Derivative Financial Instruments (Details) (USD $) In Millions	3 Months Ended	6 Months Ended
Jun. 30, 2011	Jun. 30, 2010	Jun. 30, 2011	Jun. 30, 2010	Dec. 31, 2010
Asset Derivatives
Derivative assets designated as hedging instruments	$ 16		$ 16		$ 16
Derivative assets not designated as hedging instruments	0		0		0
Liability Derivatives
Derivative liability designated as hedging instruments	1		1		0
Derivative liability not designated as hedging instruments	3		3		9
Derivative instruments gain (loss) recognized in Other Comprehensive Income
Beginning Balance	2	(1)	0	0
Mark-to-market (gain) loss on forward exchange contracts	1	0	3	(1)
Reclassification of gain (loss) from OCI to management fees, franchise fees, and other income	(1)	1	(1)	1
Ending Balance	2	0	2	0
Interest rate swap [Member] \| Other assets [Member]
Asset Derivatives
Derivative assets designated as hedging instruments	16		16		16
Forward contracts [Member] \| Prepaid and other current assets [Member]
Asset Derivatives
Derivative assets designated as hedging instruments	0		0		0
Derivative assets not designated as hedging instruments	0		0		0
Forward contracts [Member] \| Accrued expenses [Member]
Liability Derivatives
Derivative liability designated as hedging instruments	1		1		0
Derivative liability not designated as hedging instruments	$ 3		$ 3		$ 9

Derivative instruments gain (loss) recognized in Other Comprehensive Income.

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- Definition

Net of tax effect of the reclassification for accumulated gains and losses form derivative instrument designated and qualifying as the effective portion of cash flow hedges included in accumulated comprehensive income that was realized in net income during the period.

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- Definition

Fair value of a derivative asset (or nonderivative instrument) that is designated and qualifies as a hedging instrument, presented on a gross basis even when the derivative instrument is subject to master netting arrangements and qualifies for net presentation in the statement of financial position.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 133
-Paragraph 205G

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 133
-Paragraph 44C
-Subparagraph a
-Clause 1

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- Definition

Fair value of a derivative asset that is not designated or qualifying as a hedging instrument, presented on a gross basis even when the derivative instrument is subject to master netting arrangements and qualifies for net presentation in the statement of financial position.

+ References

+ Details

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- Definition

Fair value of a derivative liability (or nonderivative instrument) that is designated and qualifies as a hedging instrument, presented on a gross basis even when the derivative instrument is subject to master netting arrangements and qualifies for net presentation in the statement of financial position.

+ References

+ Details

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- Definition

Fair value of a derivative liability that is not designated or qualifying as a hedging instrument, presented on a gross basis even when the derivative instrument is subject to master netting arrangements and qualifies for net presentation in the statement of financial position.

+ References

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- Definition

Net of tax effect change in accumulated gains and losses from derivative instruments designated and qualifying as the effective portion of cash flow hedges after taxes. A cash flow hedge is a hedge of the exposure to variability in the cash flows of a recognized asset or liability or a forecasted transaction that is attributable to a particular risk. The change includes an entity's share of an equity investee's increase (decrease) in deferred hedging gains or losses.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 130
-Paragraph 14, 17, 20, 26

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 133
-Paragraph 31, 46

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher AICPA
-Name Accounting Research Bulletin (ARB)
-Number 51
-Paragraph 38
-Subparagraph c(3)

Reference 4: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 133
-Paragraph 46

Reference 5: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 130
-Paragraph 24
-Subparagraph b

Reference 6: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 130
-Paragraph 14, 17, 20, 24, 26

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