Condensed Consolidated Statements of Cash Flows - USD ($) $ in Millions	6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018
Operating activities:
Net income	$ 60	$ 36
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	46	41
Amortization of intangible assets	15	16
Stock-based compensation expense	60	61
Deferred tax expense (benefit)	17	(3)
Other, net	6	11
Changes in operating assets and liabilities, net of effects from acquisitions:
Accounts receivable and contract assets, prepaid expenses and other assets	(61)	(82)
Accounts payable, accrued expenses and other liabilities	(1)	29
Deferred merchant payables	183	201
Income tax receivables/payables, net	3	5
Deferred revenue	35	45
Net cash provided by operating activities	363	360
Investing activities:
Capital expenditures, including internal-use software and website development	(38)	(31)
Purchases of marketable securities	(69)	(1)
Sales of marketable securities		45
Maturities of marketable securities	20	5
Acquisitions and other investments, net of cash acquired		(23)
Net cash used in investing activities	(87)	(5)
Financing activities:
Repurchase of common stock		(100)
Proceeds from exercise of stock options	1	3
Payment of withholding taxes on net share settlements of equity awards	(26)	(18)
Other financing activities, net	(3)
Net cash used in financing activities	(28)	(353)
Effect of exchange rate changes on cash, cash equivalents and restricted cash	(2)	(9)
Net increase (decrease) in cash, cash equivalents and restricted cash	246	(7)
Cash, cash equivalents and restricted cash at beginning of period	655	673
Cash, cash equivalents and restricted cash at end of period	$ 901	666
2015 Credit Facility
Financing activities:
Proceeds from credit facility		5
Payments to credit facility		(235)
Chinese Credit Facilities
Financing activities:
Proceeds from credit facility		2
Payments to credit facility		$ (10)