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Derivative Instruments (Narrative) (Detail) $ in Millions | 9 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2015 USD ($) | Dec. 31, 2014 USD ($)
Derivative [Line Items] |  |
Maximum amount of future guarantee payments | $ 3,500 |
Cash collateral posted to derivative counterparties | 80 | $ 12
Securities posted as collateral to derivative counterparties | $ 245 | $ 198
Number of credit support annexes | 1 | 1
Fair value of Credit Support Annex | $ 3 | $ 2
Amount of counterparty netting | 1 | 81
Derivative assets, after counterparty netting | 15 | 10
Other assets and other assets of consolidated VIEs, after counterparty netting and embedded reclass | 9 | 2
Counterparty netting | 1 | 81
Derivative liabilities, after counterparty netting and posting of cash collateral | 411 | 456
Derivative liabilities and derivative liabilities of consolidated VIEs, after counterparty netting and embedded reclass | 396 | 437
Derivative Liabilities [Member] |  |
Derivative [Line Items] |  |
Cash collateral posted to derivative counterparties | 61 | 0
Other Liabilities [Member] |  |
Derivative [Line Items] |  |
Cash collateral posted to derivative counterparties | 19 | 12
Other Assets [Member] |  |
Derivative [Line Items] |  |
Cash collateral posted to derivative counterparties |  | 0
Medium Term Notes And Other Investments [Member] | Embedded [Member] |  |
Derivative [Line Items] |  |
Embedded derivative assets | 6 | 8
Total derivative liabilities | $ 15 | $ 19

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