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Loans - Schedule of Debtor Troubled Debt Restructuring, Subsequent Periods (Details) - Entity Loan Modification Program - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2025	Mar. 31, 2024
Financing Receivable, Modified, Subsequent Default [Line Items]
Amount	$ 149	$ 265
Interest rate reduction
Financing Receivable, Modified, Subsequent Default [Line Items]
Amount	58	91
Term Extension
Financing Receivable, Modified, Subsequent Default [Line Items]
Amount	1	70
Interest Rate Reduction and Term Extension
Financing Receivable, Modified, Subsequent Default [Line Items]
Amount	86	104
Other Modifications
Financing Receivable, Modified, Subsequent Default [Line Items]
Amount	4
Credit Card:
Financing Receivable, Modified, Subsequent Default [Line Items]
Amount	59	92
Credit Card: | Interest rate reduction
Financing Receivable, Modified, Subsequent Default [Line Items]
Amount	58	91
Credit Card: | Term Extension
Financing Receivable, Modified, Subsequent Default [Line Items]
Amount	0	0
Credit Card: | Interest Rate Reduction and Term Extension
Financing Receivable, Modified, Subsequent Default [Line Items]
Amount	1	1
Credit Card: | Other Modifications
Financing Receivable, Modified, Subsequent Default [Line Items]
Amount	0
Credit Card: | Domestic credit card:
Financing Receivable, Modified, Subsequent Default [Line Items]
Amount	38	75
Credit Card: | Domestic credit card: | Interest rate reduction
Financing Receivable, Modified, Subsequent Default [Line Items]
Amount	37	74
Credit Card: | Domestic credit card: | Term Extension
Financing Receivable, Modified, Subsequent Default [Line Items]
Amount	0	0
Credit Card: | Domestic credit card: | Interest Rate Reduction and Term Extension
Financing Receivable, Modified, Subsequent Default [Line Items]
Amount	1	1
Credit Card: | Domestic credit card: | Other Modifications
Financing Receivable, Modified, Subsequent Default [Line Items]
Amount	0
Credit Card: | International card businesses:
Financing Receivable, Modified, Subsequent Default [Line Items]
Amount	21	17
Credit Card: | International card businesses: | Interest rate reduction
Financing Receivable, Modified, Subsequent Default [Line Items]
Amount	21	17
Credit Card: | International card businesses: | Term Extension
Financing Receivable, Modified, Subsequent Default [Line Items]
Amount	0	0
Credit Card: | International card businesses: | Interest Rate Reduction and Term Extension
Financing Receivable, Modified, Subsequent Default [Line Items]
Amount	0	0
Credit Card: | International card businesses: | Other Modifications
Financing Receivable, Modified, Subsequent Default [Line Items]
Amount	0
Consumer Banking:
Financing Receivable, Modified, Subsequent Default [Line Items]
Amount	86	106
Consumer Banking: | Auto
Financing Receivable, Modified, Subsequent Default [Line Items]
Amount	86	106
Consumer Banking: | Interest rate reduction
Financing Receivable, Modified, Subsequent Default [Line Items]
Amount	0	0
Consumer Banking: | Interest rate reduction | Auto
Financing Receivable, Modified, Subsequent Default [Line Items]
Amount	0	0
Consumer Banking: | Term Extension
Financing Receivable, Modified, Subsequent Default [Line Items]
Amount	1	3
Consumer Banking: | Term Extension | Auto
Financing Receivable, Modified, Subsequent Default [Line Items]
Amount	1	3
Consumer Banking: | Interest Rate Reduction and Term Extension
Financing Receivable, Modified, Subsequent Default [Line Items]
Amount	85	103
Consumer Banking: | Interest Rate Reduction and Term Extension | Auto
Financing Receivable, Modified, Subsequent Default [Line Items]
Amount	85	103
Consumer Banking: | Other Modifications
Financing Receivable, Modified, Subsequent Default [Line Items]
Amount	0
Consumer Banking: | Other Modifications | Auto
Financing Receivable, Modified, Subsequent Default [Line Items]
Amount	0
Commercial Banking:
Financing Receivable, Modified, Subsequent Default [Line Items]
Amount	4
Commercial Banking: | Commercial and multifamily real estate
Financing Receivable, Modified, Subsequent Default [Line Items]
Amount	4
Commercial Banking: | Commercial and industrial
Financing Receivable, Modified, Subsequent Default [Line Items]
Amount	0
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	0	67
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	0	67
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	4	67
Commercial Banking: | Other Modifications | Commercial and multifamily real estate
Financing Receivable, Modified, Subsequent Default [Line Items]
Amount	4	0
Commercial Banking: | Other Modifications | Commercial and industrial
Financing Receivable, Modified, Subsequent Default [Line Items]
Amount	$ 0	$ 67

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