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Derivative Instruments (Change In Unrealized Gain On Derivative Instruments In Accumulated OCI) (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2020
Jun. 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) $ 81 $ (20) (17) $ (4)
Balance as of end-of-period 7,815   7,815  
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     97 (5)
Change in DAC, VOBA, DSI and DFEL     (104) (4)
Income tax benefit (expense)     (88) (38)
Associated amortization of DAC, VOBA, DSI and DFEL     (7) (1)
Income tax benefit (expense)     (5) (4)
Balance as of end-of-period $ 488 $ 245 488 245
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     152 102
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     1 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     269 87
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     22 15
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     $ 8 $ 4