v3.26.1
Investments - Schedule of sources of net investment income (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2026
Jun. 30, 2025
Jun. 30, 2026
Jun. 30, 2025
Net Investment Income [Line Items]        
Equity in earnings (losses) of partnerships and similar investments, net $ 38 $ (6) $ 56 $ 7
Investment income 227 190 421 370
Investment expenses (6) (6) (13) (13)
Net investment income 221 184 408 357
Income Statement Location [Axis]: us-gaap:NetInvestmentIncome        
Net Investment Income [Line Items]        
Change in fair value of equity securities 2 4 (8) 4
Fixed maturities | Income Statement Location [Axis]: us-gaap:NetInvestmentIncome        
Net Investment Income [Line Items]        
Interest and amortization 148 141 293 281
Change in fair value of fixed maturities 0 7 0 2
Equity securities        
Net Investment Income [Line Items]        
Dividends 5 15 15 21
Cash and cash equivalents        
Net Investment Income [Line Items]        
Investment income 10 10 22 23
Mortgage loans        
Net Investment Income [Line Items]        
Investment income 14 11 26 20
Other        
Net Investment Income [Line Items]        
Investment income $ 10 $ 8 $ 17 $ 12