CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Operating activities:
Net income	$ 398	$ 372	$ 261
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation of property and equipment, including internal-use software and website development	676	614	477
Amortization of stock-based compensation	203	149	242
Amortization and impairment of intangible assets	325	275	352
Impairment of goodwill	86	0	0
Deferred income taxes	(308)	(103)	(14)
Foreign exchange (gain) loss on cash, restricted cash and short-term investments, net	111	(79)	16
Realized (gain) loss on foreign currency forwards	(31)	(6)	53
Loss on minority equity investments, net	111	14	12
Other	22	(30)	(4)
Changes in operating assets and liabilities, net of effects from acquisitions:
Accounts receivable	(282)	(456)	(276)
Prepaid expenses and other assets	(29)	(71)	(45)
Accounts payable, merchant	(134)	316	184
Accounts payable, other, accrued expenses and other current liabilities	196	257	79
Tax payable/receivable, net	102	(30)	(100)
Deferred merchant bookings	489	593	261
Deferred revenue	40	30	51
Net cash provided by operating activities	1,975	1,845	1,549
Investing activities:
Capital expenditures, including internal-use software and website development	(878)	(710)	(749)
Purchases of investments	(1,803)	(1,811)	(45)
Sales and maturities of investments	2,137	1,096	61
Acquisitions, net of cash and restricted cash acquired	(53)	(169)	(1)
Other, net	38	13	16
Net cash used in investing activities	(559)	(1,581)	(718)
Financing activities:
Payment of long-term debt	(500)	0	0
Proceeds from issuance of long-term debt, net of issuance costs	0	990	(2)
Payment of HomeAway Convertible Notes	0	0	(401)
Purchases of treasury stock	(923)	(312)	(456)
Proceeds from issuance of treasury stock	31	0	0
Payment of dividends to stockholders	(186)	(176)	(150)
Proceeds from exercise of equity awards and employee stock purchase plan	166	229	141
Changes in controlled subsidiaries, net	(62)	(18)	208
Other, net	(15)	(25)	(31)
Net cash provided by (used in) financing activities	(1,489)	688	(691)
Effect of exchange rate changes on cash, cash equivalents and restricted cash and cash equivalents	(139)	147	(35)
Net increase (decrease) in cash, cash equivalents and restricted cash and cash equivalents	(212)	1,099	105
Cash, cash equivalents and restricted cash and cash equivalents at beginning of year	2,917	1,818	1,713
Cash, cash equivalents and restricted cash and cash equivalents at end of year	2,705	2,917	1,818
Supplemental cash flow information
Cash paid for interest	196	163	154
Income tax payments, net	$ 282	$ 174	$ 124