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Income Taxes - Additional Information (Detail) - USD ($)
$ in Millions
9 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Jul. 04, 2025
Income Taxes [Line Items]      
Effective income tax rates for continuing operations 20.00% 24.30%  
Depreciation bonus percentage     100.00%
RETC Projects      
Income Taxes [Line Items]      
Investment proportional amortization, income tax expense $ 128    
Investment program, proportional amortization method, income tax credit 124    
Investment program, proportional amortization method, other income tax benefit 15    
Investment program, commitment amount 134    
Other commitment paid within next twelve months $ 125