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Loans - TDR - Subsequent Defaults (Details) $ in Millions	12 Months Ended
	Dec. 31, 2022 USD ($) contract
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of Contracts | contract	127,569
Amount | $	$ 523
Credit Card:
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of Contracts | contract	111,461
Amount | $	$ 154
Consumer Banking:
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of Contracts | contract	16,101
Amount | $	$ 286
Consumer Banking: | Auto
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of Contracts | contract	16,100
Amount | $	$ 285
Consumer Banking: | Retail banking
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of Contracts | contract	1
Amount | $	$ 1
Commercial Banking:
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of Contracts | contract	7
Amount | $	$ 83
Commercial Banking: | Commercial and multifamily real estate
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of Contracts | contract	2
Amount | $	$ 27
Commercial Banking: | Commercial and industrial
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of Contracts | contract	5
Amount | $	$ 56
Domestic credit card: | Credit Card:
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of Contracts | contract	37,029
Amount | $	$ 75
International card businesses: | Credit Card:
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of Contracts | contract	74,432
Amount | $	$ 79

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