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Derivative Instruments (Narrative) (Details) (USD $) | Mar. 31, 2012 | Dec. 31, 2011
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Derivative Instruments [Abstract] |  |
Maximum amount of future guarantee payments | $ 65,500,000,000 |
Insured derivatives ceded under reinsurance agreements | 713,000,000 |
Derivative assets, after counterparty netting | 463,000,000 | 459,000,000
Derivative assets and Derivative assets - VIEs, after counterparty netting | 457,000,000 | 452,000,000
Derivative liabilities, after counterparty netting | 5,700,000,000 | 6,000,000,000
Fair value of derivative liabilities reported in derivative liabilities and derivative liabilities VIEs Net of Counterparty | 5,600,000,000 |
Fair value of derivative assets, before counterparty netting | 539,000,000 | 552,000,000
Fair value of derivative liabilities, before counterparty netting | 5,700,000,000 | 6,100,000,000
Fair value of securities, posted to derivative counterparties | 435,000,000 | 470,000,000
Fair value of Credit Support Annex | $ 2,000,000 | $ 2,000,000

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- Definition Derivatives Ceded Under Reinsurance Agreements + References No definition available. + Details
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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 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Financial Accounting Standard (FAS) -Number 133 -Paragraph 44C -Subparagraph a -Clause 1 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009.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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