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Derivative Instruments (Narrative) (Detail) (USD $) | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2014 | Dec. 31, 2013
Derivative [Line Items] |  |  |  |
Maximum amount of future guarantee payments | $ 17,100,000,000 |  |  |
Insured derivatives ceded under reinsurance agreements | 48,000,000 |  |  |
Cash collateral posted to derivative counterparties | 115,000,000 |  | 160,000,000 |
Securities posted as collateral to derivative counterparties | 65,000,000 |  | 42,000,000 |
Number of credit support annexes | 1 |  | 1 |
Fair value of Credit Support Annex | 4,000,000 |  | 4,000,000 |
Amount of counterparty netting | 54,000,000 |  | 42,000,000 |
Derivative assets, after counterparty netting | 14,000,000 |  | 13,000,000 |
Other assets and other assets of consolidated VIEs, after counterparty netting and embedded reclass | 4,000,000 |  | 4,000,000 |
Counterparty netting | 54,000,000 |  | 42,000,000 |
Derivative liabilities, after counterparty netting and posting of cash collateral | 386,000,000 |  | 1,200,000,000 |
Derivative Liabilities [Member] |  |  |  |
Derivative [Line Items] |  |  |  |
Cash collateral posted to derivative counterparties | 99,000,000 |  | 123,000,000 |
Total derivative liabilities | 560,000,000 | [1] | 1,347,000,000 | [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 |  |  | 21,000,000 |
Medium Term Notes And Other Investments [Member] |  |  |  |
Derivative [Line Items] |  |  |  |
Embedded derivative assets | 10,000,000 |  | 9,000,000 |
Medium Term Notes And Other Investments [Member] | Embedded [Member] |  |  |  |
Derivative [Line Items] |  |  |  |
Total derivative liabilities | $ 21,000,000 |  | $ 19,000,000 |
[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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