Condensed Consolidated Statements of Cash Flows - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Operating activities:
Net income	$ 27	$ 63
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	16	14
Amortization of intangible assets	8	7
Stock-based compensation expense	19	16
Deferred tax expense	2	3
Excess tax benefits from stock-based compensation	(4)	(7)
Other, net		2
Changes in operating assets and liabilities, net of effects from acquisitions:
Accounts receivable, prepaid expenses and other assets	(65)	(71)
Accounts payable, accrued expenses and other liabilities	14	4
Deferred merchant payables	72	60
Income taxes, net	1	(13)
Deferred revenue	30	21
Net cash provided by operating activities	120	99
Investing activities:
Capital expenditures, including internal-use software and website development	(17)	(31)
Acquisitions, net of cash acquired		(5)
Purchases of marketable securities	(16)	(32)
Sales of marketable securities	33	25
Maturities of marketable securities	11	9
Net cash provided by (used in) investing activities	11	(34)
Financing activities:
Repurchase of common stock	(1)
Proceeds from credit facilities		2
Principal payments on term loan		(10)
Payments to credit facilities	(90)
Proceeds from exercise of stock options	2	8
Payment of minimum withholding taxes on net share settlements of equity awards	(9)	(13)
Excess tax benefits from stock-based compensation	4	7
Other financing activities, net		3
Net cash used in financing activities	(94)	(3)
Effect of exchange rate changes on cash and cash equivalents	2	(12)
Net increase in cash and cash equivalents	39	50
Cash and cash equivalents at beginning of period	614	455
Cash and cash equivalents at end of period	$ 653	505
Supplemental disclosure of non-cash investing and financing activities:
Capitalization of construction in-process related to build to suit lease obligation		4
Capital expenditures incurred but not yet paid primarily related to build to suit lease		$ 8