SUPPLEMENTAL GUARANTOR INFORMATION - Statement of Income (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Statement of Income
Revenue	$ 450	$ 297	$ 902	$ 483
Operating expenses	(404)	(270)	(791)	(417)
Interest (expense) income, net	(7)	(6)	(12)	(11)
Other income (expense), net		198	10	199
Income tax (provision) benefit	(14)	(36)	(39)	(49)
Equity in earnings from unconsolidated entities	2	1	3	2
Net income	27	184	73	207
Net income attributable to noncontrolling interests		(1)	(1)	(1)
Net income attributable to common stockholders	27	183	72	206
Total Eliminations
Statement of Income
Other income (expense), net	(68)	(64)	(193)	(117)
Net income	(68)	(64)	(193)	(117)
Net income attributable to common stockholders	(68)	(64)	(193)	(117)
ILG
Statement of Income
Operating expenses	(1)	(1)	(3)	(2)
Other income (expense), net	29	221	74	245
Income tax (provision) benefit		(37)	1	(37)
Net income	28	183	72	206
Net income attributable to common stockholders	28	183	72	206
Interval Acquisition Corp
Statement of Income
Interest (expense) income, net	(5)	(7)	(10)	(13)
Other income (expense), net	33	32	81	58
Income tax (provision) benefit	2		5	3
Net income	30	25	76	48
Net income attributable to common stockholders	30	25	76	48
Guarantor Subsidiaries
Statement of Income
Revenue	374	253	753	413
Operating expenses	(345)	(234)	(691)	(359)
Interest (expense) income, net		1	2	2
Other income (expense), net	1	8	31	11
Income tax (provision) benefit	(3)	2	(19)	(12)
Equity in earnings from unconsolidated entities	2	1	3	2
Net income	29	31	79	57
Net income attributable to noncontrolling interests	1		1	1
Net income attributable to common stockholders	30	31	80	58
Non-Guarantor Subsidiaries
Statement of Income
Revenue	76	44	149	70
Operating expenses	(58)	(35)	(97)	(56)
Interest (expense) income, net	(2)		(4)
Other income (expense), net	5	1	17	2
Income tax (provision) benefit	(13)	(1)	(26)	(3)
Net income	8	9	39	13
Net income attributable to noncontrolling interests	(1)	(1)	(2)	(2)
Net income attributable to common stockholders	$ 7	$ 8	$ 37	$ 11