Assets and Liabilities Measured at Fair Value - Fair Value Hierarchy (Details) $ in Millions	12 Months Ended
	Dec. 31, 2016 USD ($)
Recurring
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash and Cash Equivalents, Fair Value Disclosure	$ 464
Foreign currency forward contracts	(4)
Time deposits	25
Corporate debt securities	64
Level 1 | Recurring
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash and Cash Equivalents, Fair Value Disclosure	164
Level 2 | Recurring
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash and Cash Equivalents, Fair Value Disclosure	300
Foreign currency forward contracts	(4)
Time deposits	25
Corporate debt securities	64
Foreign Exchange Forward | Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative Liability, Notional Amount	1,900
Foreign currency forward gain	10
Corporate Debt Securities | Maximum
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale Debt Securities Gross Unrealized Gain	1
Available-for-sale Debt Securities, Gross Unrealized Loss	1
Other Current Assets | Corporate Debt Securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale Securities, Debt Securities, Current	48
Other Investments | Corporate Debt Securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale Securities, Debt Securities, Noncurrent	$ 16