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Derivative Instruments (Change In Our Unrealized Gain On Derivative Instruments In Accumulated OCI) (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Change in our unrealized gain on derivative instruments in accumulated OCI      
Balance as of beginning-of-year $ 1,566    
Income tax expense (benefit) (949) $ 266 $ 276
Balance as of end-of-period 3,230 1,566  
Unrealized Gain (Loss) on Derivative Instruments [Member]      
Change in our unrealized gain on derivative instruments in accumulated OCI      
Balance as of beginning-of-year 49 132 139
Change in foreign currency exchange rate adjustment (137) 96 48
Change in DAC, VOBA, DSI and DFEL 2 3 2
Income tax benefit (expense) 38 41 66
Reclassification adjustment for gains (losses) included in net income (loss) 13 14 (183)
Associated amortization of DAC, VOBA, DSI and DFEL (1) (1) 1
Income tax expense (benefit) (4) (5) 64
Balance as of end-of-period (29) 49 132
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 7 (205) (258)
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 5 (190)
Unrealized Gain (Loss) on Derivative Instruments [Member] | Cash Flow Hedges [Member] | Interest rate contracts [Member] | Interest and Debt Expense [Member]      
Change in our unrealized gain on derivative instruments in accumulated OCI      
Reclassification adjustment for gains (losses) included in net income (loss) [2] (18) (10) 1
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) [3]   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 20 (10) 17
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] 18 11 $ 6
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) [3] $ 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 interest and debt expense on our Consolidated Statements of Comprehensive Income (Loss).
[3] The OCI offset is reported within realized gain (loss) on our Consolidated Statements of Comprehensive Income (Loss).