Condensed Consolidated Statements of Cash Flows - USD ($) $ in Millions		9 Months Ended
		Sep. 30, 2016	Sep. 30, 2015
Operating activities:
Net income		$ 119	$ 195
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation of property and equipment, including amortization of internal-use software and website development		51	42
Amortization of intangible assets		23	26
Stock-based compensation expense		64	52
Gain on sale of business	[1]		(17)
Deferred tax (benefit) expense		(14)	3
Other, net		5	7
Changes in operating assets and liabilities, net of effects from acquisitions and dispositions:
Accounts receivable, prepaid expenses and other assets		(40)	(75)
Accounts payable, accrued expenses and other liabilities		2	24
Deferred merchant payables		42	52
Income taxes, net		19	20
Deferred revenue		6	10
Net cash provided by operating activities		277	339
Investing activities:
Capital expenditures, including internal-use software and website development		(57)	(93)
Acquisitions, net of cash acquired		(23)	(29)
Proceeds from sale of business, net of cash sold			22
Purchases of marketable securities		(145)	(150)
Sales of marketable securities		62	72
Maturities of marketable securities		22	52
Net cash used in investing activities		(141)	(126)
Financing activities:
Repurchase of common stock		(21)
Proceeds from exercise of stock options		6	10
Payment of withholding taxes on net share settlements of equity awards		(13)	(66)
Other financing activities, net			13
Net cash used in financing activities		(133)	(93)
Effect of exchange rate changes on cash and cash equivalents		(6)	(8)
Net (decrease) increase in cash and cash equivalents		(3)	112
Cash and cash equivalents at beginning of period		614	455
Cash and cash equivalents at end of period		611	567
Supplemental disclosure of non-cash investing and financing activities:
Capitalization of construction in-process related to build to suit lease obligation			6
Chinese Credit Facilities
Financing activities:
Proceeds from credit facilities		2	4
Payments to credit facilities			(41)
2015 Credit Facility
Financing activities:
Payments to credit facilities		(190)
Proceeds from credit facility, net of financing costs		10	287
2011 Credit Facility
Financing activities:
Principal payments on credit facilities			$ (300)
2016 Credit Facility
Financing activities:
Proceeds from credit facility, net of financing costs		$ 73

[1] In August 2015, we sold 100% interest in one of our Chinese subsidiaries to an unrelated third party for $28 million in cash consideration and recognized a $17 million gain on sale of subsidiary in the third quarter of 2015.