v3.25.1
Accumulated Other Comprehensive Loss (Details) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2025
Mar. 31, 2024
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Balance at beginning of period $ 12,489  
Total other comprehensive income (loss) 113 $ (108)
Balance at end of period 12,796 11,756
Accumulated other comprehensive loss    
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Balance at beginning of period (1,772) (1,926)
Total other comprehensive income (loss) 113 (108)
Balance at end of period (1,659) (2,034)
Unrealized gains (losses) on investment securities    
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Balance at beginning of period (1,732) (1,734)
Net unrealized gains (losses) arising during the period, net of tax 190 (106)
Reclassification adjustment for (gains) losses realized in net income (loss), net of tax (2) (2)
Amortization of net unrealized (gains) losses on securities transferred from available-for-sale to held-to-maturity realized in net income, net of tax 1 1
Total other comprehensive income (loss) 189 (107)
Balance at end of period (1,543) (1,841)
Tax on net unrealized gains (losses) arising during period 64 (36)
Tax on reclassification adjustment (less than) (1) (1)
Tax on amortization of net unrealized losses on securities transferred from available-for-sale to held-to-maturity realized in net income (loss) 1 1
Unrealized gains (losses) on fair value option liabilities attributable to our own credit spread    
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Balance at beginning of period 6 61
Net unrealized gains (losses) arising during the period, net of tax 3 (37)
Total other comprehensive income (loss) 3 (37)
Balance at end of period 9 24
Tax on net unrealized gains (losses) arising during period 1 (12)
Unrealized gains (losses) on derivatives designated as cash flow hedges    
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Balance at beginning of period (52) (260)
Net unrealized gains (losses) arising during the period, net of tax (87) 31
Reclassification adjustment for (gains) losses realized in net income (loss), net of tax 8 5
Total other comprehensive income (loss) (79) 36
Balance at end of period (131) (224)
Tax on net unrealized gains (losses) arising during period (28) 10
Tax on reclassification adjustment (less than) 2 2
Pension and postretirement benefit liability    
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Balance at beginning of period 6 7
Balance at end of period $ 6 $ 7