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Derivative Instruments (Narrative) (Detail) (USD $) | Sep. 30, 2012 | Dec. 31, 2011
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Derivative [Line Items] |  |  |  |
Maximum amount of future guarantee payments | $ 53,100,000,000 |  |  |
Insured derivatives ceded under reinsurance agreements | 393,000,000 |  |  |
Derivative assets, after counterparty netting | 12,000,000 |  | 459,000,000 |
Other Assets and Derivative Assets - VIEs, after counterparty netting and embedded reclass | 4,000,000 |  | 452,000,000 |
Derivative liabilities, after counterparty netting | 3,500,000,000 |  | 6,000,000,000 |
Fair value of derivative assets, before counterparty netting | 108,000,000 |  | 552,000,000 |
Derivative liabilities, before counterparty netting and posting of cash collateral | 3,900,000,000 |  | 6,108,000,000 |
Cash collateral posted derivative counterparties | 298,000,000 |  |  |
Fair value of securities, posted to derivative counterparties |  |  | 470,000,000 |
Fair value of Credit Support Annex | 3,000,000 |  | 2,000,000 |
Derivative Liabilities [Member] |  |  |  |
Derivative [Line Items] |  |  |  |
Derivative liabilities, before counterparty netting and posting of cash collateral | 3,853,000,000 | [1] | 6,108,000,000 | [1]
Cash collateral posted derivative counterparties | 215,000,000 |  |  |
Other Liabilities [Member] |  |  |  |
Derivative [Line Items] |  |  |  |
Cash collateral posted derivative counterparties | 17,000,000 |  |  |
Other Assets [Member] |  |  |  |
Derivative [Line Items] |  |  |  |
Cash collateral posted derivative counterparties | $ 66,000,000 |  |  |
[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 Derivatives Ceded Under Reinsurance Agreements + References No definition available. + Details
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- Definition The amount of the right to reclaim cash collateral under master netting arrangements that have not been offset against net derivative instrument positions. + 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 (b) -URI http://asc.fasb.org/extlink&oid=7476318&loc=d3e41678-113959 + 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 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. 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 Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4B -Subparagraph (a),(c) -URI http://asc.fasb.org/extlink&oid=7476318&loc=SL5624163-113959 + Details
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