Investments and Derivative Instruments Level 4 Derivative Collateral Arrangements (Details) - USD ($) $ in Millions	3 Months Ended
Jun. 30, 2016	Jun. 30, 2015	Dec. 31, 2015
Derivative Collateral Arrangements [Line Items]
Derivative, Notional Amount	$ 43,317		$ 46,241
Derivative, Fair Value, Net	(536)		(530)
Security Owned and Pledged as Collateral, Fair Value	39		173
Securities Received as Collateral	203		100
Fair Value of Securities Received as Collateral that Can be Resold or Repledged	203		100
Securities Received as Collateral, Amount Repledged and Sold	0	$ 0
Fixed Maturities [Member]
Derivative Collateral Arrangements [Line Items]
Security Owned and Pledged as Collateral, Fair Value	917		873
Equity Contract [Member]
Derivative Collateral Arrangements [Line Items]
Derivative, Notional Amount	748		404
Derivative, Fair Value, Net	0		15
UNITED STATES \| GMWB Hedging Instruments [Member]
Derivative Collateral Arrangements [Line Items]
Derivative, Notional Amount	10,532		10,979
Derivative, Fair Value, Net	203		158
UNITED STATES \| GMWB Hedging Instruments [Member] \| Other Contract [Member]
Derivative Collateral Arrangements [Line Items]
Derivative, Notional Amount	5,421		5,877
Derivative, Fair Value, Net	166		131
UNITED STATES \| GMWB Hedging Instruments [Member] \| Equity Contract [Member]
Derivative Collateral Arrangements [Line Items]
Derivative, Notional Amount	1,395		1,362
Derivative, Fair Value, Net	0		2
UNITED STATES \| GMWB Hedging Instruments [Member] \| Interest Rate Contract [Member]
Derivative Collateral Arrangements [Line Items]
Derivative, Notional Amount	3,716		3,740
Derivative, Fair Value, Net	$ 37		$ 25

Aggregate notional amount specified by the derivative(s). Expressed as an absolute value.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Article 12
-Section 13
-Sentence Column B

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- Definition

Fair value of the assets less the liabilities of a derivative or group of derivatives.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 45
-Paragraph 6
-URI http://asc.fasb.org/extlink&oid=6945355&loc=d3e41271-113958

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 45
-Paragraph 5
-URI http://asc.fasb.org/extlink&oid=6945355&loc=d3e41228-113958

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 825
-SubTopic 10
-Section 50
-Paragraph 10
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=49121117&loc=d3e13433-108611

Reference 4: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
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-Section 50
-Paragraph 15
-URI http://asc.fasb.org/extlink&oid=49121117&loc=d3e13495-108611

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- Definition

Fair value of collateral permitted, by contact or custom, to be sold or re-pledged.

+ References

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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.

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No definition available.

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The carrying value as of the balance sheet date of the assets received as collateral against securities loaned to other broker-dealers. Borrowers of securities generally are required to provide collateral to the lenders of securities, commonly cash but sometimes other securities or standby letters of credit, with a value slightly higher than that of the securities borrowed. In instances where the entity is permitted to sell or re-pledge these securities, the entity reports the fair value of the collateral received and the related obligation to return the collateral as a liability.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 860
-SubTopic 10
-Section 05
-Paragraph 17
-URI http://asc.fasb.org/extlink&oid=51812966&loc=d3e93645-111703

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
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The fair value of collateral received that has been sold or re-pledged and is owed to the debtor (transferor) upon settlement of the related contractual obligation under which it was received.

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- Definition

Fair value of financial instrument held by the entity for its own account (proprietary securities) for trading or investment purposes that are carried at fair value and pledged to counterparties as collateral for financing transactions.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 860
-SubTopic 30
-Section 50
-Paragraph 1A
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-URI http://asc.fasb.org/extlink&oid=55761124&loc=SL6224234-111729

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
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