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Derivative Instruments (Narrative) (Detail) (USD $) | 9 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2013 | Dec. 31, 2012
Derivative [Line Items] |  |  |  |
Maximum amount of future guarantee payments | $ 26,400,000,000 |  |  |
Insured derivatives ceded under reinsurance agreements | 67,000,000 |  |  |
Cash collateral posted to derivative counterparties | 219,000,000 |  | 285,000,000 |
Number of credit support annexes | 1 |  | 1 |
Fair value of Credit Support Annex | 4,000,000 |  | 4,000,000 |
Amount of counterparty netting | 53,000,000 |  | 90,000,000 |
Derivative assets, after counterparty netting | 13,000,000 |  | 12,000,000 |
Other assets and other assets of consolidated VIEs, after counterparty netting and embedded reclass | 4,000,000 |  | 4,000,000 |
Counterparty netting | 53,000,000 |  | 90,000,000 |
Derivative liabilities, after counterparty netting and posting of cash collateral | 1,400,000,000 |  | 3,100,000,000 |
Derivative Liabilities [Member] |  |  |  |
Derivative [Line Items] |  |  |  |
Cash collateral posted to derivative counterparties | 143,000,000 |  | 203,000,000 |
Embedded derivative liabilities | 1,597,000,000 | [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 | 60,000,000 |  | 66,000,000 |
Medium Term Notes And Other Investments [Member] |  |  |  |
Derivative [Line Items] |  |  |  |
Embedded derivative assets | 9,000,000 |  | 8,000,000 |
Embedded derivative liabilities | $ 16,000,000 |  | $ 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 Fair value of credit support annexes which define the terms or rules under which collateral is posted or transferred between swap counterparties to mitigate the credit risk arising from "in the money" derivative positions. + References No definition available. + Details
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