REVENUE AND RECEIVABLES - Sources of Revenue by Segment (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Revenue from contracts with customers	$ 3,622	$ 2,619	$ 3,984
Cost reimbursements	1,128	1,042	1,108
Financing	268	267	275
Total Revenues	3,890	2,886	4,259
Sale of vacation ownership products
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Revenue from contracts with customers	1,153	546	1,354
Ancillary revenues
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Revenue from contracts with customers	191	90	228
Management fee revenues
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Revenue from contracts with customers	171	144	177
Exchange and other services revenues
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Revenue from contracts with customers	493	521	544
Management and exchange
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Revenue from contracts with customers	855	755	949
Rental
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Revenue from contracts with customers	486	276	573
Corporate and other
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Revenue from contracts with customers	31	47	44
Cost reimbursements	(121)	(141)	(119)
Financing	0	0	0
Total Revenues	31	47	44
Corporate and other | Sale of vacation ownership products
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Revenue from contracts with customers	0	0	0
Corporate and other | Ancillary revenues
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Revenue from contracts with customers	0	0	0
Corporate and other | Management fee revenues
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Revenue from contracts with customers	(19)	(22)	(13)
Corporate and other | Exchange and other services revenues
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Revenue from contracts with customers	171	210	176
Corporate and other | Management and exchange
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Revenue from contracts with customers	152	188	163
Corporate and other | Rental
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Revenue from contracts with customers	0	0	0
Vacation Ownership
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Revenue from contracts with customers	3,271	2,265	3,490
Cost reimbursements	1,202	1,124	1,136
Financing	268	265	271
Total Revenues	3,539	2,530	3,761
Vacation Ownership | Sale of vacation ownership products
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Revenue from contracts with customers	1,153	546	1,354
Vacation Ownership | Ancillary revenues
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Revenue from contracts with customers	188	89	224
Vacation Ownership | Management fee revenues
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Revenue from contracts with customers	158	149	144
Vacation Ownership | Exchange and other services revenues
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Revenue from contracts with customers	124	118	120
Vacation Ownership | Management and exchange
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Revenue from contracts with customers	470	356	488
Vacation Ownership | Rental
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Revenue from contracts with customers	446	239	512
Exchange & Third-Party Management
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Revenue from contracts with customers	320	307	450
Cost reimbursements	47	59	91
Financing	0	2	4
Total Revenues	320	309	454
Exchange & Third-Party Management | Sale of vacation ownership products
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Revenue from contracts with customers	0	0	0
Exchange & Third-Party Management | Ancillary revenues
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Revenue from contracts with customers	3	1	4
Exchange & Third-Party Management | Management fee revenues
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Revenue from contracts with customers	32	17	46
Exchange & Third-Party Management | Exchange and other services revenues
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Revenue from contracts with customers	198	193	248
Exchange & Third-Party Management | Management and exchange
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Revenue from contracts with customers	233	211	298
Exchange & Third-Party Management | Rental
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Revenue from contracts with customers	$ 40	$ 37	$ 61