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Insurance (Aggregate FV of Assets Supporting Separate Accounts) (Details) - USD ($)
$ in Millions
Mar. 31, 2023
Dec. 31, 2022
Separate Account, Liability [Line Items]    
Separate account assets $ 87,440 $ 84,965
Equity securities    
Separate Account, Liability [Line Items]    
Separate account assets 87,164 84,667
Fixed maturity securities    
Separate Account, Liability [Line Items]    
Separate account assets 260 278
Cash and cash equivalents    
Separate Account, Liability [Line Items]    
Separate account assets 9 9
Other    
Separate Account, Liability [Line Items]    
Separate account assets $ 7 $ 11