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Company's debt assumed by buyer in sale of interest in consolidated joint venture.

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The net gain or loss resulting from the sale, transfer, termination, or other disposition of assets during the period as well as the aggregate amount of write-downs for impairments recognized during the period for long-lived assets held for sale.

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Loss recognized in discontinued operations from sale of interest in consolidated joint venture.

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Net cash proceeds from disposal of wholly owned hotel.

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Number of wholly owned hotels sold.

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This item represents an other than temporary decline in value that has been recognized against an investment accounted for under the equity method of accounting. The excess of the carrying amount over the fair value of the investment represents the amount of the write down which is or was reflected in earnings. The written down value is a new cost basis with the adjusted value of the investment becoming its new carrying value subject to the equity accounting method. Evidence of a loss in value might include, but would not necessarily be limited to, absence of an ability to recover the carrying amount of the investment or inability of the investee to sustain an earnings capacity which would justify the carrying amount of the investment.

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The gains (losses) included in earnings resulting from the sale or disposal of tangible assets. This item does not include any gain (loss) recognized on the sale of oil and gas property or timber property.

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The cash inflow from the sale of an investment interest in a joint venture that the reporting entity has not previously accounted for using consolidation or the equity method of accounting.

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Cash received from sales of assets, other than those represented by other elements (securities, loans, mortgages, real estate).

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Asset Dispositions and Impairments (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended			6 Months Ended		3 Months Ended
	Jun. 30, 2012	Mar. 31, 2012 Hotel	Jun. 30, 2011 Hotel	Jun. 30, 2012	Jun. 30, 2011	Mar. 31, 2011 Minority Investment - Japan Hotel [Member]
Asset Dispositions and Impairments (Textual) [Abstract]
Impairment loss relating to minority investment in a joint venture hotel located in Japan						$ 32
Asset Dispositions and Impairments (Additional Textual) [Abstract]
Net cash proceeds from disposal of wholly-owned hotel		11	237
Loss recognized on sale of wholly owned hotel	(1)	7	2	(8)	(31)
Approximate proceeds from sale of non-core assets			2
Approximate amount of gain from sale of non-core assets			2
Proceeds from Divestiture of Interest in Joint Venture			44
Company's debt assumed by buyer in sale of interest in consolidated joint venture			57
Number of wholly owned hotels sold		1	2
Loss recognized in discontinued operations from sale of interest in a consolidated joint venture, net of tax			$ 18		$ 18