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Accumulated Other Comprehensive Income (Loss) (After-tax Changes by Component) (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2025
Dec. 31, 2024
Dec. 31, 2023
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Balance at beginning of year $ (184) $ (163) $ (124)
Amounts arising during the year (20) (21) (40)
Reclassifications from AOCI 2 0 1
Net OCI during the year (18) (21) (39)
Balance at end of year (202) (184) (163)
Other Comprehensive Income (Loss), Equity Investees' AOCI, before Reclassifications, Net of Tax (1) 1 1
Other Comprehensive Income (Loss), Equity Investees' AOCI, Reclassification, After Tax 0 0 0
Accumulated Gain (Loss), Net, Cash Flow Hedge, Parent      
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Balance at beginning of year 9 6 3
Net OCI during the year 3 3 3
Balance at end of year 12 9 6
Accumulated Other Comprehensive Income, Equity Method Investment      
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Balance at beginning of year 4 3 2
Net OCI during the year (1) 1 1
Balance at end of year 3 4 3
Accumulated Defined Benefit Plans Adjustment, Net Prior Service Attributable to Parent      
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Balance at beginning of year (3) (4) (5)
Net OCI during the year 1 1 1
Balance at end of year (2) (3) (4)
Accumulated Defined Benefit Plans Adjustment, Net Gain (Loss) Attributable to Parent      
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Balance at beginning of year (194) (168) (124)
Net OCI during the year (21) (26) (44)
Balance at end of year $ (215) $ (194) $ (168)