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Condensed Financial Information of Registrant - Condensed Statements of Comprehensive Income (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Condensed Financial Statements, Captions [Line Items]      
Net income $ 1,091 $ 792 $ 659
Other comprehensive income (loss):      
Unrealized investment income (loss) 102 (204) (55)
Less: effect of income taxes 24 (49) (13)
Other comprehensive income (loss), net of tax 78 (155) (42)
Comprehensive income 1,169 637 617
Parent Company      
Condensed Financial Statements, Captions [Line Items]      
Net income 1,091 792 659
Other comprehensive income (loss):      
Unrealized investment income (loss) 102 (204) (55)
Less: effect of income taxes 24 (49) (13)
Other comprehensive income (loss), net of tax 78 (155) (42)
Comprehensive income $ 1,169 $ 637 $ 617