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CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (LOSS) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2025
Dec. 31, 2024
Dec. 31, 2023
Statement of Comprehensive Income [Abstract]      
Net income $ 565 $ 465 $ 485
Debt securities available for sale:      
Unrealized gains (losses) arising during the period, net of tax expense (benefit) of $21, $4 and $16 76 14 57
Reclassification adjustment for (gains) losses included in net income, net of tax expense (benefit) of $0, $(7) and $(15) 0 27 52
Derivative instruments:      
Unrealized gains (losses) arising during the period, net of tax expense (benefit) of $3, $(4) and $(2) 10 (14) (8)
Reclassification adjustment for gains (losses) included in net income, net of tax expense (benefit) of $4, $9 and $5 15 32 19
Pension and postretirement benefit obligations:      
Unrealized gains (losses) arising during the period, net of tax expense (benefit) of $(1), $(2) and $(1) 5 7 2
Other Comprehensive Income (Loss) 106 66 122
Comprehensive Income (Loss) $ 671 $ 531 $ 607