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Fair Value Measurements - Included in Earnings (Detail) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Fair Value Net Derivative Asset Liability Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]        
Gains (losses) on derivative and hedging activities, net $ 112 $ 48 $ 175 $ (59)
Gain (Losses) on Derivative Instruments [Member]        
Fair Value Net Derivative Asset Liability Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]        
Gains (losses) on derivative and hedging activities, net 1 1 2 6
Interest Expense [Member]        
Fair Value Net Derivative Asset Liability Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]        
Gains (losses) on derivative and hedging activities, net $ 111 $ 47 $ 173 $ (65)