Share-Based Compensation - Additional Information (Details) - USD ($) $ / shares in Units, $ in Millions	3 Months Ended
Mar. 31, 2018	Mar. 31, 2017
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Allocated share-based compensation expense	$ 3	$ 3
Unrecognized compensation costs for unvested awards	$ 25
Unrecognized compensation costs, weighted average period for recognition	2 years 2 months 12 days
Shares of common stock available for future issuance	7,130,779
Restricted Stock Units (RSUs)
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Shares issued (in shares)	259,366
Grant date fair value (in dollars per share)	$ 46.62
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)	305,776
Exercise price (in dollars per share)	$ 46.62
Grant date fair value (in dollars per share)	$ 14.82
Stock options exercisable (in shares)	388,999
Stock Options \| Minimum
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Award vesting period	3 years
Performance Shares
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Shares issued (in shares)	42,095
Grant date fair value (in dollars per share)	$ 46.62
Award vesting period	3 years
Performance Shares \| Tranche One
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Award vesting percentage	70.00%
Performance Shares \| VOI sale \| Tranche Two
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Award vesting percentage	30.00%

Represents the expense recognized during the period arising from equity-based compensation arrangements (for example, shares of stock, unit, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section S99
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Aggregate number of common shares reserved for future issuance.

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Unrecognized cost of unvested share-based compensation awards.

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- Definition

Weighted average period over which unrecognized compensation is expected to be recognized for equity-based compensation plans, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Period which an employee's right to exercise an award is no longer contingent on satisfaction of either a service condition, market condition or a performance condition, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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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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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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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.

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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.

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

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- Definition

Percentage of vesting of share-based compensation awards.

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