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Employee Benefits - Schedule of Accumulated Other Comprehensive Income and Regulatory Assets (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2025
Dec. 31, 2024
Pension Benefits    
Defined Benefit Plan Disclosure [Line Items]    
Net actuarial loss $ 289 $ 337
Prior service credit (2) (5)
Net amount recognized 287 332
Regulatory assets (liabilities) 261 304
Accumulated other comprehensive income 26 28
Other Benefits    
Defined Benefit Plan Disclosure [Line Items]    
Net actuarial loss 9 13
Prior service credit (52) (84)
Net amount recognized (43) (71)
Regulatory assets (liabilities) (43) (71)
Accumulated other comprehensive income $ 0 $ 0