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Basis of Presentation (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended			6 Months Ended	9 Months Ended	12 Months Ended
	Mar. 31, 2013	Mar. 31, 2012	Mar. 31, 2012 Cash flow adjustment	Jun. 30, 2012 Cash flow adjustment	Sep. 30, 2012 Cash flow adjustment	Dec. 31, 2012 Cash flow adjustment	Dec. 31, 2011 Cash flow adjustment
Cash provided by operating activities	$ 196	$ 201	$ (15)	$ (29)	$ (44)	$ (57)	$ (53)
Cash provided by financing activities	$ 475	$ 374	$ 15	$ 29	$ 44	$ 57	$ 53

The net cash from (used in) all of the entity's operating activities, including those of discontinued operations, of the reporting entity. Operating activities generally involve producing and delivering goods and providing services. Operating activity cash flows include transactions, adjustments, and changes in value that are not defined as investing or financing activities. While for technical reasons this element has no balance attribute, the default assumption is a debit balance consistent with its label.

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