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Derivative Financial Instruments - Gross Positions without Impact of Master Netting Agreements (Detail) - USD ($) $ in Millions | Jun. 30, 2016 | Dec. 31, 2015
--- | --- | ---
Derivatives, Fair Value [Line Items] |  |
Gross position, Assets | $ 1,109 | $ 728
Cash collateral (held) pledged, Assets | (451) | (759)
Gross position, Liabilities | (1,611) | (1,515)
Cash collateral (held) pledged, Liabilities | 511 | 466
Other Liabilities [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Gross position, Liabilities | (1,611) | (1,515)
Impact of master netting agreements, Liabilities | 26 | 50
Derivative values with impact of master netting agreements (as carried on balance sheet), Liabilities | (1,585) | (1,465)
Cash collateral (held) pledged, Liabilities | 511 | 466
Net position, Liabilities | (1,074) | (999)
Other Assets [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Gross position, Assets | 1,109 | 728
Impact of master netting agreements, Assets | (26) | (50)
Derivative values with impact of master netting agreements (as carried on balance sheet), Assets | 1,083 | 678
Cash collateral (held) pledged, Assets | (451) | (759)
Net position, Assets | $ 632 | $ (81)

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