Fair Value Measurements (Details Textual 1) (USD $)	12 Months Ended
Dec. 31, 2012	Dec. 31, 2011
Debt Instrument [Line Items]
Percentage difference of sale trade price from prior days price	3.00%
Percentage difference of purchase trade price from current days price	3.00%
Percentage change of monthly analyses Identify price	3.00%
Percentage difference of weekly analyses identify price from published bond	5.00%
Fair Value Measurements - Financial Instruments Excluding Guaranteed Living Benefits (Textual) [Abstract]
Cash collateral liability	$ 92,000,000	$ 1,400,000,000
Investment Sales Receivable	3,100,000,000	4,000,000,000
Derivatives priced by valuation models	98.00%	98.00%
Redemption notice period	90 days
Period on actual observed returns	10 years
Period for fund regression	3 years
Credit-linked notes [Member]
Debt Instrument [Line Items]
Outstanding principal balance of notes		243,000,000
Minimum [Member]
Debt Instrument [Line Items]
Percentage daily analyses to identify prices	3.00%
Maximum [Member]
Debt Instrument [Line Items]
Percentage daily analyses to identify prices	5.00%
US Treasury Securities [Member]
Debt Instrument [Line Items]
Transfers from level 1 to level 2	1,500,000,000
Fair Value, Inputs, Level 3 [Member] \| Alternative Assets [Member] \| Limited Partnerships and Other Alternative Investments [Member] \| Monthly N.A.V Calulation [Member]
Debt Instrument [Line Items]
Assets accounted for at fair value on a recurring basis	$ 150,000,000

Derivatives priced by valuation models.

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- Definition

Expected Return Assumption Valuation, Period for Fund Regression

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Expected Return Assumption Valuation, Period on Actual Observed Returns

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- Definition

Fair value measurement with unobservable inputs reconciliation recurring basis asset value based on inputs.

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No definition available.

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- Definition

Investment sales receivable.

+ References

No definition available.

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- Definition

Percentage change of monthly analyses identify price.

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Percentage Daily Analyses to Identify Prices

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- Definition

Percentage difference of purchase trade price from current days price.

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Percentage difference of sale trade price from prior days price.

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Percentage difference of weekly analyses identify price from published bond.

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Redemption Notice Period

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Including current and noncurrent portions, aggregate carrying amount of long-term borrowings as of the balance sheet date before deducting unamortized discount or premiums (if any). May include notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt, which had initial maturities beyond one year or beyond the normal operating cycle, if longer.

+ References

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

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 20

-Article 5

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

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-Topic 210

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-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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-Name Regulation S-X (SX)

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-Article 5

Reference 4: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 03

-Paragraph 16

-Article 9

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-Publisher FASB

-Name FASB Staff Position (FSP)

-Number APB14-1

-Paragraph 31

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-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

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- Definition

The amount as of the balance sheet date of the fair value of derivative liabilities that in accordance with the entity's accounting policy were offset against the right to reclaim cash collateral under a master netting arrangement.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 815

-SubTopic 10

-Section 50

-Paragraph 8

-Subparagraph (a)

-URI http://asc.fasb.org/extlink&oid=7476318&loc=d3e41678-113959

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-Name FASB Staff Position (FSP)

-Number FIN39-1

-Paragraph 10B

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-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

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- Definition

Amount of transfers of assets measured on a recurring basis out of Level 1 of the fair value hierarchy into Level 2.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 820

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (bb)

-URI http://asc.fasb.org/extlink&oid=7578670&loc=d3e19207-110258

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