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Investments and Derivative Instruments Level 4 Fair Value Hedges (Details) - Gain (Loss) on Investments [Member] - Fair Value Hedging [Member] - Interest Rate Swap [Member] - Designated as Hedging Instrument [Member] - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
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Jun. 30, 2015 | Jun. 30, 2014 | [1] | Jun. 30, 2015 | Jun. 30, 2014
Derivatives, Fair Value [Line Items] |  |  |  |  |
Derivative Instruments Gain (Loss) Recognized in Income on Hedged Item Net | $ 0 |  | $ 0 | $ 0 | $ 0
Gain (Loss) on Fair Value Hedge Ineffectiveness, Net | $ 0 | [1] | $ (1) | $ 0 | $ (2)
[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.

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- Definition Amount of gain (loss)recognized in the income statement from the hedging ineffectiveness of a fair value hedge. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 25 -Section 50 -Paragraph 1 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=6886632&loc=d3e76258-113986 + Details
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- Definition Amount of unrealized gain (loss) included in earnings related to the fair value of the hedged item in an interest rate fair value hedge, offset by the gain (loss) on the hedging instrument to the extent that the fair value hedge is determined to be effective. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4C -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=56946850&loc=SL5624171-113959 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4A -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=56946850&loc=SL5618551-113959 + Details
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