Income Taxes (Narrative) (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended			9 Months Ended		12 Months Ended
	Sep. 30, 2011	Jun. 30, 2011	Sep. 30, 2010	Sep. 30, 2011	Sep. 30, 2010	Dec. 31, 2010
Income Taxes
Consolidated effective tax rates from continuing operations	40.70%		(40.00%)	37.60%	29.40%
Additional state income tax expense (benefit) after tax	$ 2	$ (17)
Deferred tax liabilities			2		2
Deferred tax benefits			2		2
Non-recurring tax benefits						16
Recognized state apportionment factor benefits						8
Reversal of permanent tax benefits		22		22
Valuation allowances on deferred tax assets						8
Adjustment to accrued interest on uncertain tax positions			$ 6		$ 6