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Derivative Instruments (Narrative) (Detail) (USD $) | Dec. 31, 2012 | Dec. 31, 2011
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Derivative [Line Items] |  |  |  |
Maximum amount of future guarantee payments | $ 50,900,000,000 |  |  |
Insured derivatives ceded under reinsurance agreements | 392,000,000 |  |  |
Cash collateral posted derivative counterparties | 285,000,000 |  |  |
Fair value of securities, posted to derivative counterparties |  |  | 470,000,000 |
Fair value of Credit Support Annex | 4,000,000 |  | 2,000,000 |
Amount of Counterparty netting | 90,000,000 |  | 93,000,000 |
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 |
Counterparty netting | 90,000,000 |  | 93,000,000 |
Derivative liabilities, after counterparty netting and posting of cash collateral | 3,100,000,000 |  | 6,000,000,000 |
Derivative Liabilities [Member] |  |  |  |
Derivative [Line Items] |  |  |  |
Cash collateral posted derivative counterparties | 203,000,000 |  |  |
Fair value of derivative liabilities, before counterparty netting and posting of Cash Collateral | 3,425,000,000 | [1] | 6,108,000,000 | [2]
Other Liabilities [Member] |  |  |  |
Derivative [Line Items] |  |  |  |
Cash collateral posted derivative counterparties | 16,000,000 |  |  |
Other Assets [Member] |  |  |  |
Derivative [Line Items] |  |  |  |
Cash collateral posted derivative counterparties | 66,000,000 |  |  |
Medium-Term Notes And Other Investments [Member] |  |  |  |
Derivative [Line Items] |  |  |  |
Embedded Derivative Assets | 8,000,000 |  | 7,000,000 |
Fair value of derivative liabilities, before counterparty netting and posting of Cash Collateral | $ 36,000,000 |  | $ 26,000,000 |
[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.
[2] | 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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