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Investments - Major Sources of Interest and Investment Income (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Schedule of Investments [Line Items]      
Gross investment income $ (2,864) $ (2,088) $ (2,128)
Investment expense (257) (197) (167)
Interest and investment income 2,607 1,891 1,961
Fixed maturity securities, available-for-sale      
Schedule of Investments [Line Items]      
Gross investment income (1,911) (1,489) (1,267)
Equity securities      
Schedule of Investments [Line Items]      
Gross investment income (33) (31) (23)
Preferred securities      
Schedule of Investments [Line Items]      
Gross investment income (52) (67) (63)
Mortgage loans      
Schedule of Investments [Line Items]      
Gross investment income (229) (186) (131)
Invested cash and short-term investments      
Schedule of Investments [Line Items]      
Gross investment income (151) (61) (7)
Limited partnerships      
Schedule of Investments [Line Items]      
Gross investment income (231) (110) (589)
Tax deferred property exchange income      
Schedule of Investments [Line Items]      
Gross investment income (166) (103) (16)
Other investments      
Schedule of Investments [Line Items]      
Gross investment income $ (91) $ (41) $ (32)