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Derivative Instruments (Narrative) (Detail) - USD ($) $ in Millions | Dec. 31, 2016 | Dec. 31, 2015
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Derivative [Line Items] |  |
Maximum amount of future guarantee payments | $ 637 |
Cash collateral posted to derivative counterparties | 1 | $ 50
Securities posted as collateral to derivative counterparties | 276 | 259
Fair value of Credit Support Annex | 3 | 3
Amount of counterparty netting (assets) | 0 | 1
Derivative assets, after counterparty netting | 25 | 19
Other assets and other assets of consolidated VIEs, after counterparty netting and embedded reclass | 23 | 14
Amount of counterparty netting (liabilities) | 1 | 1
Derivative liabilities, after counterparty netting and posting of cash collateral | 316 | 374
Derivative liabilities and derivative liabilities of consolidated VIEs, after counterparty netting and embedded reclass | 299 | 359
Derivative Liabilities [Member] |  |
Derivative [Line Items] |  |
Cash collateral posted to derivative counterparties | 0 | 31
Other Liabilities [Member] |  |
Derivative [Line Items] |  |
Cash collateral posted to derivative counterparties | 1 | 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 | 2 | 5
Embedded derivative liabilities | $ 17 | $ 15

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