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Investments - Schedule of sources of net investment income (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2024
Sep. 30, 2023
Sep. 30, 2024
Sep. 30, 2023
Net Investment Income [Line Items]        
Investment income $ 206 $ 171 $ 603 $ 596
Equity in earnings of partnerships and similar investments 6 17 45 102
Investment expenses (6) (3) (17) (13)
Net investment income 200 168 586 583
Fixed maturities: | Net investment income        
Net Investment Income [Line Items]        
Investment income 136 126 406 369
Fixed maturities: | Net investment income        
Net Investment Income [Line Items]        
Change in fair value of fixed maturity securities 7 (11) 7 (1)
Equity securities | Net investment income        
Net Investment Income [Line Items]        
Dividends 6 8 20 26
Change in fair value of equity securities 20 7 45 36
Other        
Net Investment Income [Line Items]        
Investment income $ 31 $ 24 $ 80 $ 64