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Investments (Investee Summarized Financial Information) (Details) (USD $)
In Millions, unless otherwise specified
3 Months Ended
Mar. 31, 2013
Mar. 31, 2012
Subsidiary or Equity Method Investee [Line Items]    
Revenues $ 318 $ 323
Operating Expenses (622) (745)
Operating loss (304) (422)
Net loss from continuing operations before non-controlling interests (462) (561)
Net loss from discontinued operations before non-controlling interests $ 0 $ 1