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Closed Block (Information Regarding Policyholder Dividend Obligation) (Details)
$ in Millions
3 Months Ended
Mar. 31, 2021
USD ($)
Movement in Closed Block Dividend Obligation [Roll Forward]  
Balance, beginning $ 8,787
Impact from earnings allocable to policyholder dividend obligation 246
Change in net unrealized investment gains (losses) allocated to policyholder dividend obligation (2,623)
Balance, ending $ 6,410