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Derivative Financial Instruments - Impact of Derivatives on Balance Sheet (Detail) - USD ($) $ in Millions	Jun. 30, 2021	Dec. 31, 2020
Derivative Assets:
Derivative assets	$ 276	$ 357
Derivative Liabilities:
Derivative liabilities	(269)	(533)
Net total derivatives	7	(176)
Designated as Hedging Instrument [Member] | Fair Value [Member]
Derivative Assets:
Derivative assets	273	351
Derivative Liabilities:
Derivative liabilities	(121)	(322)
Net total derivatives	152	29
Trading [Member]
Derivative Assets:
Derivative assets	3	6
Derivative Liabilities:
Derivative liabilities	(148)	(211)
Net total derivatives	(145)	(205)
Interest Rate Swaps [Member]
Derivative Assets:
Derivative assets	263	329
Derivative Liabilities:
Derivative liabilities	(9)	(14)
Interest Rate Swaps [Member] | Designated as Hedging Instrument [Member] | Fair Value [Member]
Derivative Assets:
Derivative assets	260	323
Interest Rate Swaps [Member] | Trading [Member]
Derivative Assets:
Derivative assets	3	6
Derivative Liabilities:
Derivative liabilities	(9)	(14)
Cross-Currency Interest Rate Swaps [Member]
Derivative Assets:
Derivative assets	13	28
Derivative Liabilities:
Derivative liabilities	(121)	(322)
Cross-Currency Interest Rate Swaps [Member] | Designated as Hedging Instrument [Member] | Fair Value [Member]
Derivative Assets:
Derivative assets	13	28
Derivative Liabilities:
Derivative liabilities	(121)	(322)
Floor Income Contracts [Member]
Derivative Liabilities:
Derivative liabilities	(139)	(197)
Floor Income Contracts [Member] | Trading [Member]
Derivative Liabilities:
Derivative liabilities	$ (139)	$ (197)

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