Derivative Instruments - Schedule of Derivative Assets and Liabilities (Details) - USD ($) $ in Millions	Dec. 31, 2017	Dec. 31, 2016
Derivative [Line Items]
Total Net Derivative Liability	$ (29)	$ (4)
Derivative instruments designated as hedges
Derivative [Line Items]
Total Net Derivative Liability	(19)	(4)
Derivative instruments not designated as hedges
Derivative [Line Items]
Total Net Derivative Liability	(10)	0
Prepaid expenses and other current assets | Foreign exchange contracts | Derivative instruments designated as hedges
Derivative [Line Items]
Derivative asset, fair value	0	12
Prepaid expenses and other current assets | Foreign exchange contracts | Derivative instruments not designated as hedges
Derivative [Line Items]
Derivative asset, fair value	0	11
Accrued liabilities | Foreign exchange contracts | Derivative instruments designated as hedges
Derivative [Line Items]
Derivative liability, fair value	(9)	0
Accrued liabilities | Foreign exchange contracts | Derivative instruments not designated as hedges
Derivative [Line Items]
Derivative liability, fair value	(2)	0
Accrued liabilities | Forward interest rate swaps | Derivative instruments designated as hedges
Derivative [Line Items]
Derivative liability, fair value	(2)	(3)
Accrued liabilities | Forward interest rate swaps | Derivative instruments not designated as hedges
Derivative [Line Items]
Derivative liability, fair value	(1)	(1)
Other long-term liabilities | Forward interest rate swaps | Derivative instruments designated as hedges
Derivative [Line Items]
Derivative liability, fair value	(8)	(13)
Other long-term liabilities | Forward interest rate swaps | Derivative instruments not designated as hedges
Derivative [Line Items]
Derivative liability, fair value	$ (7)	$ (10)