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Derivative Instruments (Change In Our Unrealized Gain On Derivative Instruments In Accumulated OCI) (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
Change in our unrealized gain on derivative instruments in accumulated OCI        
Balance as of beginning-of-year     $ 1,566  
Income tax expense (benefit) $ 92 $ 145 254 $ 260
Balance as of end-of-period 2,859   2,859  
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
Change in foreign currency exchange rate adjustment     (119) 42
Change in DAC, VOBA, DSI and DFEL     (3)
Income tax benefit (expense)     32 89
Reclassification adjustment for gains (losses) included in net income (loss)     7 12
Associated amortization of DAC, VOBA, DSI and DFEL     (1) (1)
Income tax expense (benefit)     (2) (4)
Balance as of end-of-period $ (14) $ (41) (14) (41)
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     (15) (319)
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]     3 4
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]     (13) (6)
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     46 22
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]     12 7
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]     $ 5 $ 6
[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).