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Derivative Financial Instruments - Additional Information (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
Dec. 31, 2018
Derivative [Line Items]          
Gain (Loss) on Discontinuation of Cash Flow Hedges $ 0 $ 0 $ 0 $ 0  
Derivative, Notional Amount $ 3,200   $ 3,200   $ 2,200
Maximum          
Derivative [Line Items]          
Maturity on derivative instruments 18 months        
Estimate of time to transfer 12 months