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Investments and Derivative Instruments Level 4 Fair Value Hedges (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended		12 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015	Dec. 31, 2015
Derivatives, Fair Value [Line Items]
Loss on Fair Value Hedge Ineffectiveness	1	1	1	1
JAPAN | Three Win Related Foreign Currency Swaps [Member]
Derivatives, Fair Value [Line Items]
Change in Unrealized Gain (Loss) on Hedged Item in Foreign Currency Fair Value Hedge			$ (108)
JAPAN | Fair Value Hedging [Member] | Three Win Related Foreign Currency Swaps [Member]
Derivatives, Fair Value [Line Items]
Change in Unrealized Gain (Loss) on Hedged Item in Foreign Currency Fair Value Hedge	$ (64)	$ 16			$ 16

X

- Definition

Amount of the increase (decrease) in fair value of the hedged item in a foreign currency fair value hedge which was recognized in earnings, net of offsets by the gain (loss) on the hedging instrument to the extent that the fair value hedge was determined to be effective.

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- Definition

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- Definition

Assertion that the amount of fair value hedge ineffectiveness is immaterial.

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