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Derivative Instruments (Change In Unrealized Gain On Derivative Instruments In Accumulated OCI) (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2020
Sep. 30, 2019
Change in our unrealized gain on derivative instruments in accumulated OCI        
Balance as of beginning-of-year     $ 5,836  
Income tax benefit (expense) $ 131 $ 98 114 $ 96
Balance as of end-of-period 8,175   8,175  
Unrealized Gain (Loss) on Derivative Instruments [Member]        
Change in our unrealized gain on derivative instruments in accumulated OCI        
Balance as of beginning-of-year     181 119
Change in foreign currency exchange rate adjustment     (16) 80
Change in DAC, VOBA, DSI and DFEL     (70) (3)
Income tax benefit (expense)     (43) (77)
Associated amortization of DAC, VOBA, DSI and DFEL     (14) (1)
Income tax benefit (expense)     (8) (7)
Balance as of end-of-period $ 308 $ 378 308 378
Unrealized Gain (Loss) on Derivative Instruments [Member] | Cash Flow Hedges [Member] | Interest rate contracts [Member]        
Change in our unrealized gain on derivative instruments in accumulated OCI        
Unrealized holding gains (losses) arising during the period     75 173
Unrealized Gain (Loss) on Derivative Instruments [Member] | Cash Flow Hedges [Member] | Interest rate contracts [Member] | Net Investment Income [Member]        
Change in our unrealized gain on derivative instruments in accumulated OCI        
Transfers from derivative instruments to bonds through basis adjustment     2 2
Unrealized Gain (Loss) on Derivative Instruments [Member] | Cash Flow Hedges [Member] | Foreign currency contracts [Member]        
Change in our unrealized gain on derivative instruments in accumulated OCI        
Unrealized holding gains (losses) arising during the period     213 114
Unrealized Gain (Loss) on Derivative Instruments [Member] | Cash Flow Hedges [Member] | Foreign currency contracts [Member] | Net Investment Income [Member]        
Change in our unrealized gain on derivative instruments in accumulated OCI        
Transfers from derivative instruments to bonds through basis adjustment     46 25
Unrealized Gain (Loss) on Derivative Instruments [Member] | Cash Flow Hedges [Member] | Foreign currency contracts [Member] | Realized Gain (Loss) [Member]        
Change in our unrealized gain on derivative instruments in accumulated OCI        
Transfers from derivative instruments to bonds through basis adjustment     $ 6 $ 9