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Loans - Trouble Debt Restructurings (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |
Principal balance reduction |  | $ 2,252 | $ 812
Commitments to lend on loans modified in TDRs | $ 109 |  |
Credit Card: |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |
Principal balance reduction |  | $ 433 | $ 277
Credit Card: | Interest rate reduction |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |
% of TDR Activity |  | 100.00% | 100.00%
Average Rate Reduction |  | 19.73% | 21.15%
Consumer Banking: |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |
Principal balance reduction |  | $ 1,077 | $ 374
Consumer Banking: | Interest rate reduction |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |
% of TDR Activity |  | 57.00% | 42.00%
Average Rate Reduction |  | 8.53% | 8.70%
Consumer Banking: | Term Extension |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |
% of TDR Activity |  | 97.00% | 93.00%
Average Term Extension (Months) |  | 4 months | 4 months
Consumer Banking: | Principal balance reduction |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |
% of TDR Activity |  |  | 0.00%
Gross Balance Reduction |  |  | $ 1
Consumer Banking: | Auto |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |
Principal balance reduction |  | $ 1,070 | $ 371
Consumer Banking: | Auto | Interest rate reduction |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |
% of TDR Activity |  | 57.00% | 43.00%
Average Rate Reduction |  | 8.53% | 8.72%
Commitments to lend on loans modified in TDRs |  | $ 219 | $ 168
Consumer Banking: | Auto | Term Extension |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |
% of TDR Activity |  | 97.00% | 93.00%
Average Term Extension (Months) |  | 4 months | 4 months
Consumer Banking: | Auto | Principal balance reduction |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |
Principal balance reduction | 1 |  |
% of TDR Activity |  |  | 0.00%
Gross Balance Reduction |  |  | $ 1
Consumer Banking: | Retail banking |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |
Principal balance reduction |  | $ 7 | $ 3
Consumer Banking: | Retail banking | Interest rate reduction |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |
% of TDR Activity |  |  | 13.00%
Average Rate Reduction |  |  | 2.94%
Consumer Banking: | Retail banking | Term Extension |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |
% of TDR Activity |  | 92.00% | 30.00%
Average Term Extension (Months) |  | 13 months | 42 months
Consumer Banking: | Retail banking | Principal balance reduction |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |
Principal balance reduction | 0 |  |
Commercial Banking: |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |
Principal balance reduction |  | $ 742 | $ 161
Commercial Banking: | Interest rate reduction |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |
% of TDR Activity |  | 4.00% | 6.00%
Average Rate Reduction |  | 0.28% | 1.19%
Commercial Banking: | Term Extension |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |
% of TDR Activity |  | 74.00% | 46.00%
Average Term Extension (Months) |  | 13 months | 9 months
Commercial Banking: | Commercial and multifamily real estate |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |
Principal balance reduction |  | $ 385 | $ 49
Commercial Banking: | Commercial and multifamily real estate | Interest rate reduction |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |
% of TDR Activity |  | 8.00% | 21.00%
Average Rate Reduction |  | 0.28% | 1.19%
Commercial Banking: | Commercial and multifamily real estate | Term Extension |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |
% of TDR Activity |  | 84.00% | 85.00%
Average Term Extension (Months) |  | 13 months | 11 months
Commercial Banking: | Commercial and multifamily real estate | Principal balance reduction |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |
Principal balance reduction | 20 |  |
Commercial Banking: | Commercial and industrial |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |
Principal balance reduction |  | $ 357 | $ 112
Commercial Banking: | Commercial and industrial | Term Extension |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |
% of TDR Activity |  | 64.00% | 30.00%
Average Term Extension (Months) |  | 13 months | 6 months
Commercial Banking: | Commercial and industrial | Principal balance reduction |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |
Principal balance reduction | $ 3 |  |
Domestic credit card: | Credit Card: |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |
Principal balance reduction |  | $ 306 | $ 154
Domestic credit card: | Credit Card: | Interest rate reduction |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |
% of TDR Activity |  | 100.00% | 100.00%
Average Rate Reduction |  | 16.54% | 15.90%
International card businesses: | Credit Card: |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |
Principal balance reduction |  | $ 127 | $ 123
International card businesses: | Credit Card: | Interest rate reduction |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |
% of TDR Activity |  | 100.00% | 100.00%
Average Rate Reduction |  | 27.42% | 27.70%

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