Income Taxes Level 4 (Details) - Domestic and Foreign Components of Income Continuing Operations (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Income Tax Examination [Line Items]
Domestic	$ 64	$ 101	$ 297
Foreign	(121)	1	(55)
Net income from continuing operations	346	115	215
Income (Loss) from Continuing Operations before Equity Method Investments, Income Taxes, Extraordinary Items, Noncontrolling Interest	$ (57)	$ 102	$ 242