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Derivative Financial Instruments - Additional Information (Details) - USD ($)
$ in Billions
3 Months Ended
Mar. 31, 2019
Dec. 31, 2018
Derivative [Line Items]    
Notional amounts on foreign currency exchange contracts $ 2.5 $ 2.2
Maximum    
Derivative [Line Items]    
Maturity on derivative instruments 18 months  
Estimate of time to transfer 12 months