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Fair Value Measures - Assets Measured at Fair Value on a Nonrecurring Basis (Details) - Nonrecurring - USD ($) $ in Millions | Dec. 31, 2023 | Dec. 31, 2022
--- | --- | ---
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis |  |
Certain impaired loans | $ 197 | $ 28
Other assets | 50 | 41
Total assets at fair value | 247 | 69
Quoted Prices in Active Markets for Identical Assets (Level 1) |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis |  |
Certain impaired loans | 0 | 0
Other assets | 0 | 0
Total assets at fair value | 0 |
Significant Other Observable Inputs (Level 2) |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis |  |
Certain impaired loans | 0 | 0
Other assets | 0 | 0
Total assets at fair value | 0 | 0
Significant Unobservable Inputs (Level 3) |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis |  |
Certain impaired loans | 197 | 28
Other assets | 50 | 41
Total assets at fair value | $ 247 | $ 69

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