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Investments - Major Sources of Interest and Investment Income (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Schedule of Investments [Line Items]      
Gross investment income $ 3,423 $ 2,864 $ 2,088
Investment expense (299) (257) (197)
Interest and investment income 3,124 2,607 1,891
Fixed maturity securities, available-for-sale      
Schedule of Investments [Line Items]      
Gross investment income 2,261 1,911 1,489
Equity securities      
Schedule of Investments [Line Items]      
Gross investment income 33 33 31
Preferred securities      
Schedule of Investments [Line Items]      
Gross investment income 34 52 67
Mortgage loans      
Schedule of Investments [Line Items]      
Gross investment income 273 229 186
Invested cash and short-term investments      
Schedule of Investments [Line Items]      
Gross investment income 238 151 61
Limited partnerships      
Schedule of Investments [Line Items]      
Gross investment income 326 231 110
Tax deferred property exchange income      
Schedule of Investments [Line Items]      
Gross investment income 133 166 103
Other investments      
Schedule of Investments [Line Items]      
Gross investment income $ 125 $ 91 $ 41