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Fair Value Measures - Assets Measured at Fair Value on a Nonrecurring Basis (Details) - Nonrecurring - USD ($)
$ in Millions
Mar. 31, 2024
Dec. 31, 2023
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis    
Certain impaired loans $ 236 $ 197
Other assets 50 50
Total assets at fair value 286 247
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 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 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 236 197
Other assets 50 50
Total assets at fair value $ 286 $ 247