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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