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Restructuring (Narrative) (Details) $ in Millions	3 Months Ended			9 Months Ended		12 Months Ended
Restructuring (Narrative) (Details) $ in Millions	Sep. 30, 2026 USD ($) resort	Mar. 31, 2026 USD ($) employee	Sep. 30, 2025 USD ($)	Sep. 30, 2026 USD ($) resort	Sep. 30, 2025 USD ($)	Dec. 31, 2025 USD ($) employee
Restructuring Cost and Reserve [Line Items]
Inventory write-downs and impairments				$ 27	$ 6
Asset impairments, net	$ 0		$ 1	0	2
Restructuring charges	12		0	10	0
Cash payments				(21)
Restructuring liability	19			19		$ 28
Personnel-related
Restructuring Cost and Reserve [Line Items]
Restructuring charges				5
Cash payments				(13)
Restructuring liability	8			8		14
Facility related
Restructuring Cost and Reserve [Line Items]
Restructuring charges				0
Cash payments				(1)
Restructuring liability	11			11		12
Other Restructuring
Restructuring Cost and Reserve [Line Items]
Restructuring charges				5
Cash payments				(7)
Restructuring liability	$ 0			0		2
Resort Optimization Initiative
Restructuring Cost and Reserve [Line Items]
Cash payments				$ (2)
Resort Optimization Initiative \| Vacation Ownership
Restructuring Cost and Reserve [Line Items]
Number of Resorts \| resort	17			17
Resort optimization initiative costs	$ 4		7	$ 35	7	233
Restructuring liability	2			2		4
Reimbursable costs	2			2
Resort Optimization Initiative \| Vacation Ownership \| Personnel-related
Restructuring Cost and Reserve [Line Items]
Other Restructuring Costs						9
Restructuring charges				(2)		4
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Resort optimization initiative costs						5
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Restructuring Cost and Reserve [Line Items]
Severance Costs	0			(2)
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Restructuring Cost and Reserve [Line Items]
Asset impairments, net						8
Resort Optimization Initiative \| Vacation Ownership \| Facility related \| Income Statement Location [Axis]: us-gaap:CostOfGoodsAndServicesSold
Restructuring Cost and Reserve [Line Items]
Inventory write-downs and impairments	3		6	14	6
Resort Optimization Initiative \| Vacation Ownership \| Facility related \| Income Statement Location [Axis]: us-gaap:OperatingCostsAndExpenses
Restructuring Cost and Reserve [Line Items]
Resort closure costs	0			5
Resort Optimization Initiative \| Vacation Ownership \| Other Restructuring
Restructuring Cost and Reserve [Line Items]
Inventory write-downs and impairments	2		6	27	6	216
Resort Optimization Initiative \| Vacation Ownership \| Other Restructuring \| Income Statement Location [Axis]: us-gaap:CostOfGoodsAndServicesSold
Restructuring Cost and Reserve [Line Items]
Other	(1)			13
Resort Optimization Initiative \| Vacation Ownership \| Other Restructuring \| Income Statement Location [Axis]: us-gaap:OperatingCostsAndExpenses
Restructuring Cost and Reserve [Line Items]
Other Restructuring Costs	2		$ 1	5	$ 1
Restructuring plan 2025
Restructuring Cost and Reserve [Line Items]
Restructuring charges						$ 15
Restructuring and Related Cost, Number of Positions Eliminated \| employee						250
Cash payments				(12)		$ (3)
Restructuring liability	1			1		12
Restructuring plan 2025 \| Travel and Membership \| Personnel-related
Restructuring Cost and Reserve [Line Items]
Restructuring charges						5
Restructuring plan 2025 \| Travel and Membership \| Contract Termination
Restructuring Cost and Reserve [Line Items]
Restructuring charges						2
Restructuring plan 2025 \| Corporate and Other \| Personnel-related
Restructuring Cost and Reserve [Line Items]
Restructuring charges						7
Restructuring plan 2025 \| Vacation Ownership \| Personnel-related
Restructuring Cost and Reserve [Line Items]
Restructuring charges						1
Restructuring plans prior to 2025
Restructuring Cost and Reserve [Line Items]
Cash payments				(1)
Restructuring liability	11			11		$ 12
Restructuring plan 2026
Restructuring Cost and Reserve [Line Items]
Restructuring charges		$ 12
Restructuring and Related Cost, Number of Positions Eliminated \| employee		300
Cash payments		$ (6)
Restructuring liability	$ 6			$ 6
Restructuring plan 2026 \| Travel and Membership \| Personnel-related
Restructuring Cost and Reserve [Line Items]
Restructuring charges		7
Restructuring plan 2026 \| Corporate and Other \| Contract Termination
Restructuring Cost and Reserve [Line Items]
Restructuring charges		$ 5