Other Income And Expenses (Tables)

3 Months Ended

Mar. 31, 2012

Other Income And Expenses [Abstract]

Other Income And Expenses

	Three Months
	2012		2011
Ameren:(a)
Miscellaneous income:
Allowance for equity funds used during construction	$	9	$	6
Interest income on industrial development revenue bonds		7		7
Interest and dividend income		—		1
Other		1		2
Total miscellaneous income	$	17	$	16
Miscellaneous expense:
Donations(b)	$	12	$	2
Other		3		3
Total miscellaneous expense	$	15	$	5
Ameren Missouri:
Miscellaneous income:
Allowance for equity funds used during construction	$	8	$	6
Interest income on industrial development revenue bonds		7		7
Total miscellaneous income	$	15	$	13
Miscellaneous expense:
Donations	$	2	$	1
Other		1		2
Total miscellaneous expense	$	3	$	3
Ameren Illinois:
Miscellaneous income:
Allowance for equity funds used during construction	$	1	$	—
Interest and dividend income		—		1
Other		—		1
Total miscellaneous income	$	1	$	2
Miscellaneous expense:
Donations(b)	$	10	$	—
Other		1		1
Total miscellaneous expense	$	11	$	1

(a) Includes amounts for Ameren registrant and nonregistrant subsidiaries and intercompany eliminations.

(b) Includes Ameren Illinois' one-time $7.5 million donation and $1 million annual donation to the Illinois Science and Energy Innovation Trust and $1 million annual donation for customer assistance programs pursuant to the IEIMA as a result of Ameren Illinois' participation in the formula ratemaking process.