Employee stock purchase plan espp compensation expense.

No definition available.

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- Definition

Percentage of exercise price per share of stock options over fair market value of common share.

+ References

No definition available.

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- Definition

Amount of expense for award under share-based payment arrangement. Excludes amount capitalized.

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- Definition

Aggregate number of common shares reserved for future issuance.

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- Definition

Amount of cost not yet recognized for nonvested award under share-based payment arrangement.

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- Definition

Weighted-average period over which cost not yet recognized is expected to be recognized for award under share-based payment arrangement, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days.

+ References

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- Definition

Period over which grantee's right to exercise award under share-based payment arrangement is no longer contingent on satisfaction of service or performance condition, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. Includes, but is not limited to, combination of market, performance or service condition.

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- Definition

The number of grants made during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).

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- Definition

The weighted average fair value at grant date for nonvested equity-based awards issued during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).

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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

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- Definition

The number of shares into which fully or partially vested stock options outstanding as of the balance sheet date can be currently converted under the option plan.

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- Definition

Gross number of share options (or share units) granted during the period.

+ References

No definition available.

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- Definition

The weighted average grant-date fair value of options granted during the reporting period as calculated by applying the disclosed option pricing methodology.

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- Definition

Weighted average per share amount at which grantees can acquire shares of common stock by exercise of options.

+ References

No definition available.

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- Definition

Percentage of vesting of award under share-based payment arrangement.

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- Definition

Number of shares issued during the period as a result of an employee stock purchase plan.

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Share-Based Compensation - Additional Information (Details) - USD ($) $ / shares in Units, $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Allocated share-based compensation expense	$ 14	$ 6	$ 18	$ 4
Unrecognized compensation costs for unvested awards	$ 35		$ 35
Unrecognized compensation costs, weighted average period for recognition			1 year 7 months 6 days
Shares of common stock available for future issuance	4,026,124		4,026,124
2017 Employees Stock Purchase Plan
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Maximum shares of common stock issued under ESPP			2,500,000
Minimum \| 2017 Employees Stock Purchase Plan
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Percentage of fair market value per share of common stock			95.00%
Maximum \| 2017 Employees Stock Purchase Plan
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Compensation expense related to ESPP	$ 1	$ 1	$ 1	$ 1
Performance Shares
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Shares issued (in shares)			124,711
Grant date fair value (in dollars per share)			$ 38.22
Award vesting period			3 years
Performance Shares \| Tranche One
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Award vesting percentage			50.00%
Performance Shares \| VOI sale \| Tranche Two
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Award vesting percentage			50.00%
Service Restricted Stock Units (RSUs)
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Shares issued (in shares)			583,077
Grant date fair value (in dollars per share)			$ 38.46
Service Restricted Stock Units (RSUs) \| Minimum
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Award vesting period			3 years
Stock Options
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Shares issued (in shares)			542,793
Exercise price (in dollars per share)			$ 38.22
Grant date fair value (in dollars per share)			$ 13.30
Stock options exercisable (in shares)	1,264,836		1,264,836
Stock Options \| Minimum
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Award vesting period			3 years