VACATION OWNERSHIP NOTES RECEIVABLE - Future Principal Payments, Net of Reserves, and Interest Rates of Vacation Ownership Notes Receivable (Details) $ in Millions	Sep. 30, 2020 USD ($)
Acquired
Future Minimum Payments Receivable [Line Items]
2020	$ 15
2021	45
2022	45
2023	44
2024	42
Thereafter	146
Total Vacation ownership notes receivable, net of reserve	337
Acquired \| Non-Securitized
Future Minimum Payments Receivable [Line Items]
2020	1
2021	4
2022	4
2023	4
2024	4
Thereafter	18
Total Vacation ownership notes receivable, net of reserve	35
Acquired \| Securitized Vacation Ownership Notes Receivable
Future Minimum Payments Receivable [Line Items]
2020	14
2021	41
2022	41
2023	40
2024	38
Thereafter	128
Total Vacation ownership notes receivable, net of reserve	$ 302
Acquired \| Weighted Average
Future Minimum Payments Receivable [Line Items]
Time-sharing Transactions, Stated Interest Rate for Notes Receivable	13.40%
Acquired \| Weighted Average \| Non-Securitized
Future Minimum Payments Receivable [Line Items]
Time-sharing Transactions, Stated Interest Rate for Notes Receivable	13.40%
Acquired \| Weighted Average \| Securitized Vacation Ownership Notes Receivable
Future Minimum Payments Receivable [Line Items]
Time-sharing Transactions, Stated Interest Rate for Notes Receivable	13.50%
Acquired \| Minimum
Future Minimum Payments Receivable [Line Items]
Time-sharing Transactions, Stated Interest Rate for Notes Receivable	3.00%
Acquired \| Minimum \| Non-Securitized
Future Minimum Payments Receivable [Line Items]
Time-sharing Transactions, Stated Interest Rate for Notes Receivable	3.00%
Acquired \| Minimum \| Securitized Vacation Ownership Notes Receivable
Future Minimum Payments Receivable [Line Items]
Time-sharing Transactions, Stated Interest Rate for Notes Receivable	6.00%
Acquired \| Maximum
Future Minimum Payments Receivable [Line Items]
Time-sharing Transactions, Stated Interest Rate for Notes Receivable	17.90%
Acquired \| Maximum \| Non-Securitized
Future Minimum Payments Receivable [Line Items]
Time-sharing Transactions, Stated Interest Rate for Notes Receivable	17.90%
Acquired \| Maximum \| Securitized Vacation Ownership Notes Receivable
Future Minimum Payments Receivable [Line Items]
Time-sharing Transactions, Stated Interest Rate for Notes Receivable	15.90%
Originated
Future Minimum Payments Receivable [Line Items]
2020	$ 44
2021	166
2022	164
2023	160
2024	167
Thereafter	875
Total Vacation ownership notes receivable, net of reserve	1,576
Originated \| Non-Securitized
Future Minimum Payments Receivable [Line Items]
2020	10
2021	31
2022	26
2023	21
2024	19
Thereafter	121
Total Vacation ownership notes receivable, net of reserve	228
Originated \| Securitized Vacation Ownership Notes Receivable
Future Minimum Payments Receivable [Line Items]
2020	34
2021	135
2022	138
2023	139
2024	148
Thereafter	754
Total Vacation ownership notes receivable, net of reserve	$ 1,348
Originated \| Weighted Average
Future Minimum Payments Receivable [Line Items]
Time-sharing Transactions, Stated Interest Rate for Notes Receivable	12.60%
Originated \| Weighted Average \| Non-Securitized
Future Minimum Payments Receivable [Line Items]
Time-sharing Transactions, Stated Interest Rate for Notes Receivable	12.30%
Originated \| Weighted Average \| Securitized Vacation Ownership Notes Receivable
Future Minimum Payments Receivable [Line Items]
Time-sharing Transactions, Stated Interest Rate for Notes Receivable	12.70%
Originated \| Minimum
Future Minimum Payments Receivable [Line Items]
Time-sharing Transactions, Stated Interest Rate for Notes Receivable	0.00%
Originated \| Minimum \| Non-Securitized
Future Minimum Payments Receivable [Line Items]
Time-sharing Transactions, Stated Interest Rate for Notes Receivable	0.00%
Originated \| Minimum \| Securitized Vacation Ownership Notes Receivable
Future Minimum Payments Receivable [Line Items]
Time-sharing Transactions, Stated Interest Rate for Notes Receivable	0.00%
Originated \| Maximum
Future Minimum Payments Receivable [Line Items]
Time-sharing Transactions, Stated Interest Rate for Notes Receivable	18.00%
Originated \| Maximum \| Non-Securitized
Future Minimum Payments Receivable [Line Items]
Time-sharing Transactions, Stated Interest Rate for Notes Receivable	18.00%
Originated \| Maximum \| Securitized Vacation Ownership Notes Receivable
Future Minimum Payments Receivable [Line Items]
Time-sharing Transactions, Stated Interest Rate for Notes Receivable	17.50%

Amount of notes receivable related to time share sales, net of allowance for uncollectible accounts and deferred profit.

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 978
-SubTopic 310
-Section 50
-Paragraph 1
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=68077313&loc=d3e27327-108691

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Amount, before allowance for uncollectible account, of notes receivable for time-sharing transaction maturing in fourth fiscal year following current fiscal year. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach).

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 978
-SubTopic 310
-Section 50
-Paragraph 1
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=68077313&loc=d3e27327-108691

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Amount, before allowance for uncollectible account, of notes receivable for time-sharing transaction maturing in next fiscal year following current fiscal year. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach).

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Amount, before allowance for uncollectible account, of notes receivable for time-sharing transaction maturing in third fiscal year following current fiscal year. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach).

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Amount, before allowance for uncollectible account, of notes receivable for time-sharing transaction maturing in second fiscal year following current fiscal year. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach).

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- Definition

Stated interest rate of notes receivable from time-sharing transactions.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 978
-SubTopic 310
-Section 50
-Paragraph 1
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=68077313&loc=d3e27327-108691

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- Definition

Time-Sharing Transaction, Notes Receivable, Maturity, after Year Four

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- Definition

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