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Derivative Instruments (Narrative) (Detail) (USD $) | 9 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2014 | Dec. 31, 2013
Derivative [Line Items] |  |
Maximum amount of future guarantee payments | $ 11,700,000,000 |
Insured derivatives ceded under reinsurance agreements | 27,000,000 |
Cash collateral posted to derivative counterparties | 60,000,000 | 160,000,000
Securities posted as collateral to derivative counterparties | 123,000,000 | 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 | 65,000,000 | 42,000,000
Derivative assets, after counterparty netting | 12,000,000 | 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 | 65,000,000 | 42,000,000
Derivative liabilities, after counterparty netting and posting of cash collateral | 435,000,000 | 1,200,000,000
Derivative Liabilities [Member] |  |
Derivative [Line Items] |  |
Cash collateral posted to derivative counterparties | 44,000,000 | 123,000,000
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] | Embedded [Member] |  |
Derivative [Line Items] |  |
Embedded derivative assets | 8,000,000 | 9,000,000
Total derivative liabilities | $ 23,000,000 | $ 19,000,000

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