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Closed Block (Narrative) (Details) - USD ($)
$ in Millions
Mar. 31, 2021
Dec. 31, 2020
Closed Block Dividend Obligation $ 6,410 $ 8,787
Accumulated Distributions in Excess of Net Income    
Closed Block Dividend Obligation 3,166 2,920
Net Unrealized Investment Gains (Losses)    
Closed Block Dividend Obligation $ 3,244 $ 5,867