SUPPLEMENTAL GUARANTOR INFORMATION - Statement of Income (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Statement of Income
Revenue	$ 452	$ 186
Operating expenses	(388)	(146)
Interest (expense) income, net	(5)	(6)
Other income (expense), net	10	1
Income tax benefit (provision)	(25)	(13)
Equity in earnings from unconsolidated entities	1	1
Net income	45	23
Net income attributable to noncontrolling interests	(1)	(1)
Net income attributable to common stockholders	44	22
Total Eliminations
Statement of Income
Other income (expense), net	(111)	(53)
Net income	(111)	(53)
Net income attributable to common stockholders	(111)	(53)
ILG
Statement of Income
Operating expenses	(2)	(1)
Other income (expense), net	45	23
Income tax benefit (provision)	1
Net income	44	22
Net income attributable to common stockholders	44	22
Interval Acquisition Corp
Statement of Income
Interest (expense) income, net	(6)	(7)
Other income (expense), net	49	27
Income tax benefit (provision)	2	3
Net income	45	23
Net income attributable to common stockholders	45	23
Guarantor Subsidiaries
Statement of Income
Revenue	379	160
Operating expenses	(333)	(124)
Interest (expense) income, net	2	1
Other income (expense), net	17	3
Income tax benefit (provision)	(17)	(14)
Equity in earnings from unconsolidated entities	1	1
Net income	49	27
Net income attributable to common stockholders	49	27
Non-Guarantor Subsidiaries
Statement of Income
Revenue	73	26
Operating expenses	(53)	(21)
Interest (expense) income, net	(1)
Other income (expense), net	10	1
Income tax benefit (provision)	(11)	(2)
Net income	18	4
Net income attributable to noncontrolling interests	(1)	(1)
Net income attributable to common stockholders	$ 17	$ 3