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Summary of Significant Accounting Policies (Tables)

6 Months Ended

Jun. 30, 2011

Summary of Significant Accounting Policies

Long-Term Incentive Plan


		Performance Share Units^(a)								Restricted Shares^(b)
		Share Units				Weighted-average Fair Value Per Unit at Grant Date				Shares				Weighted-average Fair Value Per Share at Grant Date
Nonvested at January 1, 2011			1,142,768			$	23.96				83,154			$	49.87
Granted^(c)			731,962				31.41				-				-
Dividends			-				-				518				28.48
Forfeitures			(10,261	)			26.14				(560	)			50.45
Vested^(d)			(131,343	)			30.67				(63,574	)			49.47
Nonvested at June 30, 2011			1,733,126			$	26.58				19,538			$	51.21

(a)	Granted under the 2006 Plan.

(b)	Granted under the 1998 Plan.

(c)	Includes performance share units (share units) granted to certain executive and nonexecutive officers and other eligible employees in January 2011 under the 2006 Plan.

(d)	Shares/units vested due to Ameren attainment of performance goals and retirement eligibility by certain employees. Actual shares issued for retirement-eligible employees will vary depending on actual performance over the three-year measurement period.

Schedule of Amortization Expense for Intangible Assets


		Three Months								Six Months
		2011				2010				2011				2010
Ameren^(a)		$	1			$	7			$	2			$	10
AMO			-				(b	)			-				(b	)
Genco^(a)			1				5				2				8
AERG^(a)			(b	)			2				(b	)			2

(a)	Includes allowances consumed that were recorded through purchase accounting.

(b)	Less than $1 million.

Schedule of Excise Taxes


		Three Months								Six Months
		2011				2010				2011				2010
Ameren		$	44			$	44			$	95			$	90
AMO			34				33				63				58
AIC			10				11				32				32

Schedule of Noncontrolling Interest


		Three Months								Six Months
		2011				2010				2011				2010
Ameren:
Noncontrolling interest, beginning of period		$	155			$	206			$	154			$	204
Net income attributable to noncontrolling interest			1				3				4				7
Dividends paid to noncontrolling interest holders			(1	)			(3	)			(3	)			(5	)
Noncontrolling interest, end of period		$	155			$	206			$	155			$	206
Genco:
Noncontrolling interest, beginning of period		$	12			$	10			$	11			$	9
Net income attributable to noncontrolling interest			-				1				1				2
Noncontrolling interest, end of period		$	12			$	11			$	12			$	11

- Definition

The entire disclosure for noncontrolling interest in consolidated subsidiaries, which could include the name of the subsidiary, the ownership percentage held by the parent, the ownership percentage held by the noncontrolling owners, the amount of the noncontrolling interest, the location of this amount on the balance sheet (when not reported separately), an explanation of the increase or decrease in the amount of the noncontrolling interest, the noncontrolling interest share of the net Income or Loss of the subsidiary, the location of this amount on the income statement (when not reported separately), the nature of the noncontrolling interest such as background information and terms, the amount of the noncontrolling interest represented by preferred stock, a description of the preferred stock, and the dividend requirements of the preferred stock.

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