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Accounting For Income Taxes - Schedule of Deferred Income Tax Assets and Liabilities (Details) - USD ($)
$ in Millions
Dec. 31, 2024
Dec. 31, 2023
Deferred income tax assets:    
Regulatory liabilities $ 194 $ 192
Tax credits and net operating loss carryforwards 36 77
Provisions for pensions 16 19
Other 49 48
Total gross deferred income tax assets 295 336
Valuation allowances for deferred tax assets (8) (10)
Total deferred income tax assets after valuation allowances 287 326
Deferred income tax liabilities:    
Utility property, plant, and equipment 759 747
Regulatory assets 252 269
Other 27 28
Total deferred income tax liabilities 1,038 1,044
Net long-term deferred income tax liability $ 751 $ 718