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Derivative Financial Instruments - Additional Information (Details) - USD ($)
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Derivative [Line Items]      
Outstanding notional amounts on foreign currency exchange contracts $ 2,400,000,000 $ 2,900,000,000  
Gain (loss) on discontinuance of cash flow hedges $ 0 $ 0 $ 0
Maximum      
Derivative [Line Items]      
Maturity on derivative instruments 18 months    
Estimate of time to transfer 12 months