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Investments - Schedule of sources of net investment income (Details) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2024
Mar. 31, 2023
Net Investment Income [Line Items]    
Investment income $ 204 $ 222
Equity in earnings of partnerships and similar investments 25 57
Investment expenses (6) (5)
Net investment income 198 217
Fixed maturities: | Net investment income    
Net Investment Income [Line Items]    
Investment income 134 119
Fixed maturities: | Net investment income    
Net Investment Income [Line Items]    
Change in fair value 0 3
Equity securities | Net investment income    
Net Investment Income [Line Items]    
Change in fair value of equity securities 16 16
Other    
Net Investment Income [Line Items]    
Investment income 22 18
Net investment income | Equity securities    
Net Investment Income [Line Items]    
Investment income $ 7 $ 9