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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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