v3.25.4
Employee Retirement Benefits - Unrecognized Amounts (Details) - Pension Benefits [Member] - USD ($)
$ in Millions
Dec. 31, 2025
Dec. 31, 2024
Unrecognized Amounts Included In Regulatory Assets (Liabilities) [Abstract]    
Unrecognized prior service cost $ 3 $ 0
Unrecognized (gains) losses (5) 92
Total (2) 92
Components of AOCI:    
Unrecognized prior service benefit 0 1
Unrecognized gains (losses) 42 (12)
Total 42 (11)
Tax effects on components of AOCI [Abstract]    
Tax expense (benefit) related to unrecognized prior service benefit (cost)   1
Tax expense (benefit) related to unrecognized gain (loss) $ 14 $ (3)