$ 51	219
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	313		380
Commercial Banking: | Commercial and multifamily real estate
Financing Receivable, Modified, Subsequent Default [Line Items]
Amount	0		0
Commercial Banking: | Commercial and industrial
Financing Receivable, Modified, Subsequent Default [Line Items]
Amount	313		380
Commercial Banking: | Interest rate reduction
Financing Receivable, Modified, Subsequent Default [Line Items]
Amount	0		0
Commercial Banking: | Interest rate reduction | Commercial and multifamily real estate
Financing Receivable, Modified, Subsequent Default [Line Items]
Amount	0		0
Commercial Banking: | Interest rate reduction | Commercial and industrial
Financing Receivable, Modified, Subsequent Default [Line Items]
Amount	0		0
Commercial Banking: | Term Extension
Financing Receivable, Modified, Subsequent Default [Line Items]
Amount	58		125
Commercial Banking: | Term Extension | Commercial and multifamily real estate
Financing Receivable, Modified, Subsequent Default [Line Items]
Amount	0		0
Commercial Banking: | Term Extension | Commercial and industrial
Financing Receivable, Modified, Subsequent Default [Line Items]
Amount	58		125
Commercial Banking: | Interest Rate Reduction and Term Extension
Financing Receivable, Modified, Subsequent Default [Line Items]
Amount	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
Commercial Banking: | Interest Rate Reduction and Term Extension | Commercial and industrial
Financing Receivable, Modified, Subsequent Default [Line Items]
Amount	0		0
Commercial Banking: | Other Modifications
Financing Receivable, Modified, Subsequent Default [Line Items]
Amount	255		255
Commercial Banking: | Other Modifications | Commercial and multifamily real estate
Financing Receivable, Modified, Subsequent Default [Line Items]
Amount	0		0
Commercial Banking: | Other Modifications | Commercial and industrial
Financing Receivable, Modified, Subsequent Default [Line Items]
Amount	$ 255		$ 255

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