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Investments and Derivative Instruments Level 4 Other-Than-Temporary Impairment Losses (Details) - USD ($) $ in Millions		3 Months Ended		6 Months Ended
		Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Other-Than-Temporary Impairment Losses [Line Items]
Other than Temporary Impairment Losses, Investments, Portion Recognized in Earnings, Net, Available-for-sale Securities		$ 7	$ 11	$ 30	$ 23
Other-Than-Temporary Impairment Losses [Roll Forward]
Balance as of beginning of period		(336)	(412)	(324)	(424)
Additions for credit impairments recognized on securities not previously impaired	[1]	(4)	0	(21)	(3)
Other than Temporary Impairment, Credit Losses Recognized in Earnings, Additions, Additional Credit Losses	[1]	1	1	2	1
Securities that matured or were sold during the period		35	6	36	10
Other than Temporary Impairment, Credit Losses Recognized in Earnings, Reductions, Change in Status		0	0	0	2
Securities due to an increase in expected cash flows		13	19	18	28
Balance as of end of period		(293)	(388)	(293)	(388)
Other than Temporary Impairment Losses, Investments, Portion Recognized in Earnings, Net, Held-to-maturity Securities		5	1	23	4
Other than Temporary Impairment Losses, Investments, Portion Recognized in Earnings, Net		7	11	30	23
Available-for-sale Securities [Member]
Other-Than-Temporary Impairment Losses [Line Items]
Other than Temporary Impairment Losses, Investments, Portion Recognized in Earnings, Net, Available-for-sale Securities		1	8	3	17
Equity Securities [Member]
Other-Than-Temporary Impairment Losses [Roll Forward]
Other than Temporary Impairment Losses, Investments, Portion Recognized in Earnings, Net		$ 1	$ 0	$ 4	$ 0
[1] These additions are included in the net OTTI losses recognized in earnings in the Condensed Consolidated Statements of Operations.

X

- Definition

This item represents an increase to the cumulative amount of credit losses recognized in earnings for an other than temporary impairment (OTTI) of a debt security held for which a previous OTTI was recognized and the investor does not intend to sell the debt security and it is not more likely than not that the investor will be required to sell the debt security before recovery of its amortized cost basis.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 50
-Paragraph 8
-Subparagraph (e)
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+ References

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The cumulative amount of credit losses recognized in earnings related to debt securities held for which a portion of an other than temporary impairment (OTTI) was recognized in other comprehensive income (a component of shareholders' equity).

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This item represents reductions in the cumulative amount of credit losses recognized in earnings for an other than temporary impairment (OTTI) of a debt security because of the sale of impaired securities during the period.

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