Guarantor and Non-Guarantor Supplemental Financial Information - Schedule of Cash Flow Statement Information (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Operating activities:
Net cash provided by operating activities	$ 2,767	$ 1,975	$ 1,845
Investing activities:
Capital expenditures, including internal-use software and website development	(1,160)	(878)	(710)
Purchases of investments	(1,346)	(1,803)	(1,811)
Sales and maturities of investments	852	2,137	1,096
Acquisitions, net of cash and restricted cash acquired	80	(53)	(169)
Transfers (to) from related parties	0	0	0
Other Investing Activities Net	21	38	13
Net cash used in investing activities	(1,553)	(559)	(1,581)
Financing activities:
Proceeds from issuance of long-term debt, net of debt issuance costs	1,231	0	990
Payment of Liberty Expedia Exchangeable Debentures	(400)	0	0
Purchases of treasury stock	(743)	(923)	(312)
Proceeds from issuance of treasury stock	0	31	0
Payment of dividends to stockholders	(195)	(186)	(176)
Proceeds from exercise of equity awards and employee stock purchase plan	301	166	229
Changes in controlled subsidiaries, net	(28)	(62)	(18)
Transfers (to) from related parties	0	0	0
Other, net	9	(15)	(25)
Payment of long-term debt	0	(500)	0
Net cash provided by (used in) financing activities	175	(1,489)	688
Effect of exchange rate changes on cash, cash equivalents and restricted cash and cash equivalents	3	(139)	147
Net increase (decrease) in cash, cash equivalents and restricted cash and cash equivalents	1,392	(212)	1,099
Cash, cash equivalents and restricted cash and cash equivalents at beginning of year	2,705	2,917	1,818
Cash, cash equivalents and restricted cash and cash equivalents at end of year	4,097	2,705	2,917
Reportable Legal Entities | Parent
Operating activities:
Net cash provided by operating activities	0	0	0
Investing activities:
Capital expenditures, including internal-use software and website development	0	0	0
Purchases of investments	0	0	0
Sales and maturities of investments	0	0	0
Acquisitions, net of cash and restricted cash acquired	0	0	0
Transfers (to) from related parties	(351)	0	0
Other Investing Activities Net	0	0	0
Net cash used in investing activities	(351)	0	0
Financing activities:
Proceeds from issuance of long-term debt, net of debt issuance costs	1,231		990
Payment of Liberty Expedia Exchangeable Debentures	0
Purchases of treasury stock	(743)	(923)	(312)
Proceeds from issuance of treasury stock		31
Payment of dividends to stockholders	(195)	(186)	(176)
Proceeds from exercise of equity awards and employee stock purchase plan	301	166	228
Changes in controlled subsidiaries, net	0	0	0
Transfers (to) from related parties	(242)	1,415	(725)
Other, net	(1)	(3)	(5)
Payment of long-term debt		(500)
Net cash provided by (used in) financing activities	351	0	0
Effect of exchange rate changes on cash, cash equivalents and restricted cash and cash equivalents	0	0	0
Net increase (decrease) in cash, cash equivalents and restricted cash and cash equivalents	0	0	0
Cash, cash equivalents and restricted cash and cash equivalents at beginning of year	0	0	0
Cash, cash equivalents and restricted cash and cash equivalents at end of year	0	0	0
Reportable Legal Entities | Guarantor Subsidiaries
Operating activities:
Net cash provided by operating activities	2,113	1,248	1,312
Investing activities:
Capital expenditures, including internal-use software and website development	(1,058)	(752)	(546)
Purchases of investments	(1,280)	(1,720)	(1,222)
Sales and maturities of investments	816	2,063	875
Acquisitions, net of cash and restricted cash acquired	80	(53)	(168)
Transfers (to) from related parties	296	(86)	(5)
Other Investing Activities Net	21	35	7
Net cash used in investing activities	(1,125)	(513)	(1,059)
Financing activities:
Proceeds from issuance of long-term debt, net of debt issuance costs	0		0
Payment of Liberty Expedia Exchangeable Debentures	(400)
Purchases of treasury stock	0	0	0
Proceeds from issuance of treasury stock		0
Payment of dividends to stockholders	0	0	0
Proceeds from exercise of equity awards and employee stock purchase plan	0	0	0
Changes in controlled subsidiaries, net	(17)	0	0
Transfers (to) from related parties	443	(785)	605
Other, net	11	(10)	(15)
Payment of long-term debt		0
Net cash provided by (used in) financing activities	37	(795)	590
Effect of exchange rate changes on cash, cash equivalents and restricted cash and cash equivalents	8	(71)	36
Net increase (decrease) in cash, cash equivalents and restricted cash and cash equivalents	1,033	(131)	879
Cash, cash equivalents and restricted cash and cash equivalents at beginning of year	1,190	1,321	442
Cash, cash equivalents and restricted cash and cash equivalents at end of year	2,223	1,190	1,321
Reportable Legal Entities | Non-Guarantor Subsidiaries
Operating activities:
Net cash provided by operating activities	654	727	533
Investing activities:
Capital expenditures, including internal-use software and website development	(102)	(126)	(164)
Purchases of investments	(66)	(83)	(589)
Sales and maturities of investments	36	74	221
Acquisitions, net of cash and restricted cash acquired	0	0	(1)
Transfers (to) from related parties	55	86	5
Other Investing Activities Net	0	3	6
Net cash used in investing activities	(77)	(46)	(522)
Financing activities:
Proceeds from issuance of long-term debt, net of debt issuance costs	0		0
Payment of Liberty Expedia Exchangeable Debentures	0
Purchases of treasury stock	0	0	0
Proceeds from issuance of treasury stock		0
Payment of dividends to stockholders	0	0	0
Proceeds from exercise of equity awards and employee stock purchase plan	0	0	1
Changes in controlled subsidiaries, net	(11)	(62)	(18)
Transfers (to) from related parties	(201)	(630)	120
Other, net	(1)	(2)	(5)
Payment of long-term debt		0
Net cash provided by (used in) financing activities	(213)	(694)	98
Effect of exchange rate changes on cash, cash equivalents and restricted cash and cash equivalents	(5)	(68)	111
Net increase (decrease) in cash, cash equivalents and restricted cash and cash equivalents	359	(81)	220
Cash, cash equivalents and restricted cash and cash equivalents at beginning of year	1,515	1,596	1,376
Cash, cash equivalents and restricted cash and cash equivalents at end of year	$ 1,874	$ 1,515	$ 1,596