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Derivative Instruments (Narrative) (Detail) - USD ($) $ in Millions | Mar. 31, 2016 | Dec. 31, 2015
--- | --- | ---
Derivative [Line Items] |  |
Maximum amount of future guarantee payments | $ 3,000 |
Cash collateral posted to derivative counterparties | 63 | $ 50
Securities posted as collateral to derivative counterparties | 288 | 259
Fair value of Credit Support Annex | 3 | 3
Amount of counterparty netting | 1 | 1
Derivative assets, after counterparty netting | 14 | 19
Other assets and other assets of consolidated VIEs, after counterparty netting and embedded reclass | 9 | 14
Counterparty netting | 1 | 1
Derivative liabilities, after counterparty netting and posting of cash collateral | 411 | 374
Derivative liabilities and derivative liabilities of consolidated VIEs, after counterparty netting and embedded reclass | 394 | 359
Derivative Liabilities [Member] |  |
Derivative [Line Items] |  |
Cash collateral posted to derivative counterparties | 44 | 31
Other Liabilities [Member] |  |
Derivative [Line Items] |  |
Cash collateral posted to derivative counterparties | 19 | 19
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 | 5 | 5
Total derivative liabilities | $ 17 | $ 15

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