v3.26.3
Investments - Schedule of sources of net investment income (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2026
Sep. 30, 2025
Sep. 30, 2026
Sep. 30, 2025
Net Investment Income [Line Items]        
Equity in earnings of partnerships and similar investments $ 45 $ 27 $ 101 $ 34
Investment income 362 211 783 581
Investment expenses (6) (6) (19) (19)
Net investment income 356 205 764 562
Income Statement Location [Axis]: us-gaap:NetInvestmentIncome        
Net Investment Income [Line Items]        
Change in fair value of equity securities (3) (6) (11) (2)
Fixed maturities | Income Statement Location [Axis]: us-gaap:NetInvestmentIncome        
Net Investment Income [Line Items]        
Interest and amortization 154 148 447 429
Change in fair value of fixed maturities 0 4 0 6
Equity securities        
Net Investment Income [Line Items]        
Dividends 9 6 24 27
Cash and cash equivalents        
Net Investment Income [Line Items]        
Investment income 11 14 33 37
Mortgage loans        
Net Investment Income [Line Items]        
Investment income 13 11 39 31
Charleston Harbor Resort & Marina        
Net Investment Income [Line Items]        
Investment income 126 0 126 0
Other        
Net Investment Income [Line Items]        
Investment income $ 7 $ 7 $ 24 $ 19