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Separate Accounts (Aggregate FV of Assets Supporting Separate Accounts) (Details) - USD ($)
$ in Millions
Mar. 31, 2024
Dec. 31, 2023
Separate Account, Liability [Line Items]    
Separate account assets $ 90,332 $ 88,271
Equity securities    
Separate Account, Liability [Line Items]    
Separate account assets 90,065 87,999
Fixed maturity securities    
Separate Account, Liability [Line Items]    
Separate account assets 260 258
Cash and cash equivalents    
Separate Account, Liability [Line Items]    
Separate account assets 2 7
Other assets    
Separate Account, Liability [Line Items]    
Separate account assets $ 5 $ 7