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Investments - Schedule of sources of net investment income (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Net Investment Income [Line Items]      
Investment income $ 758 $ 733 $ 742
Equity in earnings of partnerships and similar investments 99 267 321
Investment expenses (16) (16) (12)
Net investment income 742 717 730
Investment income      
Net Investment Income [Line Items]      
Change in fair value of equity securities 36 (2) 61
Fixed maturities | Investment income      
Net Investment Income [Line Items]      
Change in fair value of fixed maturities (3) 0 0
Fixed maturities | Investment income      
Net Investment Income [Line Items]      
Investment income 502 376 290
Other      
Net Investment Income [Line Items]      
Investment income 90 53 40
Investment income | Equity securities      
Net Investment Income [Line Items]      
Investment income $ 34 $ 39 $ 30