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Derivative Financial Instruments - Additional Information (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Dec. 31, 2018
Derivative [Line Items]          
Notional amounts on foreign currency exchange contracts $ 2,900   $ 2,900   $ 2,200
Gain (Loss) on Discontinuation of Cash Flow Hedges $ 0 $ 0 $ 0 $ 0  
Maximum          
Derivative [Line Items]          
Maturity on derivative instruments 18 years        
Estimate of time to transfer 12 years