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Loans - TDR - Subsequent Defaults (Details) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2022 USD ($) contract | Dec. 31, 2021 USD ($) contract | Dec. 31, 2020 USD ($) contract
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |
Number of Contracts | contract | 127,569 | 86,472 | 96,905
Total Loans | $ | $ 523 | $ 428 | $ 414
Credit Card |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |
Number of Contracts | contract | 111,461 | 77,608 | 91,002
Total Loans | $ | $ 154 | $ 122 | $ 156
Consumer Banking |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |
Number of Contracts | contract | 16,101 | 8,856 | 5,887
Total Loans | $ | $ 286 | $ 136 | $ 78
Consumer Banking | Auto |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |
Number of Contracts | contract | 16,100 | 8,847 | 5,877
Total Loans | $ | $ 285 | $ 136 | $ 77
Consumer Banking | Retail banking |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |
Number of Contracts | contract | 1 | 9 | 10
Total Loans | $ | $ 1 | $ 0 | $ 1
Commercial Banking |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |
Number of Contracts | contract | 7 | 8 | 16
Total Loans | $ | $ 83 | $ 170 | $ 180
Commercial Banking | Commercial And Industrial [Member] |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |
Number of Contracts | contract | 5 | 7 | 15
Total Loans | $ | $ 56 | $ 120 | $ 130
Commercial Banking | Commercial and multifamily real estate |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |
Number of Contracts | contract | 2 | 1 | 1
Total Loans | $ | $ 27 | $ 50 | $ 50
Domestic credit card: | Credit Card |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |
Number of Contracts | contract | 37,029 | 18,694 | 32,639
Total Loans | $ | $ 75 | $ 35 | $ 69
International card businesses: | Credit Card |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |
Number of Contracts | contract | 74,432 | 58,914 | 58,363
Total Loans | $ | $ 79 | $ 87 | $ 87

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