v3.26.3
Accumulated Other Comprehensive Income (Loss) (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2026
Sep. 30, 2025
Sep. 30, 2026
Sep. 30, 2025
Jun. 30, 2026
Dec. 31, 2025
Jun. 30, 2025
Dec. 31, 2024
Accumulated Other Comprehensive Income (Loss) [Line Items]                
Stockholders' Equity Attributable to Parent $ 7,203 $ 7,139 $ 7,203 $ 7,139 $ 7,333 $ 7,360 $ 7,186 $ 7,004
Accumulated Defined Benefit Plans Adjustment                
Accumulated Other Comprehensive Income (Loss) [Line Items]                
Stockholders' Equity Attributable to Parent 5 (4) 5 (4) 6 6 (5) (5)
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent (1) 1 (1) 1        
Other Comprehensive Income (Loss), Defined Benefit Plan, Gain (Loss), Reclassification Adjustment from AOCI, before Tax (1) 1 (1) 1        
Accumulated Other Comprehensive Income/(Loss)                
Accumulated Other Comprehensive Income (Loss) [Line Items]                
Stockholders' Equity Attributable to Parent 146 87 146 87 195 146 47 63
Net change in fair value (48) 39 1 23        
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent (49) 40 0 24        
Other Comprehensive Income (Loss), Defined Benefit Plan, Gain (Loss), Reclassification Adjustment from AOCI, before Tax (1) 1 (1) 1        
Available-for-sale Securities | AOCI Unrealized gain/loss, Available-for-sale                
Accumulated Other Comprehensive Income (Loss) [Line Items]                
Stockholders' Equity Attributable to Parent 141 91 141 91 $ 189 $ 140 $ 52 $ 68
AFS Unrealized Gain/(Loss) on AFS Securities (48) 39 1 23        
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent $ (48) $ 39 $ 1 $ 23