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Investments - Schedule of sources of net investment income (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2023
Sep. 30, 2022
Sep. 30, 2023
Sep. 30, 2022
Net Investment Income [Line Items]        
Investment income $ 171 $ 155 $ 596 $ 562
Equity in earnings of partnerships and similar investments 17 37 102 246
Investment expenses (3) (4) (13) (13)
Net investment income 168 151 583 549
Fixed maturities: | Net investment income        
Net Investment Income [Line Items]        
Investment income 126 98 369 263
Fixed maturities: | Net investment income        
Net Investment Income [Line Items]        
Change in fair value (11) 0 (1) 0
Equity securities | Net investment income        
Net Investment Income [Line Items]        
Change in fair value of equity securities 7 (6) 36 (8)
Other        
Net Investment Income [Line Items]        
Investment income 24 17 64 37
Net investment income | Equity securities        
Net Investment Income [Line Items]        
Investment income $ 8 $ 9 $ 26 $ 24