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Loans - Financing Receivable, Modified - Modification to Borrowers (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Financing Receivable, Past Due [Line Items] |  |  |
Total loans modified | $ 2,860 |  |
% of total class of receivables | 0.89% |  |
Principal balance reduction |  | $ 2,252 | $ 812
Interest rate reduction |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Total loans modified | $ 687 |  |
Term Extension |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Total loans modified | 970 |  |
Principal balance reduction |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Total loans modified | 21 |  |
Principal balance reduction and term extension |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Total loans modified | 11 |  |
Interest Rate Reduction and Term Extension |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Total loans modified | 711 |  |
Other |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Total loans modified | 460 |  |
Credit Card: |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Total loans modified | $ 699 |  |
% of total class of receivables | 0.45% |  |
Principal balance reduction |  | 433 | 277
Credit Card: | Interest rate reduction |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Total loans modified | $ 687 |  |
Credit Card: | Term Extension |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Total loans modified | 0 |  |
Credit Card: | Principal balance reduction |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Total loans modified | 0 |  |
Credit Card: | Principal balance reduction and term extension |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Total loans modified | 0 |  |
Credit Card: | Interest Rate Reduction and Term Extension |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Total loans modified | 12 |  |
Credit Card: | Other |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Total loans modified | 0 |  |
Credit Card: | Domestic Card |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Total loans modified | $ 602 |  |
% of total class of receivables | 0.41% |  |
Credit Card: | Domestic Card | Interest rate reduction |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Weighted-average interest rate reduction | 19.32% |  |
Total loans modified | $ 590 |  |
Credit Card: | Domestic Card | Term Extension |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Payment delay duration (in months) | 12 years |  |
Total loans modified | $ 0 |  |
Credit Card: | Domestic Card | Principal balance reduction |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Total loans modified | 0 |  |
Principal balance reduction | 0 |  |
Credit Card: | Domestic Card | Principal balance reduction and term extension |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Total loans modified | 0 |  |
Credit Card: | Domestic Card | Interest Rate Reduction and Term Extension |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Total loans modified | 12 |  |
Credit Card: | Domestic Card | Other |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Total loans modified | 0 |  |
Credit Card: | International card businesses |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Total loans modified | $ 97 |  |
% of total class of receivables | 1.41% |  |
Credit Card: | International card businesses | Interest rate reduction |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Weighted-average interest rate reduction | 27.10% |  |
Total loans modified | $ 97 |  |
Credit Card: | International card businesses | Term Extension |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Total loans modified | 0 |  |
Credit Card: | International card businesses | Principal balance reduction |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Total loans modified | 0 |  |
Principal balance reduction | 0 |  |
Credit Card: | International card businesses | Principal balance reduction and term extension |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Total loans modified | 0 |  |
Credit Card: | International card businesses | Interest Rate Reduction and Term Extension |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Total loans modified | 0 |  |
Credit Card: | International card businesses | Other |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Total loans modified | 0 |  |
Consumer Banking: |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Total loans modified | $ 772 |  |
% of total class of receivables | 1.02% |  |
Principal balance reduction |  | 1,077 | 374
Consumer Banking: | Interest rate reduction |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Total loans modified | $ 0 |  |
Consumer Banking: | Term Extension |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Total loans modified | 71 |  |
Consumer Banking: | Principal balance reduction |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Total loans modified | 21 |  |
Consumer Banking: | Principal balance reduction and term extension |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Total loans modified | 0 |  |
Consumer Banking: | Interest Rate Reduction and Term Extension |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Total loans modified | 673 |  |
Consumer Banking: | Other |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Total loans modified | 7 |  |
Consumer Banking: | Auto |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Total loans modified | $ 762 |  |
% of total class of receivables | 1.03% |  |
Principal balance reduction |  | 1,070 | 371
Consumer Banking: | Auto | Interest rate reduction |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Weighted-average interest rate reduction | 8.72% |  |
Total loans modified | $ 0 |  |
Consumer Banking: | Auto | Term Extension |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Payment delay duration (in months) | 5 years 11 months 4 days |  |
Total loans modified | $ 65 |  |
Consumer Banking: | Auto | Principal balance reduction |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Total loans modified | 21 |  |
Principal balance reduction | 1 |  |
Consumer Banking: | Auto | Principal balance reduction and term extension |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Total loans modified | 0 |  |
Consumer Banking: | Auto | Interest Rate Reduction and Term Extension |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Total loans modified | 672 |  |
Consumer Banking: | Auto | Other |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Total loans modified | 4 |  |
Consumer Banking: | Retail banking |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Total loans modified | $ 10 |  |
% of total class of receivables | 0.74% |  |
Principal balance reduction |  | 7 | 3
Consumer Banking: | Retail banking | Interest rate reduction |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Weighted-average interest rate reduction | 2.00% |  |
Total loans modified | $ 0 |  |
Consumer Banking: | Retail banking | Term Extension |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Payment delay duration (in months) | 10 years 4 months 6 days |  |
Total loans modified | $ 6 |  |
Consumer Banking: | Retail banking | Principal balance reduction |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Total loans modified | 0 |  |
Principal balance reduction | 0 |  |
Consumer Banking: | Retail banking | Principal balance reduction and term extension |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Total loans modified | 0 |  |
Consumer Banking: | Retail banking | Interest Rate Reduction and Term Extension |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Total loans modified | 1 |  |
Consumer Banking: | Retail banking | Other |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Total loans modified | 3 |  |
Commercial Banking: |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Total loans modified | $ 1,389 |  |
% of total class of receivables | 1.54% |  |
Principal balance reduction |  | 742 | 161
Commercial Banking: | Interest rate reduction |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Total loans modified | $ 0 |  |
Commercial Banking: | Term Extension |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Total loans modified | 899 |  |
Commercial Banking: | Principal balance reduction |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Total loans modified | 0 |  |
Commercial Banking: | Principal balance reduction and term extension |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Total loans modified | 11 |  |
Commercial Banking: | Interest Rate Reduction and Term Extension |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Total loans modified | 26 |  |
Commercial Banking: | Other |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Total loans modified | 453 |  |
Commercial Banking: | Commercial and multifamily real estate |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Total loans modified | $ 465 |  |
% of total class of receivables | 1.35% |  |
Principal balance reduction |  | 385 | 49
Commercial Banking: | Commercial and multifamily real estate | Interest rate reduction |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Weighted-average interest rate reduction | 0.00% |  |
Total loans modified | $ 0 |  |
Commercial Banking: | Commercial and multifamily real estate | Term Extension |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Payment delay duration (in months) | 13 years 4 months 17 days |  |
Total loans modified | $ 463 |  |
Commercial Banking: | Commercial and multifamily real estate | Principal balance reduction |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Total loans modified | 0 |  |
Principal balance reduction | 20 |  |
Commercial Banking: | Commercial and multifamily real estate | Principal balance reduction and term extension |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Total loans modified | 0 |  |
Commercial Banking: | Commercial and multifamily real estate | Interest Rate Reduction and Term Extension |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Total loans modified | 0 |  |
Commercial Banking: | Commercial and multifamily real estate | Other |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Total loans modified | 2 |  |
Commercial Banking: | Commercial and industrial |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Total loans modified | $ 924 |  |
% of total class of receivables | 1.65% |  |
Principal balance reduction |  | $ 357 | $ 112
Commercial Banking: | Commercial and industrial | Interest rate reduction |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Weighted-average interest rate reduction | 0.25% |  |
Total loans modified | $ 0 |  |
Commercial Banking: | Commercial and industrial | Term Extension |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Payment delay duration (in months) | 6 years 9 months 14 days |  |
Total loans modified | $ 436 |  |
Commercial Banking: | Commercial and industrial | Principal balance reduction |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Total loans modified | 0 |  |
Principal balance reduction | 3 |  |
Commercial Banking: | Commercial and industrial | Principal balance reduction and term extension |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Total loans modified | 11 |  |
Commercial Banking: | Commercial and industrial | Interest Rate Reduction and Term Extension |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Total loans modified | 26 |  |
Commercial Banking: | Commercial and industrial | Other |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Total loans modified | $ 451 |  |

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