Timeshare Financing Receivables - Schedule of Timeshare Financing Receivables (Details) - USD ($) $ in Millions	Sep. 30, 2021		Dec. 31, 2020		Sep. 30, 2020	Dec. 31, 2019
Accounts Notes And Loans Receivable [Line Items]
Timeshare financing receivables	$ 1,151
Timeshare financing receivables, net	1,767		$ 974
Originated
Accounts Notes And Loans Receivable [Line Items]
Securitized	629	[1]	805
Unsecuritized	641		380	[1]
Timeshare financing receivables	1,270		1,185
Unamortized non-credit acquisition preminum	69
Less: allowance for financing receivables losses	(238)		(211)		$ (217)	$ (184)
Timeshare financing receivables, net	1,032		974
Acquired
Accounts Notes And Loans Receivable [Line Items]
Securitized	605	[2]
Unsecuritized	530	[1],[2]
Timeshare financing receivables	1,135	[2]
Unamortized non-credit acquisition preminum	62	[2],[3]
Less: allowance for financing receivables losses	(462)	[2]			$ 0	$ 0
Timeshare financing receivables, net	$ 735	[2]

[1] Includes amounts used as collateral to secure a non-recourse revolving timeshare receivable credit facility ("Timeshare Facility") as well as amounts held as future collateral for securitization activities.

[2] Acquired timeshare financing receivables include all timeshare financing receivables of Legacy-Diamond as of the Acquisition Date. Originated timeshare financing receivables include all Legacy-HGV timeshare financing receivables and Legacy-Diamond timeshare financing receivables originated after the Acquisition Date.

[3] Non-credit premium of $69 million was recognized at the Acquisition Date, of which $62 million remains unamortized as of September 30, 2021.