Investments (Investee Summarized Financial Information) (Details) (USD $) In Millions, unless otherwise specified	0 Months Ended	3 Months Ended	6 Months Ended	9 Months Ended
	Jul. 10, 2013	Sep. 30, 2012	Jul. 09, 2013	Sep. 30, 2012
Subsidiary or Equity Method Investee [Line Items]
Revenues	$ 31	$ 314	$ 666	$ 954
Operating Expenses	(62)	(647)	(1,285)	(2,020)
Operating loss	(31)	(333)	(619)	(1,066)
Net loss from continuing operations before non-controlling interests	(31)	(320)	(909)	(1,312)
Net loss from discontinued operations before non-controlling interests	$ 0	$ (173)	$ 0	$ (179)