Investments (Investee Summarized Financial Information) (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2012	Mar. 31, 2011
Subsidiary or Equity Method Investee [Line Items]
Revenues	$ 323	$ 237
Operating Expenses	(745)	(884)
Operating loss	(422)	(647)
Net loss from continuing operations before non-controlling interests	(561)	(793)
Net loss from discontinued operations before non-controlling interests	$ 1	$ (41)