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Derivative Financial Instruments - Gross Positions without Impact of Master Netting Agreements (Detail) - USD ($) $ in Millions | Mar. 31, 2017 | Dec. 31, 2016
--- | --- | ---
Derivatives, Fair Value [Line Items] |  |
Gross position, Assets | $ 471 | $ 565
Derivative values with impact of master netting agreements (as carried on balance sheet), Assets | 423 | 534
Cash collateral (held) pledged, Assets | (317) | (345)
Gross position, Liabilities | (1,540) | (1,701)
Cash collateral (held) pledged, Liabilities | 282 | 319
Other Liabilities [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Gross position, Liabilities | (1,540) | (1,701)
Impact of master netting agreements, Liabilities | 48 | 31
Derivative values with impact of master netting agreements (as carried on balance sheet), Liabilities | (1,492) | (1,670)
Cash collateral (held) pledged, Liabilities | 282 | 319
Net position, Liabilities | (1,210) | (1,351)
Other Assets [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Gross position, Assets | 471 | 565
Impact of master netting agreements, Assets | (48) | (31)
Derivative values with impact of master netting agreements (as carried on balance sheet), Assets | 423 | 534
Cash collateral (held) pledged, Assets | (317) | (345)
Net position, Assets | $ 106 | $ 189

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