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Derivative Instruments (Narrative) (Details) (USD $) | Dec. 31, 2011 | Dec. 31, 2010
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Derivative Instruments [Abstract] |  |  |  |
Maximum amount of future guarantee payments | $ 71,000,000,000 |  |  |
Derivatives ceded under reinsurance agreements and capital market transactions | 1,400,000,000 |  |  |
Fair value of derivative assets, before counterparty netting | 552,000,000 | [1] | 769,000,000 | [1]
Derivative assets, after counterparty netting | 459,000,000 |  | 708,000,000 |
Fair value of derivative liabilities, before counterparty netting | 6,100,000,000 |  | 6,800,000,000 |
Derivative assets and derivative assets - VIE after counterparty netting and embedded reclasses | 452,000,000 |  | 703,000,000 |
Derivative liabilities, after counterparty netting | 6,000,000,000 |  | 6,700,000,000 |
Fair value of securities posted to derivative counterparties | 470,000,000 |  | 452,000,000 |
Fair value of Credit Support Annexes | $ 2,000,000 |  | $ 4,000,000 |
[1] | In accordance with the accounting guidance for derivative instruments and hedging activities, the balance sheet location of the Company's embedded derivative instruments is determined by the location of the related host contract.

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- Definition Maximum potential amount of future payments (undiscounted) the guarantor could be required to make under the guarantee or each group of similar guarantees after (net of) reduction for potential recoveries under recourse or collateralization provisions. + References No definition available. + Details
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- Definition Fair value of liability associated with derivative asset, presented on a gross basis even when the derivative instrument is subject to master netting arrangements and qualifies for net presentation in the statement of financial position. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4B -Subparagraph (a),(c) -URI http://asc.fasb.org/extlink&oid=6935481&loc=SL5624163-113959 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 133 -Paragraph 44C -Subparagraph a -Clause 1 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009.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. Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 133 -Paragraph 205G -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. + Details
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