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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, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Dec. 31, 2017
Change in our unrealized gain on derivative instruments in accumulated OCI          
Balance as of beginning-of-year     $ 659    
Income tax expense (benefit) $ 20 $ 75 4 $ 151  
Balance as of end-of-period 4,525   4,525    
Unrealized Gain (Loss) on Derivative Instruments [Member]          
Change in our unrealized gain on derivative instruments in accumulated OCI          
Balance as of beginning-of-year     119 27  
Cumulative effect from adoption of new accounting standards         $ 6
Change in foreign currency exchange rate adjustment     (5) 50  
Change in DAC, VOBA, DSI and DFEL     (4) (4)  
Income tax benefit (expense)     (38)    
Associated amortization of DAC, VOBA, DSI and DFEL     (1) (9)  
Income tax expense (benefit)     (4) (1)  
Balance as of end-of-period $ 245 $ 31 245 31  
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     102 (26)  
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 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     87 (19)  
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 [1]     15 $ 11  
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 [2]     $ 4    
[1] The OCI offset is reported within net investment income on our Consolidated Statements of Comprehensive Income (Loss).
[2] The OCI offset is reported within realized gain (loss) on our Consolidated Statements of Comprehensive Income (Loss).