Derivatives and Hedging - Offsetting of financial liabilities and derivative liabilities (Details) - USD ($) $ in Millions	Dec. 31, 2016	Dec. 31, 2015
Other Current Liabilities
Derivative [Line Items]
Gross Amounts of Recognized Liabilities	$ 7	$ 13
Net Amounts of Liabilities Presented in the Statement of Financial Position (1)	5	4
Other Noncurrent Liabilities
Derivative [Line Items]
Gross Amounts of Recognized Liabilities	7	5
Net Amounts of Liabilities Presented in the Statement of Financial Position (1)	7	1
Designated as Hedging Instrument | Foreign exchange contracts
Derivative [Line Items]
Gross Amounts of Recognized Liabilities	13	18
Gross Amounts Offset in the Statement of Financial Position	(1)	(13)
Net Amounts of Liabilities Presented in the Statement of Financial Position (1)	12	5
Not Designated as Hedging Instrument
Derivative [Line Items]
Gross Amounts of Recognized Liabilities	14	18
Not Designated as Hedging Instrument | Foreign exchange contracts
Derivative [Line Items]
Gross Amounts of Recognized Liabilities	$ 1	$ 0