Revenue Recognition (Performance Obligations) (Details) - USD ($) $ in Millions | Mar. 31, 2024 | Dec. 31, 2023 | Mar. 31, 2023 | Dec. 31, 2022 |
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items] | | | | | |
Contract with Customer, Liability | | $ 454 | $ 444 | $ 419 | $ 400 |
Deferred subscription revenue | | | | | |
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items] | | | | | |
Contract with Customer, Liability | | 164 | 161 | | |
Deferred VOI trial package revenue | | | | | |
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items] | | | | | |
Contract with Customer, Liability | | 133 | 136 | | |
Deferred VOI incentive revenue | | | | | |
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items] | | | | | |
Contract with Customer, Liability | | 82 | 81 | | |
Deferred exchange-related revenue | | | | | |
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items] | | | | | |
Contract with Customer, Liability | [1] | 62 | 59 | | |
Deferred co-branded credit card programs revenue | | | | | |
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items] | | | | | |
Contract with Customer, Liability | | 5 | 6 | | |
Deferred other revenue | | | | | |
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items] | | | | | |
Contract with Customer, Liability | | 8 | $ 1 | | |
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2024-04-01 | | | | | |
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items] | | | | | |
Remaining performance obligations | | $ 370 | | | |
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Period | | 1 year | | | |
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2024-04-01 | Deferred subscription revenue | | | | | |
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items] | | | | | |
Remaining performance obligations | | $ 94 | | | |
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Period | | 1 year | | | |
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2024-04-01 | Deferred VOI trial package revenue | | | | | |
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items] | | | | | |
Remaining performance obligations | | $ 124 | | | |
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Period | | 1 year | | | |
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2024-04-01 | Deferred VOI incentive revenue | | | | | |
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items] | | | | | |
Remaining performance obligations | | $ 82 | | | |
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Period | | 1 year | | | |
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2024-04-01 | Deferred exchange-related revenue | | | | | |
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items] | | | | | |
Remaining performance obligations | | $ 59 | | | |
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Period | | 1 year | | | |
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2024-04-01 | Deferred co-branded credit card programs revenue | | | | | |
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items] | | | | | |
Remaining performance obligations | | $ 3 | | | |
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Period | | 1 year | | | |
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2024-04-01 | Deferred other revenue | | | | | |
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items] | | | | | |
Remaining performance obligations | | $ 8 | | | |
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Period | | 1 year | | | |
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2025-04-01 | | | | | |
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items] | | | | | |
Remaining performance obligations | | $ 43 | | | |
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Period | | 1 year | | | |
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2025-04-01 | Deferred subscription revenue | | | | | |
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items] | | | | | |
Remaining performance obligations | | $ 36 | | | |
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Period | | 1 year | | | |
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2025-04-01 | Deferred VOI trial package revenue | | | | | |
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items] | | | | | |
Remaining performance obligations | | $ 3 | | | |
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Period | | 1 year | | | |
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2025-04-01 | 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]: 2025-04-01 | 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]: 2025-04-01 | Deferred co-branded credit card programs 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]: 2025-04-01 | 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]: 2026-04-01 | | | | | |
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items] | | | | | |
Remaining performance obligations | | $ 20 | | | |
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 | | $ 16 | | | |
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 | | $ 3 | | | |
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 | | $ 0 | | | |
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 | | $ 1 | | | |
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 | | $ 0 | | | |
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 | | $ 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 | | | | | |
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items] | | | | | |
Remaining performance obligations | | $ 21 | | | |
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 | | $ 18 | | | |
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 | | $ 3 | | | |
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 | | $ 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 co-branded credit card programs 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 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 | | | |
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[1] Includes contractual liabilities to accommodate members for cancellations due to unexpected events. These amounts are included within Accrued expenses and other liabilities on the Condensed Consolidated Balance Sheets. | |