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Equity (Balance of and Changes in Each Component of AOCI) (Details) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Balance, Beginning of Period $ 5,359 $ 3,137
Other Comprehensive Income (Loss), before Reclassifications, before Tax (2,913) (2,613)
Reclassification from Accumulated Other Comprehensive Income, Current Period, before Tax (112) 142
Other Comprehensive Income (Loss), Tax (668) (464)
Balance, End of Period 3,002 1,130
Accumulated Translation Adjustment [Member]    
Balance, Beginning of Period (69) (92)
Other Comprehensive Income (Loss), before Reclassifications, before Tax 35 (112)
Reclassification from Accumulated Other Comprehensive Income, Current Period, before Tax 0 0
Other Comprehensive Income (Loss), Tax (5) (19)
Balance, End of Period (39) (223)
Accumulated Net Unrealized Investment Gain (Loss) [Member]    
Balance, Beginning of Period [1] 5,500 3,299
Other Comprehensive Income (Loss), before Reclassifications, before Tax [1] (2,947) (2,496)
Reclassification from Accumulated Other Comprehensive Income, Current Period, before Tax [1] (113) 141
Other Comprehensive Income (Loss), Tax [1] (673) (482)
Balance, End of Period [1] 3,113 1,426
Accumulated Defined Benefit Plans Adjustment [Member]    
Balance, Beginning of Period (72) (70)
Other Comprehensive Income (Loss), before Reclassifications, before Tax (1) (5)
Reclassification from Accumulated Other Comprehensive Income, Current Period, before Tax 1 1
Other Comprehensive Income (Loss), Tax 0 (1)
Balance, End of Period $ (72) $ (73)
[1] Includes cash flow hedges of $(71) and $(49) as of March 31, 2021 and December 31, 2020, respectively, and $(87) and $(26) as of March 31, 2020 and December 31, 2019, respectively. See Note 5 – “Derivative Instruments” for additional information on cash flow hedges.