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Derivative Financial Instruments - Gross Positions without Impact of Master Netting Agreements (Detail) - USD ($) $ in Millions	Jun. 30, 2019	Dec. 31, 2018
Derivatives Fair Value [Line Items]
Derivative assets	$ 246	$ 179
Derivative values with impact of master netting agreements (as carried on balance sheet), Assets	214	157
Cash collateral (held) pledged, Assets	(359)	(266)
Derivative liabilities	(731)	(801)
Cash collateral (held) pledged, Liabilities	164	188
Other Assets [Member]
Derivatives Fair Value [Line Items]
Derivative assets	246	179
Impact of master netting agreements, Assets	(32)	(22)
Derivative values with impact of master netting agreements (as carried on balance sheet), Assets	214	157
Cash collateral (held) pledged, Assets	(359)	(266)
Net position, Assets	(145)	(109)
Other Liabilities [Member]
Derivatives Fair Value [Line Items]
Derivative liabilities	(731)	(801)
Impact of master netting agreements, Liabilities	32	22
Derivative values with impact of master netting agreements (as carried on balance sheet), Liabilities	(699)	(779)
Cash collateral (held) pledged, Liabilities	164	188
Net position, Liabilities	$ (535)	$ (591)

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