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Investments and Derivative Instruments Level 4 Fair Value Hedges (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Fair Value Hedges [Line Items]      
Other than Temporary Impairment Losses, Investments, Portion Recognized in Earnings, Net $ 61 $ 29 $ 45
Fair Value Hedging [Member]      
Fair Value Hedges [Line Items]      
Gain (Loss) on Fair Value Hedge Ineffectiveness, Net [1] 0 (2) 26
Increase (Decrease) in Fair Value of Hedged Item in Interest Rate Fair Value Hedge [1] 0 4 (23)
Fair Value Hedging [Member] | Gain (Loss) on Investments [Member] | Interest Rate Swap [Member]      
Fair Value Hedges [Line Items]      
Gain (Loss) on Fair Value Hedge Ineffectiveness, Net [1] 0 (2) 27
Increase (Decrease) in Fair Value of Hedged Item in Interest Rate Fair Value Hedge [1] 0 4 (24)
Fair Value Hedging [Member] | Gain (Loss) on Investments [Member] | Currency Swap [Member]      
Fair Value Hedges [Line Items]      
Gain (Loss) on Fair Value Hedge Ineffectiveness, Net [1] 0 0 1
Increase (Decrease) in Fair Value of Hedged Item in Interest Rate Fair Value Hedge [1] 0 0 (1)
Fair Value Hedging [Member] | Benefits, losses and loss adjustment expenses [Member] | Currency Swap [Member]      
Fair Value Hedges [Line Items]      
Gain (Loss) on Fair Value Hedge Ineffectiveness, Net [1] 0 0 (2)
Increase (Decrease) in Fair Value of Hedged Item in Interest Rate Fair Value Hedge [1] 0 0 2
JAPAN | Three Win Related Foreign Currency Swaps [Member]      
Fair Value Hedges [Line Items]      
Change in Unrealized Gain (Loss) on Hedged Item in Foreign Currency Fair Value Hedge $ 4 116 250
JAPAN | Fixed Annuity Hedging Instruments [Member]      
Fair Value Hedges [Line Items]      
Change in Unrealized Gain (Loss) on Hedged Item in Foreign Currency Fair Value Hedge   $ (51) $ 324
[1] The amounts presented do not include the periodic net coupon settlements of the derivative or the coupon income (expense) related to the hedged item. The net of the amounts presented represents the ineffective portion of the hedge.