Income Taxes (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2012 M	Mar. 31, 2011
Income Taxes (Textual) [Abstract]
Income from continuing operations pre tax loss	$ 53	$ (16)
Income tax expense	4	13
Anticipation of the reasonably possible change in uncertain tax positions	6
Time limits for tax audit closings, settlements and expiration of applicable statutes of limitations in various jurisdictions	12
State income tax benefit	$ 21