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SHARE-BASED COMPENSATION - Additional Information (Details) - USD ($)		3 Months Ended		9 Months Ended
	Sep. 01, 2018	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018	Dec. 31, 2018
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based compensation expense		$ 9,000,000	$ 13,000,000	$ 29,000,000	$ 23,000,000
Payroll and benefits liability		$ 185,000,000		$ 185,000,000		$ 206,000,000
Stock options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares authorized for issuance under the plan (in shares)		6,000,000		6,000,000
Shares available for grants under the plan (in shares) (less than)		1,000,000		1,000,000
Share-based compensation expense		$ 0	0	$ 0	0
Restricted stock units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based compensation expense		9,000,000	12,000,000	$ 27,000,000	21,000,000
Restricted stock units \| Employees and Non Employee Directors
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock awards, grants in period (in shares)				190,403
Stock awards granted, weighted average (in usd per share) grant date fair value				$ 96.30
Performance-based RSUs
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Maximum amount of RSU subject to vesting (in shares)				287,876
Share-based compensation expense		3,000,000	1,000,000	$ 6,000,000	4,000,000
SARs
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock awards, grants in period (in shares)				111,111
Stock awards granted, weighted average (in usd per share) grant date fair value				$ 28.89
Stock awards granted, weighted average (in usd per share) exercise date fair value				$ 100.52
Share-based compensation expense		0	$ 1,000,000	$ 2,000,000	$ 2,000,000
Legacy-ILG
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Payroll and benefits liability		$ 0		$ 0
Legacy-ILG \| Restricted stock units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares available for grants under the plan (in shares) (less than)		1,000,000		1,000,000
Legacy-ILG \| Deferred Share Units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Weighted average grant date fair value (in usd per share)	$ 114.31
Equity instruments other than options (in shares)	12,265
Legacy-ILG \| Cash-Based Award
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based compensation expense	$ 1,000,000