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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

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- 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. + References No definition available. + Details
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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- Definition Assertion that the amount of fair value hedge ineffectiveness is immaterial. + References No definition available. + Details
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- Details
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- Details
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- Details
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