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Schedule I - Condensed Financial Information Of Parent (Restatements) (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Net cash provided by operating activities	$ 1,878	$ 1,823	$ 1,967
Net cash used in investing activities	(1,048)	(1,096)	(1,781)
Parent Company [Member]
Net cash provided by operating activities	804	241	270
Net cash used in investing activities	(14)	248	(1,243)
Previously Reported [Member]
Net cash provided by operating activities		522	442
Net cash used in investing activities		33	531
Restatement Adjustment [Member]
Net cash provided by operating activities		241	270
Net cash used in investing activities		$ 248	$ 1,243

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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