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2010 Corporate Reorganization (Tables)
12 Months Ended
Dec. 31, 2010
Discontinued Operations and Disposal Groups [Abstract]  
Schedule of discontinued operations
The following table summarizes the operating results of Ameren Illinois’ former merchant generation subsidiary, AERG, classified as discontinued operations in Ameren Illinois’ statements of income for the year ended December 31, 2010:
Operating revenues
$
274

Operating expenses
201

Operating income
73

Other income
1

Interest charges
14

Income taxes
20

Income from discontinued operations, net of tax
$
40