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Derivative Instruments (Change In Our Unrealized Gain On Derivative Instruments In Accumulated OCI) (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Dec. 31, 2017
Change in our unrealized gain on derivative instruments in accumulated OCI          
Balance as of beginning-of-year     $ 3,230    
Income tax expense (benefit) $ 66 $ 122 134 $ 162  
Balance as of end-of-period 1,201   1,201    
Unrealized Gain (Loss) on Derivative Instruments [Member]          
Change in our unrealized gain on derivative instruments in accumulated OCI          
Balance as of beginning-of-year     (29) 49  
Cumulative effect from adoption of new accounting standards         $ (6)
Change in foreign currency exchange rate adjustment     50 (75)  
Change in DAC, VOBA, DSI and DFEL     4 (8)  
Income tax benefit (expense)     (29) 13  
Reclassification adjustment for gains (losses) included in net income (loss)     11 7  
Associated amortization of DAC, VOBA, DSI and DFEL     (1) (2)  
Income tax expense (benefit)     (2) (2)  
Balance as of end-of-period $ 69 $ 22 69 22  
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     106 1  
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]     2 2  
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]     (2) (9)  
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     (19) 45  
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]     $ 11 9  
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  
[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).