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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, 2020
Dec. 31, 2019
Dec. 31, 2018
Change in our unrealized gain on derivative instruments in accumulated OCI      
Balance as of beginning-of-year $ 5,673    
Income tax benefit (expense) 76 $ (33) $ (244)
Balance as of end-of-period 8,931 5,673  
Unrealized Gain (Loss) on Derivative Instruments [Member]      
Change in our unrealized gain on derivative instruments in accumulated OCI      
Balance as of beginning-of-year (11) 139 (29)
Change in foreign currency exchange rate adjustment (174) (52) 111
Change in DAC, VOBA, DSI and DFEL (17) (4) (13)
Income tax benefit (expense) 94 31 (51)
Reclassification adjustment for gains (losses) included in net income (loss) 48 42 24
Associated amortization of DAC, VOBA, DSI and DFEL (1) (1) (2)
Income tax benefit (expense) (10) (9) (5)
Balance as of end-of-period (402) (11) 139
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 (350) (201) 100
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) 2 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) (16) (5) (7)
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 93 108 44
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) 56 35 27
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) $ 6 $ 9  
Cumulative Effect, Period of Adoption, Adjustment [Member]      
Change in our unrealized gain on derivative instruments in accumulated OCI      
Balance as of beginning-of-year     (6)
Cumulative Effect, Period of Adoption, Adjustment [Member] | Unrealized Gain (Loss) on Derivative Instruments [Member]      
Change in our unrealized gain on derivative instruments in accumulated OCI      
Balance as of beginning-of-year     $ (6)