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Condensed Financial Information of Registrant - Condensed Statements of Comprehensive Income (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Condensed Financial Statements, Captions [Line Items]      
Net income $ 1,179 $ 1,091 $ 792
Other comprehensive income (loss):      
Unrealized investment income (loss) 33 102 (204)
Less: effect of income taxes 8 24 (49)
Other comprehensive income (loss), net of tax 25 78 (155)
Comprehensive income 1,204 1,169 637
Parent Company      
Condensed Financial Statements, Captions [Line Items]      
Net income 1,179 1,091 792
Other comprehensive income (loss):      
Unrealized investment income (loss) 33 102 (204)
Less: effect of income taxes 8 24 (49)
Other comprehensive income (loss), net of tax 25 78 (155)
Comprehensive income $ 1,204 $ 1,169 $ 637