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Schedule II - Condensed Statements of Comprehensive Income Parent Company (Detail) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Condensed Statement Of Income Captions [Line Items]      
Net income $ 1,249 $ 700 $ 710
Other comprehensive income (loss), net of tax:      
Unrealized (losses) gains on securities (143) 88 125
Foreign currency translation adjustment (1) 14 14
Pension benefit adjustment 12 (21) (20)
Total other comprehensive (loss) income, net of tax (132) 81 119
Comprehensive income 1,117 781 829
Less: Comprehensive income attributable to noncontrolling interests 8 4 3
Comprehensive income attributable to the Company 1,109 777 826
Parent Company      
Condensed Statement Of Income Captions [Line Items]      
Net income 1,249 700 710
Other comprehensive income (loss), net of tax:      
Unrealized (losses) gains on securities (143) 88 125
Foreign currency translation adjustment (1) 14 14
Pension benefit adjustment 12 (21) (20)
Total other comprehensive (loss) income, net of tax (132) 81 119
Comprehensive income 1,117 781 829
Less: Comprehensive income attributable to noncontrolling interests 8 4 3
Comprehensive income attributable to the Company $ 1,109 $ 777 $ 826