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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