v3.25.4
Schedule I - Condensed Statements of Income And Comprehensive Income (Detail) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2025
Dec. 31, 2024
Dec. 31, 2023
Condensed Financial Statements, Captions      
Net income $ 1,360 $ 1,373 $ 1,358
Comprehensive Income (Loss), Net of Tax, Attributable to Parent, Total 1,455 1,202 1,218
Parent Company      
Condensed Financial Statements, Captions      
Equity in earnings of subsidiary 1,360 1,373 1,358
Net income 1,360 1,373 1,358
Equity in other comprehensive income (loss) of subsidiary, net of tax 95 (171) (140)
Comprehensive Income (Loss), Net of Tax, Attributable to Parent, Total $ 1,455 $ 1,202 $ 1,218