CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Millions	6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017
Operating activities:
Net income (loss)	$ (158)	$ (30)
Adjustments to reconcile net loss to net cash provided by operating activities:
Depreciation of property and equipment, including internal-use software and website development	336	293
Amortization of stock-based compensation	100	97
Amortization of intangible assets	144	133
Impairment of goodwill	61	0
Deferred income taxes	(6)	2
Foreign exchange (gain) loss on cash, restricted cash and short-term investments, net	85	(58)
Realized gain on foreign currency forwards	(16)	(7)
Loss on minority equity investments, net	(61)	(6)
Other	21	(16)
Changes in operating assets and liabilities, net of effects from acquisitions:
Accounts receivable	(476)	(434)
Prepaid expenses and other assets	(96)	(46)
Accounts payable, merchant	(25)	197
Accounts payable, other, accrued expenses and other current liabilities	216	279
Tax payable/receivable, net	(159)	(158)
Deferred merchant bookings	2,268	2,030
Deferred revenue	135	101
Net cash provided by operating activities	2,491	2,389
Investing activities:
Capital expenditures, including internal-use software and website development	(411)	(357)
Purchases of investments	(1,669)	(991)
Sales and maturities of investments	624	175
Net settlement of foreign currency forwards	16	7
Acquisitions, net of cash and restricted cash acquired	0	(136)
Other, net	6	0
Net cash used in investing activities	(1,434)	(1,302)
Financing activities:
Purchases of treasury stock	(426)	(114)
Payment of dividends to stockholders	(91)	(85)
Proceeds from exercise of equity awards and employee stock purchase plan	67	137
Other, net	(6)	(19)
Net cash used in financing activities	(456)	(81)
Effect of exchange rate changes on cash, cash equivalents and restricted cash and cash equivalents	(106)	99
Net increase in cash, cash equivalents and restricted cash and cash equivalents	495	1,105
Cash, cash equivalents and restricted cash and cash equivalents at beginning of period	2,917	1,818
Cash, cash equivalents and restricted cash and cash equivalents at end of period	3,412	2,923
Supplemental cash flow information
Cash paid for interest	106	90
Income tax payments, net	$ 136	$ 107