Loans - TDR - Subsequent Defaults (Details) $ in Millions	12 Months Ended
	Dec. 31, 2022 USD ($) contract	Dec. 31, 2021 USD ($) contract
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of Contracts | contract	127,569	86,472
Amount | $	$ 523	$ 428
Credit Card:
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of Contracts | contract	111,461	77,608
Amount | $	$ 154	$ 122
Consumer Banking:
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of Contracts | contract	16,101	8,856
Amount | $	$ 286	$ 136
Consumer Banking: | Auto
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of Contracts | contract	16,100	8,847
Amount | $	$ 285	$ 136
Consumer Banking: | Retail banking
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of Contracts | contract	1	9
Amount | $	$ 1	$ 0
Commercial Banking:
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of Contracts | contract	7	8
Amount | $	$ 83	$ 170
Commercial Banking: | Commercial and industrial
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of Contracts | contract	5	7
Amount | $	$ 56	$ 120
Commercial Banking: | Commercial and multifamily real estate
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of Contracts | contract	2	1
Amount | $	$ 27	$ 50
Domestic credit card: | Credit Card:
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of Contracts | contract	37,029	18,694
Amount | $	$ 75	$ 35
International card businesses: | Credit Card:
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of Contracts | contract	74,432	58,914
Amount | $	$ 79	$ 87