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Derivative Financial Instruments - Gross Positions without Impact of Master Netting Agreements (Detail) - USD ($) $ in Millions	Jun. 30, 2021	Dec. 31, 2020
Derivatives Fair Value [Line Items]
Derivative assets	$ 276	$ 357
Derivative values with impact of master netting agreements (as carried on balance sheet), Assets	246	307
Cash collateral (held) pledged, Assets	(285)	(336)
Derivative liabilities	(269)	(533)
Cash collateral (held) pledged, Liabilities	183	234
Other Assets [Member]
Derivatives Fair Value [Line Items]
Derivative assets	276	357
Impact of master netting agreements, Assets	(30)	(50)
Derivative values with impact of master netting agreements (as carried on balance sheet), Assets	246	307
Cash collateral (held) pledged, Assets	(285)	(336)
Net position, Assets	(39)	(29)
Other Liabilities [Member]
Derivatives Fair Value [Line Items]
Derivative liabilities	(269)	(533)
Impact of master netting agreements, Liabilities	30	50
Derivative values with impact of master netting agreements (as carried on balance sheet), Liabilities	(239)	(483)
Cash collateral (held) pledged, Liabilities	183	234
Net position, Liabilities	$ (56)	$ (249)

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