REVENUE AND RECEIVABLES - Timing of Revenue from Contracts with Customers (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
Services transferred over time
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Revenue from contracts with customers	2,100	1,819	2,134
Goods or services transferred at a point in time
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Revenue from contracts with customers	1,522	800	1,850
Corporate and other
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Revenue from contracts with customers	31	47	44
Corporate and other | Services transferred over time
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Revenue from contracts with customers	31	47	44
Corporate and other | Goods or services transferred at a point in time
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
Vacation Ownership | Services transferred over time
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Revenue from contracts with customers	1,915	1,616	1,896
Vacation Ownership | Goods or services transferred at a point in time
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Revenue from contracts with customers	1,356	649	1,594
Exchange & Third-Party Management
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Revenue from contracts with customers	320	307	450
Exchange & Third-Party Management | Services transferred over time
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Revenue from contracts with customers	154	156	194
Exchange & Third-Party Management | Goods or services transferred at a point in time
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Revenue from contracts with customers	$ 166	$ 151	$ 256