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Derivative Financial Instruments - Gross Positions without Impact of Master Netting Agreements (Detail) - USD ($) $ in Millions	Sep. 30, 2016	Dec. 31, 2015
Derivatives, Fair Value [Line Items]
Gross position, Assets	$ 949	$ 728
Cash collateral (held) pledged, Assets	(425)	(759)
Gross position, Liabilities	(1,318)	(1,515)
Cash collateral (held) pledged, Liabilities	407	466
Other Liabilities [Member]
Derivatives, Fair Value [Line Items]
Gross position, Liabilities	(1,318)	(1,515)
Impact of master netting agreements, Liabilities	19	50
Derivative values with impact of master netting agreements (as carried on balance sheet), Liabilities	(1,299)	(1,465)
Cash collateral (held) pledged, Liabilities	407	466
Net position, Liabilities	(892)	(999)
Other Assets [Member]
Derivatives, Fair Value [Line Items]
Gross position, Assets	949	728
Impact of master netting agreements, Assets	(19)	(50)
Derivative values with impact of master netting agreements (as carried on balance sheet), Assets	930	678
Cash collateral (held) pledged, Assets	(425)	(759)
Net position, Assets	$ 505	$ (81)

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