Revenue Recognition (Performance Obligations) (Details) - USD ($)
$ in Millions

Mar. 31, 2026

Dec. 31, 2025

Mar. 31, 2025

Dec. 31, 2024

Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]

Contract with Customer, Liability

$ 479

$ 469

$ 487

$ 459

Deferred subscription revenue

Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]

Contract with Customer, Liability

151

147

Deferred VOI trial package revenue

Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]

Contract with Customer, Liability

137

138

Deferred VOI incentive revenue

Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]

Contract with Customer, Liability

88

90

Deferred exchange-related revenue

Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]

Contract with Customer, Liability

^[1]

58

57

Deferred co-branded credit card programs revenue

Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]

Contract with Customer, Liability

34

36

Deferred other revenue

Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]

Contract with Customer, Liability

11

$ 1

Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2026-04-01

Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]

Remaining performance obligations

$ 369

Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Period

1 year

Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2026-04-01 | Deferred subscription revenue

Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]

Remaining performance obligations

$ 86

Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Period

1 year

Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2026-04-01 | Deferred VOI trial package revenue

Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]

Remaining performance obligations

$ 125

Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Period

1 year

Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2026-04-01 | Deferred VOI incentive revenue

Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]

Remaining performance obligations

$ 88

Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Period

1 year

Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2026-04-01 | Deferred exchange-related revenue

Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]

Remaining performance obligations

$ 55

Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Period

1 year

Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2026-04-01 | Deferred co-branded credit card programs revenue

Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]

Remaining performance obligations

$ 4

Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Period

1 year

Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2026-04-01 | Deferred other revenue

Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]

Remaining performance obligations

$ 11

Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Period

1 year

Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2027-04-01

Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]

Remaining performance obligations

$ 42

Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Period

1 year

Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2027-04-01 | Deferred subscription revenue

Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]

Remaining performance obligations

$ 32

Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Period

1 year

Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2027-04-01 | Deferred VOI trial package revenue

Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]

Remaining performance obligations

$ 4

Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Period

1 year

Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2027-04-01 | Deferred VOI incentive revenue

Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]

Remaining performance obligations

$ 0

Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Period

1 year

Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2027-04-01 | Deferred exchange-related revenue

Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]

Remaining performance obligations

$ 2

Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Period

1 year

Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2027-04-01 | Deferred co-branded credit card programs revenue

Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]

Remaining performance obligations

$ 4

Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Period

1 year

Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2027-04-01 | Deferred other revenue

Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]

Remaining performance obligations

$ 0

Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Period

1 year

Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2028-04-01

Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]

Remaining performance obligations

$ 24

Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Period

1 year

Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2028-04-01 | Deferred subscription revenue

Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]

Remaining performance obligations

$ 15

Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Period

1 year

Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2028-04-01 | Deferred VOI trial package revenue

Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]

Remaining performance obligations

$ 4

Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Period

1 year

Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2028-04-01 | Deferred VOI incentive revenue

Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]

Remaining performance obligations

$ 0

Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Period

1 year

Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2028-04-01 | Deferred exchange-related revenue

Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]

Remaining performance obligations

$ 1

Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Period

1 year

Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2028-04-01 | Deferred co-branded credit card programs revenue

Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]

Remaining performance obligations

$ 4

Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Period

1 year

Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2028-04-01 | Deferred other revenue

Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]

Remaining performance obligations

$ 0

Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Period

1 year

Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2029-04-01

Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]

Remaining performance obligations

$ 44

Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Period

1 year

Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2029-04-01 | Deferred subscription revenue

Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]

Remaining performance obligations

$ 18

Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Period

1 year

Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2029-04-01 | Deferred VOI trial package revenue

Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]

Remaining performance obligations

$ 4

Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Period

1 year

Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2029-04-01 | Deferred VOI incentive revenue

Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]

Remaining performance obligations

$ 0

Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Period

1 year

Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2029-04-01 | Deferred exchange-related revenue

Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]

Remaining performance obligations

$ 0

Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Period

1 year

Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2029-04-01 | Deferred co-branded credit card programs revenue

Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]

Remaining performance obligations

$ 22

Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Period

1 year

Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2029-04-01 | Deferred other revenue

Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]

Remaining performance obligations

$ 0

Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Period

1 year

[1]

Includes contractual liabilities to accommodate members for cancellations initiated by the Company due to unexpected events. As of both March 31, 2026 and December 31, 2025, there were $1 million of these contractual liabilities included within Accrued expenses and other liabilities on the Condensed Consolidated Balance Sheets.