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Fair Value Measures - Assets Measured at Fair Value on a Nonrecurring Basis (Details) - Nonrecurring - USD ($) $ in Millions | Jun. 30, 2024 | Dec. 31, 2023
--- | --- | ---
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis |  |
Certain impaired loans | $ 1,951 | $ 197
Other assets | 52 | 50
Total assets at fair value | 2,003 | 247
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
Other assets |  | 0
Total assets at fair value | 0 | 0
Significant Other Observable Inputs (Level 2) |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis |  |
Certain impaired loans |  | 0
Other assets |  | 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 | 1,951 | 197
Other assets | 52 | 50
Total assets at fair value | $ 2,003 | $ 247

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