v3.26.1
Fair Value Measurement - Schedule of Assets Measured at Fair Value on a Nonrecurring Basis (Details) - USD ($)
$ in Millions
Jun. 30, 2026
Dec. 31, 2025
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis    
Total assets at fair value $ 16,794 $ 16,033
Quoted Prices in Active Markets for Identical Assets (Level 1)    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis    
Total assets at fair value 999 1,068
Significant Other Observable Inputs (Level 2)    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis    
Total assets at fair value 15,771 14,938
Significant Unobservable Inputs (Level 3)    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis    
Total assets at fair value 24 27
Nonrecurring    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis    
Loans held for investment 2,621 2,784
Loans held for sale:   24
Other assets 28 31
Total assets at fair value 2,649 2,839
Nonrecurring | Quoted Prices in Active Markets for Identical Assets (Level 1)    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis    
Loans held for investment 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    
Loans held for investment 0 0
Loans held for sale:   24
Other assets 0 0
Total assets at fair value 0 24
Nonrecurring | Significant Unobservable Inputs (Level 3)    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis    
Loans held for investment 2,621 2,784
Loans held for sale:   0
Other assets 28 31
Total assets at fair value $ 2,649 $ 2,815