Condensed Consolidated Statements of Cash Flows - USD ($) $ in Millions	6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015
Operating activities:
Net income	$ 62	$ 121
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	33	28
Amortization of intangible assets	15	16
Stock-based compensation expense	42	34
Deferred tax (benefit) expense	(5)	9
Excess tax benefits from stock-based compensation	(6)	(30)
Changes in operating assets and liabilities, net of effects from acquisitions:
Accounts receivable, prepaid expenses and other assets	(51)	(92)
Accounts payable, accrued expenses and other liabilities	43	33
Deferred merchant payables	179	149
Income taxes, net	11
Deferred revenue	34	31
Net cash provided by operating activities	357	299
Investing activities:
Capital expenditures, including internal-use software and website development	(36)	(54)
Acquisitions, net of cash acquired	1	(29)
Purchases of marketable securities	(98)	(92)
Sales of marketable securities	40	46
Maturities of marketable securities	17	22
Net cash used in investing activities	(76)	(107)
Financing activities:
Repurchase of common stock	(12)
Proceeds from credit facilities		4
Payments to credit facilities	(109)
Principal payments on term loan		(300)
Proceeds from revolving credit facility, net of financing costs		287
Proceeds from exercise of stock options	3	9
Payment of minimum withholding taxes on net share settlements of equity awards	(11)	(62)
Excess tax benefits from stock-based compensation	6	30
Other financing activities, net		12
Net cash used in financing activities	(123)	(61)
Effect of exchange rate changes on cash and cash equivalents	(6)	(3)
Net increase in cash and cash equivalents	152	128
Cash and cash equivalents at beginning of period	614	455
Cash and cash equivalents at end of period	$ 766	583
Supplemental disclosure of non-cash investing and financing activities:
Capitalization of construction in-process related to build to suit lease obligation		6
Capital expenditures incurred but not yet paid related to build to suit lease		9
Chinese Credit Facilities
Financing activities:
Payments to credit facilities		$ (41)