v3.26.3
Separate accounts (Fair value of assets) (Details) - USD ($)
$ in Millions
Sep. 30, 2026
Dec. 31, 2025
Sep. 30, 2025
Fair Value, Separate Account Investment [Line Items]      
Separate account assets $ 7,340 $ 6,925 $ 6,810
Separate Account, Cash and Cash Equivalents      
Fair Value, Separate Account Investment [Line Items]      
Separate account assets 133   103
Mutual funds      
Fair Value, Separate Account Investment [Line Items]      
Separate account assets 7,134   6,631
Fixed maturities      
Fair Value, Separate Account Investment [Line Items]      
Separate account assets $ 73   $ 76