INTERIM CONSOLIDATED STATEMENTS OF SHAREHOLDERS EQUITY - USD ($) $ in Millions	Total	Common Stock	Treasury Stock	Additional Paid-In Capital	Accumulated Other Comprehensive Income (Loss)	Retained Earnings	Total MVW Shareholders' Equity	Noncontrolling Interests
Balance (in shares) at Dec. 31, 2017	36,900,000
Balance at Dec. 31, 2017	$ 1,041	$ 0	$ (694)	$ 1,189	$ 17	$ 529	$ 1,041	$ 0
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net (loss) income	36					36	36
Foreign currency translation adjustments	$ 6				6		6
Amounts related to share-based compensation (in shares)	100,000
Share-based compensation plans	$ (5)			(5)			(5)
Repurchase of common stock (in shares)	0
Repurchase of common stock	$ (2)		(2)				(2)
Dividends	$ (10)					(10)	(10)
Balance (in shares) at Mar. 31, 2018	37,000,000.0
Balance at Mar. 31, 2018	$ 1,066	0	(696)	1,184	23	555	1,066	0
Balance (in shares) at Dec. 31, 2017	36,900,000
Balance at Dec. 31, 2017	$ 1,041	0	(694)	1,189	17	529	1,041	0
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net (loss) income	11
Foreign currency translation adjustments	0
Derivative instrument adjustment, net of tax	$ (1)
Balance (in shares) at Sep. 30, 2018	57,600,000
Balance at Sep. 30, 2018	$ 3,543	1	(696)	3,697	16	500	3,518	25
Balance (in shares) at Mar. 31, 2018	37,000,000.0
Balance at Mar. 31, 2018	$ 1,066	0	(696)	1,184	23	555	1,066	0
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net (loss) income	11					11	11
Foreign currency translation adjustments	$ (7)				(7)		(7)
Amounts related to share-based compensation (in shares)	0
Share-based compensation plans	$ 7			7			7
Dividends	$ (11)					(11)	(11)
Balance (in shares) at Jun. 30, 2018	37,000,000.0
Balance at Jun. 30, 2018	$ 1,066	0	(696)	1,191	16	555	1,066	0
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net (loss) income	$ (36)						(36)
ILG acquisitions (in shares)	20,500,000
ILG Acquisition	$ 2,466	1		2,440			2,441	25
Foreign currency translation adjustments	1				1		1
Derivative instrument adjustment, net of tax	$ (1)				(1)		(1)
Amounts related to share-based compensation (in shares)	100,000
Share-based compensation plans	$ 66			66			66
Dividends	$ (19)					(19)	(19)
Balance (in shares) at Sep. 30, 2018	57,600,000
Balance at Sep. 30, 2018	$ 3,543	1	(696)	3,697	16	500	3,518	25
Balance (in shares) at Dec. 31, 2018	57,626,462
Balance at Dec. 31, 2018	$ 3,466	1	(790)	3,721	6	523	3,461	5
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net (loss) income	24					24	24
Foreign currency translation adjustments	1				1		1
Derivative instrument adjustment	$ (3)				(3)		(3)
Amounts related to share-based compensation (in shares)	200,000
Share-based compensation plans	$ (4)			(4)			(4)
Repurchase of common stock (in shares)	0
Repurchase of common stock	$ (106)		(106)				(106)
Dividends	$ (20)					(20)	(20)
Employee stock plan issuance (in shares)	0
Employee stock plan issuance	$ 1		1				1
Balance (in shares) at Mar. 31, 2019	57,800,000
Balance at Mar. 31, 2019	$ 3,351	1	(895)	3,717	4	519	3,346	5
Balance (in shares) at Dec. 31, 2018	57,626,462
Balance at Dec. 31, 2018	$ 3,466	1	$ (790)	3,721	6	523	3,461	5
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net (loss) income	66
Foreign currency translation adjustments	(5)
Derivative instrument adjustment	$ (20)
Repurchase of common stock (in shares)			3,667,175
Repurchase of common stock			$ (342)
Balance (in shares) at Sep. 30, 2019	57,874,390
Balance at Sep. 30, 2019	$ 3,122	1	(1,130)	3,740	(19)	520	3,112	10
Balance (in shares) at Mar. 31, 2019	57,800,000
Balance at Mar. 31, 2019	$ 3,351	1	(895)	3,717	4	519	3,346	5
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net (loss) income	49					49	49
Change in business combination acquisition of less than 100 percent noncontrolling interest fair value	1							1
Foreign currency translation adjustments	(2)				(2)		(2)
Derivative instrument adjustment	$ (13)				(13)		(13)
Amounts related to share-based compensation (in shares)	0
Share-based compensation plans	$ 13			13			13
Repurchase of common stock (in shares)	0
Repurchase of common stock	$ (109)		(109)				(109)
Dividends	$ (20)					(20)	(20)
Employee stock plan issuance (in shares)	100,000
Employee stock plan issuance	$ 0		0				0
Balance (in shares) at Jun. 30, 2019	57,900,000
Balance at Jun. 30, 2019	$ 3,270	1	(1,004)	3,730	(11)	548	3,264	6
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net (loss) income	(7)					(9)	(9)	2
Change in business combination acquisition of less than 100 percent noncontrolling interest fair value	2							2
Foreign currency translation adjustments	(4)				(4)		(4)
Derivative instrument adjustment	$ (4)				(4)		(4)
Amounts related to share-based compensation (in shares)	0
Share-based compensation plans	$ 10			10			10
Repurchase of common stock (in shares)	0
Repurchase of common stock	$ (127)		(127)				(127)
Dividends	$ (19)					(19)	(19)
Employee stock plan issuance (in shares)	0
Employee stock plan issuance	$ 1		1				1
Balance (in shares) at Sep. 30, 2019	57,874,390
Balance at Sep. 30, 2019	$ 3,122	$ 1	$ (1,130)	$ 3,740	$ (19)	$ 520	$ 3,112	$ 10