v3.26.1
Fair Value (Fair Value Option - Changes in Fair Value) (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2026
Jun. 30, 2025
Jun. 30, 2026
Jun. 30, 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 $ 11 $ (8) $ 18 $ (12)
Loans held for sale | Commercial mortgage loans held for sale        
Fair Value, Option, Quantitative Disclosures [Line Items]        
Gains (losses) - FVO: changes in fair value 9 18 25 29
Loans        
Fair Value, Option, Quantitative Disclosures [Line Items]        
Gains (losses) - FVO: changes in fair value 2 1 6 8
Other assets        
Fair Value, Option, Quantitative Disclosures [Line Items]        
Gains (losses) - FVO: changes in fair value 20 7 21 (2)
Interest-bearing deposits        
Fair Value, Option, Quantitative Disclosures [Line Items]        
Gains (losses) - FVO: changes in fair value 1 2 2 1
Other liabilities        
Fair Value, Option, Quantitative Disclosures [Line Items]        
Gains (losses) - FVO: changes in fair value $ (3) $ (4) $ (2) $ (11)