v3.26.1
Fair Value (Fair Value Option - Changes in Fair Value) (Details) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2026
Mar. 31, 2025
Loans held for sale | Residential mortgage loans held for sale    
Fair Value, Option, Quantitative Disclosures [Line Items]    
Gains (losses) - FVO: changes in fair value $ 7 $ (4)
Loans held for sale | Commercial mortgage loans held for sale    
Fair Value, Option, Quantitative Disclosures [Line Items]    
Gains (losses) - FVO: changes in fair value 16 11
Loans    
Fair Value, Option, Quantitative Disclosures [Line Items]    
Gains (losses) - FVO: changes in fair value 4 7
Other assets    
Fair Value, Option, Quantitative Disclosures [Line Items]    
Gains (losses) - FVO: changes in fair value 1 (9)
Interest-bearing deposits    
Fair Value, Option, Quantitative Disclosures [Line Items]    
Gains (losses) - FVO: changes in fair value 1 (1)
Other liabilities    
Fair Value, Option, Quantitative Disclosures [Line Items]    
Gains (losses) - FVO: changes in fair value $ 1 $ (7)