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Related Party Transactions (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Related Party Transactions (Additional Textual) [Abstract]
Outstanding advisory fee payable	$ 32	$ 37	$ 42
Blackstone [Member]
Related Party Transactions (Textual) [Abstract]
Paid for advisory and consulting services	2	8
Amount of loan to ultimate parent			9
Accrued interest on loan, rate			9.50%
Hilton Hotels Corporation [Member]
Related Party Transactions (Textual) [Abstract]
Revenue from GDS booking fees received	23
Wyndham Hotel Group [Member]
Related Party Transactions (Textual) [Abstract]
Revenue from GDS booking fees received	9
Transaction and Monitoring Fee Agreement [Member]
Related Party Transactions (Textual) [Abstract]
Payments made under the new Transaction and Monitoring Fee Agreement	$ 5	$ 5	$ 7

Amounts due from parties associated with the reporting entity as evidenced by a written promise to pay, due within 1 year (or 1 business cycle).

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- Definition

Amount of transactions with related party during the financial reporting period.

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- Definition

Amount of revenue, fees and commissions earned from transactions between (a) a parent company and its subsidiaries; (b) subsidiaries of a common parent; (c) an entity and trusts for the benefit of employees, for example, but not limited to, pension and profit-sharing trusts that are managed by or under the trusteeship of the entity's management; (d) an entity and its principal, owners, management, or members of their immediate families; and (e) affiliates.

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