Fair value portion of probable future economic benefits obtained or controlled by an entity as a result of past transactions or events.

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 820

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (a)

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For each line item in the statement of financial position, the amounts of gains and losses from fair value changes included in earnings.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 825

-SubTopic 10

-Section 50

-Paragraph 30

-Subparagraph (a)

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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.

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Fair Value Measurements Level 4 Fair Value Option (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014	Dec. 31, 2014
Fair Value, Option, Quantitative Disclosures [Line Items]
Fair Value of Assets Accounted for Using Fair Value Option	$ 192,758		$ 192,758		$ 199,248
Fair Value, Option, Changes in Fair Value, Gain (Loss)	(4)	$ 9	0	$ 21
Corporate Debt Securities [Member]
Fair Value, Option, Quantitative Disclosures [Line Items]
Fair Value, Option, Changes in Fair Value, Gain (Loss)	(3)	2	(3)	4
Collateralized Debt Obligations [Member]
Fair Value, Option, Quantitative Disclosures [Line Items]
Fair Value, Option, Changes in Fair Value, Gain (Loss)	0	6	1	14
Foreign Government Debt Securities [Member]
Fair Value, Option, Quantitative Disclosures [Line Items]
Fair Value, Option, Changes in Fair Value, Gain (Loss)	(1)	1	(1)	2
Residential Mortgage Backed Securities [Member]
Fair Value, Option, Quantitative Disclosures [Line Items]
Fair Value, Option, Changes in Fair Value, Gain (Loss)	(1)	0	0	1
Fixed Maturities [Member]
Fair Value, Option, Quantitative Disclosures [Line Items]
Fair Value, Option, Changes in Fair Value, Gain (Loss)	(5)	9	(3)	21
Equity Securities [Member]
Fair Value, Option, Quantitative Disclosures [Line Items]
Fair Value, Option, Changes in Fair Value, Gain (Loss)	1	$ 0	3	$ 0
Equity Securities [Member]
Fair Value, Option, Quantitative Disclosures [Line Items]
Fair Value of Assets Accounted for Using Fair Value Option	0		0		348
Fixed Maturities [Member]
Fair Value, Option, Quantitative Disclosures [Line Items]
Fair Value of Assets Accounted for Using Fair Value Option	553		553		488
Fixed Maturities [Member] \| Asset-backed Securities [Member]
Fair Value, Option, Quantitative Disclosures [Line Items]
Fair Value of Assets Accounted for Using Fair Value Option	14		14		15
Fixed Maturities [Member] \| Corporate Debt Securities [Member]
Fair Value, Option, Quantitative Disclosures [Line Items]
Fair Value of Assets Accounted for Using Fair Value Option	93		93		133
Fixed Maturities [Member] \| Collateralized Debt Obligations [Member]
Fair Value, Option, Quantitative Disclosures [Line Items]
Fair Value of Assets Accounted for Using Fair Value Option	74		74		69
Fixed Maturities [Member] \| Commercial Mortgage Backed Securities [Member]
Fair Value, Option, Quantitative Disclosures [Line Items]
Fair Value of Assets Accounted for Using Fair Value Option	23		23		22
Fixed Maturities [Member] \| Foreign Government Debt Securities [Member]
Fair Value, Option, Quantitative Disclosures [Line Items]
Fair Value of Assets Accounted for Using Fair Value Option	36		36		30
Fixed Maturities [Member] \| Residential Mortgage Backed Securities [Member]
Fair Value, Option, Quantitative Disclosures [Line Items]
Fair Value of Assets Accounted for Using Fair Value Option	305		305		215
Fixed Maturities [Member] \| US Treasury Bond Securities [Member]
Fair Value, Option, Quantitative Disclosures [Line Items]
Fair Value of Assets Accounted for Using Fair Value Option	6		6		2
Fixed Maturities [Member] \| Municipal Bonds [Member]
Fair Value, Option, Quantitative Disclosures [Line Items]
Fair Value of Assets Accounted for Using Fair Value Option	$ 2		$ 2		$ 2