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Separate accounts (Fair Value of Assets) (Details) - USD ($)
$ in Millions
Sep. 30, 2023
Dec. 31, 2022
Fair Value, Separate Account Investment [Line Items]    
Separate account assets $ 5,306 $ 5,190
Separate Account, Cash and Cash Equivalents    
Fair Value, Separate Account Investment [Line Items]    
Separate account assets 88 141
Separate Account, equity securities and mutual funds    
Fair Value, Separate Account Investment [Line Items]    
Separate account assets 5,129 4,960
Separate Account, Non-U.S. Government Treasuries    
Fair Value, Separate Account Investment [Line Items]    
Separate account assets $ 89 $ 89