Assets and Liabilities Measured at Fair Value - Fair Value Hierarchy (Details) - USD ($) $ in Millions	Mar. 31, 2017	Dec. 31, 2016
Recurring
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash and Cash Equivalents, Fair Value Disclosure	$ 516	$ 464
Foreign currency forward contracts	(2)	(4)
Time deposits	812	25
Corporate debt securities	57	64
Level 1 | Recurring
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash and Cash Equivalents, Fair Value Disclosure	197	164
Level 2 | Recurring
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash and Cash Equivalents, Fair Value Disclosure	319	300
Foreign currency forward contracts	(2)	(4)
Time deposits	812	25
Corporate debt securities	57	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 loss	(4)
Corporate Debt Securities | Maximum
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale Debt Securities, Accumulated Gross Unrealized Gain, before Tax	1
Available-for-sale debt securities gross unrealized loss	1
Other Current Assets | Expedia
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Time deposits	6
Other Current Assets | Expedia | Corporate Debt Securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale Securities, Debt Securities, Current	46	48
Other Assets, net | Expedia | Corporate Debt Securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale Securities, Debt Securities, Noncurrent	$ 12	$ 16