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Investments - Schedule of sources of net investment income (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2024
Jun. 30, 2023
Jun. 30, 2024
Jun. 30, 2023
Net Investment Income [Line Items]        
Investment income $ 193 $ 203 $ 397 $ 425
Equity in earnings of partnerships and similar investments 14 28 39 85
Investment expenses (5) (5) (11) (10)
Net investment income 188 198 386 415
Fixed maturities: | Net investment income        
Net Investment Income [Line Items]        
Investment income 136 124 270 243
Fixed maturities: | Net investment income        
Net Investment Income [Line Items]        
Change in fair value of fixed maturity securities 0 7 0 10
Equity securities | Net investment income        
Net Investment Income [Line Items]        
Dividends 7 9 14 18
Change in fair value of equity securities 9 13 25 29
Other        
Net Investment Income [Line Items]        
Investment income $ 27 $ 22 $ 49 $ 40