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Derivative Instruments (Change In Our Unrealized Gain On Derivative Instruments In Accumulated OCI) (Details) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Change in our unrealized gain on derivative instruments in accumulated OCI    
Balance as of beginning-of-year $ 5,673  
Income tax benefit (expense) 18 $ (16)
Balance as of end-of-period 3,004  
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
Change in foreign currency exchange rate adjustment 153 (14)
Change in DAC, VOBA, DSI and DFEL (53) 6
Income tax benefit (expense) (8) 10
Reclassification adjustment for gains (losses) included in net income (loss) 9 8
Associated amortization of DAC, VOBA, DSI and DFEL (6) (1)
Income tax benefit (expense) (1) (1)
Balance as of end-of-period 8 99
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 (383) (47)
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
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) (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 312 11
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) 11 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) $ 1 $ 1