Income Taxes (Income (Loss) From Operations Before Provision (Benefit) For Income Tax) (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Income (Loss) From Operations Before Provision (Benefit) For Income Taxes [Line Items]
Income (loss) from operations before provision (benefit) for income taxes	$ (2,239)	$ (95)	$ 1,217
Domestic [Member]
Income (Loss) From Operations Before Provision (Benefit) For Income Taxes [Line Items]
Income (loss) from operations before provision (benefit) for income taxes	(2,231)	(146)	1,100
Foreign [Member]
Income (Loss) From Operations Before Provision (Benefit) For Income Taxes [Line Items]
Income (loss) from operations before provision (benefit) for income taxes	$ (8)	$ 51	$ 117