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Derivative Instruments (Narrative) (Detail) (USD $) | Jun. 30, 2013 | Dec. 31, 2012
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Derivative [Line Items] |  |  |  |
Maximum amount of future guarantee payments | $ 27,500,000,000 |  |  |
Insured derivatives ceded under reinsurance agreements | 72,000,000 |  |  |
Cash collateral posted to derivative counterparties | 223,000,000 |  | 285,000,000 |
Fair value of Credit Support Annex | 3,000,000 |  | 4,000,000 |
Amount of counterparty netting | 59,000,000 |  | 90,000,000 |
Derivative assets, after counterparty netting | 12,000,000 |  | 12,000,000 |
Other assets and derivative assets - VIEs, after counterparty netting and embedded reclass | 4,000,000 |  | 4,000,000 |
Counterparty netting | 59,000,000 |  | 90,000,000 |
Derivative liabilities, after counterparty netting and posting of cash collateral | 1,700,000,000 |  | 3,100,000,000 |
Derivative Liabilities [Member] |  |  |  |
Derivative [Line Items] |  |  |  |
Cash collateral posted to derivative counterparties | 151,000,000 |  | 203,000,000 |
Embedded derivative liabilities | 1,913,000,000 | [1] | 3,425,000,000 | [1]
Other Liabilities [Member] |  |  |  |
Derivative [Line Items] |  |  |  |
Cash collateral posted to derivative counterparties | 16,000,000 |  | 16,000,000 |
Other Assets [Member] |  |  |  |
Derivative [Line Items] |  |  |  |
Cash collateral posted to derivative counterparties | 56,000,000 |  | 66,000,000 |
Medium Term Notes And Other Investments [Member] |  |  |  |
Derivative [Line Items] |  |  |  |
Embedded derivative assets | 8,000,000 |  | 8,000,000 |
Embedded derivative liabilities | $ 30,000,000 |  | $ 36,000,000 |
[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 determinedby 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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