Commitments And Contingencies (Narrative) (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Commitments And Contingencies [Abstract]
Lease obligations, latest maturity date	2021
Lease rental expense	$ 67	$ 48	$ 47
Number of lawsuits filed by cities, counties and states involving hotel occupancy taxes	79
Number of lawsuits dismissed to date	25
Number of dismissals based on finding that defendant was not subject to local hotel occupancy tax or the local government lacked standing to pursue claims	13
Reserve for potential settlement of issues related to hotel occupancy taxes	32	24
Accrual related to court decisions and final settlements related to hotel occupancy taxes	10	13
Occupancy tax assessments including interest and penalties		3	48
Proceeds from exchange for a letter of credit	3
Increase in remaining settlement liability related to class action lawsuit	2	3
Estimated settlement cost			$ 19

Accrual related to court decisions and final settlements related to hotel occupancy taxes.

No definition available.

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- Definition

Dismissal findings.

+ References

No definition available.

+ Details

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- Definition

Number of municipal lawsuits dismissed to date

+ References

No definition available.

+ Details

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- Definition

This element represents the number of lawsuits in which the reporting entity was involved.

+ References

No definition available.

+ Details

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- Definition

Represents tax assessment issued by the tax authority including interest and penalties.

+ References

No definition available.

+ Details

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- Definition

Rental expense incurred for leased assets including furniture and equipment which has not been recognized in costs and expenses applicable to sales and revenues; for example, cost of goods sold or other operating costs and expenses.

+ References

No definition available.

+ Details

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Balance Type:	debit
Period Type:	duration

- Definition

The date upon which a lease or a group of leases is set to expire.

+ References

No definition available.

+ Details

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- Definition

The carrying amount as of the balance sheet date of the combined total of loss contingency liabilities.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 5

-Paragraph 9, 10, 11, 12

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-Topic 450

-SubTopic 20

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- Definition

The increase (decrease) in the period in loss contingency liabilities.

+ References

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- Definition

Reflects the estimated amount of loss from the specified contingency as of the balance sheet date.

+ References

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-Paragraph 9, 10, 11, 12

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- Definition

The cash inflow from a contractual arrangement with the lender, including letter of credit, standby letter of credit and revolving credit arrangements, under which borrowings can be made up to a specific amount at any point in time with either short term or long term maturity that is collateralized (backed by pledge, mortgage or other lien in the entity's assets).

+ References

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