CONTINGENCIES AND COMMITMENTS (Details) $ in Millions	Mar. 31, 2020 USD ($) vacation_ownership_unit
Commitments and Contingencies Disclosure [Line Items]
Surety bonds issued	$ 103
Vacation ownership projects currently under development	7
Time share, accrued costs	$ (4)
Lease not yet commenced, term of contract	16 years
Lease not yet commenced, right-of-use asset	$ 129
Revolving corporate credit facility, net
Commitments and Contingencies Disclosure [Line Items]
Letters of credit outstanding	3
Letter of Credit
Commitments and Contingencies Disclosure [Line Items]
Letters of credit outstanding	5
New York City, New York
Commitments and Contingencies Disclosure [Line Items]
Purchase commitment	97
Bali Indonesia Resort Two
Commitments and Contingencies Disclosure [Line Items]
Purchase commitment obligation due, 2021	2
Purchase commitment obligation due, 2022	$ 23
Number of vacation ownership units expected to be acquired | vacation_ownership_unit	88
San Francisco, California
Commitments and Contingencies Disclosure [Line Items]
Purchase commitment	$ 88
Purchase commitment obligation due, 2021	32
Purchase commitment obligation due, 2022	24
Purchase commitment obligation due, 2023	32
Waikiki Hawaii
Commitments and Contingencies Disclosure [Line Items]
Purchase commitment obligation due, 2021	98
Information technology hardware and software
Commitments and Contingencies Disclosure [Line Items]
Purchase commitment	66
Purchase commitment obligation due, 2020	24
Purchase commitment obligation due, 2021	20
Purchase commitment obligation due, 2022	13
Purchase commitment obligation due, 2023	7
Purchase commitment obligation due, 2024	2
Exchange & Third-Party Management
Commitments and Contingencies Disclosure [Line Items]
Guarantor obligations, maximum exposure	27
Guarantor obligations, maximum exposure. due remainder of fiscal year	8
Guarantor obligations, maximum exposure, due in second year	9
Guarantor obligations, maximum exposure, due in third year	4
Guarantor obligations, maximum exposure, due in fourth year	2
Guarantor obligations, maximum exposure, due in five year	1
Guarantor obligations, maximum exposure, due after fifth year	$ 3