v3.26.1
Separate accounts (Fair value of assets) (Details) - USD ($)
$ in Millions
Jun. 30, 2026
Dec. 31, 2025
Jun. 30, 2025
Fair Value, Separate Account Investment [Line Items]      
Separate account assets $ 7,471 $ 6,925 $ 6,481
Separate Account, Cash and Cash Equivalents      
Fair Value, Separate Account Investment [Line Items]      
Separate account assets 121   131
Mutual funds      
Fair Value, Separate Account Investment [Line Items]      
Separate account assets 7,284   6,268
Fixed maturities      
Fair Value, Separate Account Investment [Line Items]      
Separate account assets $ 66   $ 82