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Income Taxes - Schedule of Components of Net Deferred Tax Liability (Details) - USD ($)
$ in Millions
Dec. 31, 2025
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Deferred tax assets:        
Advances and contributions $ 519 $ 493    
Tax losses and credits 215 128    
Regulatory income tax assets 161 181    
Pension and other postretirement benefits 31 64    
Other 166 163    
Total deferred tax assets 1,092 1,029    
Valuation allowance (9) (8) $ (11) $ (11)
Total deferred tax assets, net of allowance 1,083 1,021    
Deferred tax liabilities:        
Property, plant and equipment 4,021 3,553    
Deferred pension and other postretirement benefits 75 86    
Other 157 244    
Total deferred tax liabilities 4,253 3,883    
Total deferred tax liabilities, net of deferred tax assets $ (3,170) $ (2,862)