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Closed Block (Information Regarding Policyholder Dividend Obligation) (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Movement in Closed Block Dividend Obligation [Roll Forward]    
Impact from earnings allocable to policyholder dividend obligation $ (334) $ (1,180)
Change in net unrealized investment gains (losses) allocated to policyholder dividend obligation 1,126 (6,847)
Balance, December 31 $ 792 $ 0