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Derivative Financial Instruments - Impact of Derivatives on Other Comprehensive Income (Equity) (Detail) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Derivative Instruments Gain Loss [Line Items]
Total gains (losses) on cash flow hedges	$ (5)	$ (28)	$ 22	$ (237)
Net changes in cash flow hedges, net of taxes	17	(17)	65	(226)
Interest Expense [Member]
Derivative Instruments Gain Loss [Line Items]
Reclassification adjustments for derivative (gains) losses included in net income (interest expense)	$ 22	$ 11	$ 43	$ 11

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Amount, after tax and reclassification, of gain (loss) from derivative instrument designated and qualifying as cash flow hedge included in assessment of hedge effectiveness.

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Amount after tax and reclassification adjustments, of increase (decrease) in accumulated gain (loss) from derivative instruments designated and qualifying as the effective portion of cash flow hedges and an entity's share of an equity investee's increase (decrease) in deferred hedging gain (loss).

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Amount after tax of reclassification adjustment from accumulated other comprehensive income of accumulated gain (loss) realized from derivative instruments designated and qualifying as the effective portion of cash flow hedges and an entity's share of an equity investee's deferred hedging gain (loss).

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