Variable Interest Entities (Assets And Liabilities Of Vacation Ownership SPEs) (Details) - USD ($) $ in Millions		Mar. 31, 2021	Dec. 31, 2020	Mar. 31, 2020
Schedule Of Transfer And Financial Assets [Line Items]
Less: Restricted cash		$ 139	$ 121	$ 153
Other assets		386	387
Total assets		6,728	7,613
Total SPE liabilities		(7,704)	(8,581)
Variable Interest Entity, Primary Beneficiary [Member]
Schedule Of Transfer And Financial Assets [Line Items]
Less: Restricted cash		110	92
Non-recourse term notes		(2,183)	(2,234)
Vacation Ownership SPEs
Schedule Of Transfer And Financial Assets [Line Items]
Deferred financing cost related to securitized debt		23	21
Vacation Ownership SPEs | Variable Interest Entity, Primary Beneficiary [Member]
Schedule Of Transfer And Financial Assets [Line Items]
Securitized contract receivables, gross	[1]	2,313	2,458
Less: Restricted cash	[2]	110	92
Interest receivables on securitized contract receivables	[3]	20	23
Other assets	[4]	5	5
Total assets		2,448	2,578
Other liabilities	[5]	(10)	(2)
Total SPE liabilities		(2,193)	(2,236)
SPE assets in excess of SPE liabilities		255	342
Term Notes [Member] | Vacation Ownership SPEs | Variable Interest Entity, Primary Beneficiary [Member]
Schedule Of Transfer And Financial Assets [Line Items]
Non-recourse term notes	[6],[7]	(1,954)	(1,893)
Non-recourse bank conduit facility [Member]
Schedule Of Transfer And Financial Assets [Line Items]
Non-recourse term notes	[8]	(229)
Non-recourse bank conduit facility [Member] | Vacation Ownership SPEs | Variable Interest Entity, Primary Beneficiary [Member]
Schedule Of Transfer And Financial Assets [Line Items]
Non-recourse term notes	[6]	$ (229)	$ (341)

[1] The Company does not allocate allowance for loan losses to SPEs. This amount is included in Vacation ownership contract receivables, net on the Condensed Consolidated Balance Sheets.

[2] Included in Restricted cash on the Condensed Consolidated Balance Sheets.

[3] Included in Trade receivables, net on the Condensed Consolidated Balance Sheets.

[4] Primarily includes deferred financing costs for the bank conduit facility and a security investment asset, which is included in Other assets on the Condensed Consolidated Balance Sheets.

[5] Primarily includes accrued interest on non-recourse debt, which is included in Accrued expenses and other liabilities on the Condensed Consolidated Balance Sheets.

[6] Included in Non-recourse vacation ownership debt on the Condensed Consolidated Balance Sheets.

[7] Includes deferred financing costs of $23 million and $21 million as of March 31, 2021 and December 31, 2020, related to non-recourse debt.

[8] Consists of the Company’s USD bank conduit facility and AUD/NZD bank conduit facility. The capacity of these facilities is subject to the Company’s ability to provide additional assets to collateralize additional non-recourse borrowings.