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Derivative Instruments (Change In Unrealized Gain On Derivative Instruments In Accumulated OCI) (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Change in our unrealized gain on derivative instruments in accumulated OCI      
Balance as of beginning-of-year $ 3,327    
Income tax expense (benefit) 257 $ (1,287) $ 267
Balance as of end-of-year 659 3,327  
Unrealized Gain (Loss) on Derivative Instruments [Member]      
Change in our unrealized gain on derivative instruments in accumulated OCI      
Balance as of beginning-of-year 27 93 157
Cumulative effect from adoption of new accounting standard   6  
Change in foreign currency exchange rate adjustment 111 (137) 96
Change in DAC, VOBA, DSI and DFEL (14) 1 2
Income tax benefit (expense) (29) 26 27
Reclassification adjustment for gains (losses) included in net income (loss) 31 31 24
Associated amortization of DAC, VOBA, DSI and DFEL (3) (2) (2)
Income tax expense (benefit) (6) (10) (8)
Balance as of end-of-year 119 27 93
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 (4) 43 (165)
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      
Reclassification adjustment for gains (losses) included in net income (loss) [1] 4 4 5
Unrealized Gain (Loss) on Derivative Instruments [Member] | Cash Flow Hedges [Member] | Interest rate contracts [Member] | Realized Gain (Loss) [Member]      
Change in our unrealized gain on derivative instruments in accumulated OCI      
Reclassification adjustment for gains (losses) included in net income (loss) [2]     1
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 44 20 (10)
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      
Reclassification adjustment for gains (losses) included in net income (loss) [1] $ 27 18 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      
Reclassification adjustment for gains (losses) included in net income (loss) [2]   $ 9 $ 7
[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).