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Fair Value Measures - Assets Measured at Fair Value on a Nonrecurring Basis (Details) - USD ($)
$ in Millions
Sep. 30, 2024
Dec. 31, 2023
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis    
Loans held for sale $ 1,595 $ 902
Nonrecurring    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis    
Certain impaired loans 2,399 197
Loans held for sale 255  
Other assets 51 50
Total assets at fair value 2,705 247
Nonrecurring | 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
Loans held for sale 0  
Other assets 0 0
Total assets at fair value 0 0
Nonrecurring | Significant Other Observable Inputs (Level 2)    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis    
Certain impaired loans 0 0
Loans held for sale 255  
Other assets 0 0
Total assets at fair value 255 0
Nonrecurring | Significant Unobservable Inputs (Level 3)    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis    
Certain impaired loans 2,399 197
Loans held for sale 0  
Other assets 51 50
Total assets at fair value $ 2,450 $ 247