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Additional Information - Dispositions (Details) (USD $) In Millions, unless otherwise specified	6 Months Ended	1 Months Ended
	Jun. 15, 2012 Entity	Jul. 12, 2012 Subsequent Event
Subsequent Event [Line Items]
Number of joint ventures merged before sale	2
Proceeds from sale of interest in joint venture		$ 90
Expected recognition of deferred revenue		5
Expected gain on sale of interest in joint venture		$ 40

The cash inflow associated with the sale of equity method investments, which are investments in joint ventures and entities in which the entity has an equity ownership interest normally of 20 to 50 percent and exercises significant influence.

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