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Commitments, Contingent Liabilities and Guarantees - Additional Information (Details) - USD ($) shares in Millions, $ in Millions | 3 Months Ended | 9 Months Ended |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
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Sep. 30, 2025 | Sep. 30, 2024 | Sep. 30, 2025 | Sep. 30, 2024 | Mar. 31, 2025 | Dec. 31, 2024 | Sep. 30, 2023 | Jun. 30, 2023 | Dec. 31, 2022 | Jun. 30, 2022 | Dec. 31, 2021 | Sep. 30, 2019 | Jun. 30, 2018 | Sep. 30, 2014 | Sep. 30, 2012 | Mar. 31, 2012 | Jun. 30, 2011 | Dec. 31, 2010 | Jun. 30, 2010 | Dec. 31, 2008
Loss Contingencies |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Margin account balance held by the brokerage clearing agent | $ 22 |  | $ 22 |  |  | $ 16 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Visa |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fair value of liability | 150 |  | 150 |  |  | 170 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Visa IPO, shares of Visa's Class B common stock received (in shares) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 10.1
Visa Class B shares carryover basis |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 0
Escrow deposit | 500 | $ 1,500 | 500 | $ 1,500 | $ 375 |  | $ 150 | $ 500 | $ 350 | $ 600 | $ 250 | $ 300 | $ 600 | $ 450 | $ 150 | $ 1,565 | $ 400 | $ 800 | $ 500 | $ 3,000
Residential mortgage loans |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fair value of liability | 8 |  | 8 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Make-whole payments | 0 | 0 | 0 | 0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Repurchased outstanding principal | 3 | 2 | 13 | 17 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Repurchase demand request | 10 | $ 8 | 27 | $ 36 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Outstanding repurchase demand inventory | 9 |  | 9 |  |  | 7 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Secured Debt |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fully and unconditionally guaranteed certain long-term borrowing obligations issued by wholly-owned issuing trust entities | 62 |  | 62 |  |  | 62 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Standby Letters of Credit |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Reserve for unfunded commitments | $ 8 |  | $ 8 |  |  | $ 12 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Standby letters of credit as a percentage of total letters of credit | 99.00% |  | 99.00% |  |  | 99.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |
Standby Letters of Credit | Secured Debt |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Standby letters of credit as a percentage of total letters of credit | 78.00% |  | 78.00% |  |  | 76.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |
Other Liabilities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Reserve for unfunded commitments | $ 151 |  | $ 151 |  |  | $ 134 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Other Liabilities | Residential mortgage loans |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Outstanding balances on residential mortgage loans sold with representation and warranty provisions | $ 5 |  | $ 5 |  |  | $ 5 |  |  |  |  |  |  |  |  |  |  |  |  |  |

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