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Derivatives - Narrative (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | ---
Sep. 30, 2024 | Sep. 30, 2023 | Sep. 30, 2024 | Sep. 30, 2023 | Dec. 31, 2023
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |  |
Collateral cash payables | $ 296 |  | $ 296 |  | $ 489
Total trading revenues | 38 | $ 19 | 113 | $ 68 |
Hedged amount of foreign currency denominated loans | 11 |  | 11 |  | 17
Additional Derivative Agreements | Derivative Instruments With Adjustable Collateral Posting Thresholds |  |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |  |
Net fair value of derivative assets with adjustable posting thresholds | 19 |  | 19 |  | 12
Net fair value of derivative liabilities with adjustable posting thresholds | 114 |  | 114 |  | 188
Collateral received | 95 |  | 95 |  | 95
Securities posted collateral | 48 |  | 48 |  | 83
Additional Derivative Agreements | Derivative Instruments With Accelerated Termination Provisions |  |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |  |
Net fair value of derivative assets with adjustable posting thresholds | 19 |  | 19 |  | 12
Net fair value of derivative liabilities with adjustable posting thresholds | 114 |  | 114 |  | 188
Collateral received | 95 |  | 95 |  | 95
Securities posted collateral | 48 |  | 48 |  | 83
Credit Risk Contract |  |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |  |
Derivative asset, notional amount | 326 |  | 326 |  | 351
Derivative liability, notional amount | 918 |  | 918 |  | 874
Visa Class B Shares |  |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |  |
Derivative liabilities related to sale | 32 |  | 32 |  | 23
Derivative valuation adjustment | 15 |  | 15 |  | 15
Counterparties |  |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |  |
Collateral cash receivables | 323 |  | 323 |  | 406
Collateral cash payables | $ 28 |  | $ 28 |  | $ 33

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