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Loans - Financing Receivable, Modified - Modification to Borrowers (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
Financing Receivable, Past Due [Line Items] |  |  |
Total loans modified | $ 2,748 | $ 2,860 |
% of total class of receivables | 0.84% | 0.89% |
Principal balance reduction |  |  | $ 2,252
Interest rate reduction |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Total loans modified | $ 693 | $ 687 |
Term Extension |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Total loans modified | 1,089 | 970 |
Principal balance reduction |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Total loans modified | 36 | 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 | 788 | 711 |
Other |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Total loans modified | 142 | 460 |
Credit Card: |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Total loans modified | $ 702 | $ 699 |
% of total class of receivables | 0.43% | 0.45% |
Principal balance reduction |  |  | 433
Credit Card: | Interest rate reduction |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Total loans modified | $ 693 | $ 687 |
Credit Card: | Term Extension |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Total loans modified | 0 | 0 |
Credit Card: | Principal balance reduction |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Total loans modified | 0 | 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 | 9 | 12 |
Credit Card: | Other |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Total loans modified | 0 | 0 |
Credit Card: | Domestic Card |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Total loans modified | $ 579 | $ 602 |
% of total class of receivables | 0.37% | 0.41% |
Credit Card: | Domestic Card | Interest rate reduction |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Total loans modified | $ 570 | $ 590 |
Weighted-average interest rate reduction | 20.12% | 19.32% |
Credit Card: | Domestic Card | Term Extension |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Total loans modified | $ 0 | $ 0 |
Payment delay duration (in months) | 12 months | 12 years |
Credit Card: | Domestic Card | Principal balance reduction |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Total loans modified | $ 0 | $ 0 |
Principal balance reduction | 0 | 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 | 9 | 12 |
Credit Card: | Domestic Card | Other |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Total loans modified | 0 | 0 |
Credit Card: | International card businesses |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Total loans modified | $ 123 | $ 97 |
% of total class of receivables | 1.79% | 1.41% |
Credit Card: | International card businesses | Interest rate reduction |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Total loans modified | $ 123 | $ 97 |
Weighted-average interest rate reduction | 26.71% | 27.10% |
Credit Card: | International card businesses | Term Extension |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Total loans modified | $ 0 | $ 0 |
Credit Card: | International card businesses | Principal balance reduction |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Total loans modified | 0 | 0 |
Principal balance reduction | 0 | 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 | 0 |
Credit Card: | International card businesses | Other |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Total loans modified | 0 | 0 |
Consumer Banking: |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Total loans modified | $ 728 | $ 772 |
% of total class of receivables | 0.93% | 1.02% |
Principal balance reduction |  |  | 1,077
Consumer Banking: | Interest rate reduction |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Total loans modified | $ 0 | $ 0 |
Consumer Banking: | Term Extension |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Total loans modified | 37 | 71 |
Consumer Banking: | Principal balance reduction |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Total loans modified | 21 | 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 | 665 | 673 |
Consumer Banking: | Other |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Total loans modified | 5 | 7 |
Consumer Banking: | Auto |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Total loans modified | $ 722 | $ 762 |
% of total class of receivables | 0.94% | 1.03% |
Principal balance reduction |  |  | 1,070
Consumer Banking: | Auto | Interest rate reduction |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Total loans modified | $ 0 | $ 0 |
Weighted-average interest rate reduction | 8.83% | 8.72% |
Consumer Banking: | Auto | Term Extension |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Total loans modified | $ 32 | $ 65 |
Payment delay duration (in months) | 6 months | 6 years |
Consumer Banking: | Auto | Principal balance reduction |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Total loans modified | $ 21 | $ 21 |
Principal balance reduction | 1 | 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 | 665 | 672 |
Consumer Banking: | Auto | Other |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Total loans modified | 4 | 4 |
Consumer Banking: | Retail banking |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Total loans modified | $ 6 | $ 10 |
% of total class of receivables | 0.48% | 0.74% |
Principal balance reduction |  |  | 7
Consumer Banking: | Retail banking | Interest rate reduction |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Total loans modified | $ 0 | $ 0 |
Weighted-average interest rate reduction | 3.48% | 2.00% |
Consumer Banking: | Retail banking | Term Extension |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Total loans modified | $ 5 | $ 6 |
Payment delay duration (in months) | 3 months | 10 years |
Consumer Banking: | Retail banking | Principal balance reduction |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Total loans modified | $ 0 | $ 0 |
Principal balance reduction | 0 | 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 | 0 | 1 |
Consumer Banking: | Retail banking | Other |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Total loans modified | 1 | 3 |
Commercial Banking: |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Total loans modified | $ 1,318 | $ 1,389 |
% of total class of receivables | 1.51% | 1.54% |
Principal balance reduction |  |  | 742
Commercial Banking: | Interest rate reduction |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Total loans modified | $ 0 | $ 0 |
Commercial Banking: | Term Extension |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Total loans modified | 1,052 | 899 |
Commercial Banking: | Principal balance reduction |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Total loans modified | 15 | 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 | 114 | 26 |
Commercial Banking: | Other |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Total loans modified | 137 | 453 |
Commercial Banking: | Commercial and multifamily real estate |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Total loans modified | $ 539 | $ 465 |
% of total class of receivables | 1.69% | 1.35% |
Principal balance reduction |  |  | 385
Commercial Banking: | Commercial and multifamily real estate | Interest rate reduction |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Total loans modified | $ 0 | $ 0 |
Weighted-average interest rate reduction | 0.79% | 0.00% |
Commercial Banking: | Commercial and multifamily real estate | Term Extension |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Total loans modified | $ 471 | $ 463 |
Payment delay duration (in months) | 10 months | 13 years |
Commercial Banking: | Commercial and multifamily real estate | Principal balance reduction |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Total loans modified | $ 0 | $ 0 |
Principal balance reduction | 0 | 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 | 0 |
Commercial Banking: | Commercial and multifamily real estate | Other |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Total loans modified | 68 | 2 |
Commercial Banking: | Commercial and industrial |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Total loans modified | $ 779 | $ 924 |
% of total class of receivables | 1.41% | 1.65% |
Principal balance reduction |  |  | $ 357
Commercial Banking: | Commercial and industrial | Interest rate reduction |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Total loans modified | $ 0 | $ 0 |
Weighted-average interest rate reduction | 1.90% | 0.25% |
Commercial Banking: | Commercial and industrial | Term Extension |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Total loans modified | $ 581 | $ 436 |
Payment delay duration (in months) | 16 months | 7 years |
Commercial Banking: | Commercial and industrial | Principal balance reduction |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Total loans modified | $ 15 | $ 0 |
Principal balance reduction | 15 | 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 | 114 | 26 |
Commercial Banking: | Commercial and industrial | Other |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Total loans modified | $ 69 | $ 451 |

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