CONSOLIDATED STATEMENTS OF CHANGES IN STOCKHOLDERS' EQUITY - USD ($) $ in Millions	Total	Common stock	Common stock Class B common stock	Additional paid-in capital	Treasury stock	Retained earnings (deficit)	Accumulated other comprehensive income (loss)	Non-redeemable non-controlling interest	Liberty Expedia Holdings	Liberty Expedia Holdings Common stock	Liberty Expedia Holdings Additional paid-in capital	Liberty Expedia Holdings Treasury stock
Beginning balance (in shares) at Dec. 31, 2017		228,467,355	12,799,999		89,528,255
Beginning balance at Dec. 31, 2017	$ 6,129	$ 0	$ 0	$ 9,163	$ (4,822)	$ 331	$ (149)	$ 1,606
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)	373					389		(16)
Other comprehensive income (loss), net of taxes	(63)						(50)	(13)
Payment of dividends to stockholders	(138)					(138)
Proceeds from exercise of equity instruments and employee stock purchase plans (in shares)		2,396,575
Proceeds from exercise of equity instruments and employee stock purchase plans	138			138
Treasury stock activity related to vesting of equity instruments (in shares)					165,577
Treasury stock activity related to vesting of equity instruments	(18)				$ (18)
Stock repurchases (in shares)					5,194,793
Common stock repurchases	(602)				$ (602)
Issuance of treasury stock (in shares)					(269,646)
Issuance of treasury stock	31			27	$ 4
Purchase of remaining interest in Air Asia	(62)			(5)				(57)
Other changes in ownership of non-controlling interests	19			(2)				21
Impact of adoption of new accounting guidance	(34)					(31)	(3)
Other	(1)				$ (1)	0
Issuance of common stock in connection with acquisitions (in shares)		175,040
Issuance of common stock in connection with acquisitions	0
Stock-based compensation expense	157			157
Withholding taxes for stock options	(2)			(2)
Ending balance (in shares) at Sep. 30, 2018		231,038,970	12,799,999		94,618,979
Ending balance at Sep. 30, 2018	5,927	$ 0	$ 0	9,476	$ (5,439)	551	(202)	1,541
Beginning balance (in shares) at Jun. 30, 2018		230,158,642	12,799,999		93,379,790
Beginning balance at Jun. 30, 2018	5,552	$ 0	$ 0	9,331	$ (5,248)	74	(190)	1,585
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)	532					525		7
Other comprehensive income (loss), net of taxes	(14)						(12)	(2)
Payment of dividends to stockholders	(47)					(47)
Proceeds from exercise of equity instruments and employee stock purchase plans (in shares)		880,328
Proceeds from exercise of equity instruments and employee stock purchase plans	71			71
Treasury stock activity related to vesting of equity instruments (in shares)					15,315
Treasury stock activity related to vesting of equity instruments	(1)				$ (1)
Stock repurchases (in shares)					1,493,520
Common stock repurchases	(193)				$ (193)
Issuance of treasury stock (in shares)					(269,646)
Issuance of treasury stock	31			27	$ 4
Purchase of remaining interest in Air Asia	(62)			(5)				(57)
Other changes in ownership of non-controlling interests	6			(2)				8
Other	(2)				$ (1)	(1)
Stock-based compensation expense	54			54
Ending balance (in shares) at Sep. 30, 2018		231,038,970	12,799,999		94,618,979
Ending balance at Sep. 30, 2018	5,927	$ 0	$ 0	9,476	$ (5,439)	551	(202)	1,541
Beginning balance (in shares) at Dec. 31, 2018		231,492,986	12,799,999		97,158,586
Beginning balance at Dec. 31, 2018	5,651	$ 0	$ 0	9,549	$ (5,742)	517	(220)	1,547
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)	496					489		7
Other comprehensive income (loss), net of taxes	(56)						(38)	(18)
Payment of dividends to stockholders	(145)					(145)
Proceeds from exercise of equity instruments and employee stock purchase plans (in shares)		4,037,832
Proceeds from exercise of equity instruments and employee stock purchase plans	277			277
Treasury stock activity related to vesting of equity instruments (in shares)					249,417
Treasury stock activity related to vesting of equity instruments	$ (31)				$ (31)
Stock repurchases (in shares)	2,300,000				2,300,944							23,876,671
Common stock repurchases	$ (300)				$ (300)							$ (3,217)
Other changes in ownership of non-controlling interests	16			(3)				19
Stock-based compensation expense	177			177
Withholding taxes for stock options	(2)			(2)
Liberty Expedia Holdings transaction, shares issued (in shares)										20,745,181
Liberty Expedia Holdings transaction, shares issued											$ 2,883
Liberty Expedia Holdings transaction									$ (334)
Adjustment to the fair value of redeemable non-controlling interests	(17)					(17)
Impact of adoption of new accounting guidance	6					6
Other	1			1
Ending balance (in shares) at Sep. 30, 2019		256,275,999	12,799,999		123,585,618
Ending balance at Sep. 30, 2019	5,739	$ 0	$ 0	12,882	$ (9,290)	850	(258)	1,555
Beginning balance (in shares) at Jun. 30, 2019		234,102,186	12,799,999		97,384,212
Beginning balance at Jun. 30, 2019	5,907	$ 0	$ 0	9,821	$ (5,771)	508	(216)	1,565
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)	409					409
Other comprehensive income (loss), net of taxes	(58)						(42)	(16)
Payment of dividends to stockholders	(50)					(50)
Proceeds from exercise of equity instruments and employee stock purchase plans (in shares)		1,428,632
Proceeds from exercise of equity instruments and employee stock purchase plans	121			121
Treasury stock activity related to vesting of equity instruments (in shares)					23,791
Treasury stock activity related to vesting of equity instruments	(2)				$ (2)
Stock repurchases (in shares)					2,300,944							23,876,671
Common stock repurchases	(300)				$ (300)				(3,200)			$ (3,217)
Other changes in ownership of non-controlling interests	6							6
Stock-based compensation expense	58			58
Liberty Expedia Holdings transaction, shares issued (in shares)										20,745,181
Liberty Expedia Holdings transaction, shares issued											$ 2,883
Liberty Expedia Holdings transaction									$ (334)
Adjustment to the fair value of redeemable non-controlling interests	(17)					(17)
Other	(1)			(1)
Ending balance (in shares) at Sep. 30, 2019		256,275,999	12,799,999		123,585,618
Ending balance at Sep. 30, 2019	$ 5,739	$ 0	$ 0	$ 12,882	$ (9,290)	$ 850	$ (258)	$ 1,555