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Summary Of Significant Accounting Policies (Tables)
 9 Months Ended
Sep. 30, 2013
Accounting Policies [Abstract]  
Schedule of Weighted Average Number of Common Shares Outstanding
The following table presents Ameren’s basic and diluted earnings per share calculations and reconciles the weighted-average number of common shares outstanding to the diluted weighted-average number of common shares outstanding for the three and nine months ended September 30, 2013, and 2012:
 
Three Months
 
Nine Months
 
2013
 
2012
 
2013
 
2012
Net income (loss) attributable to Ameren Corporation:
 
 
 
 
 
 
 
Continuing operations
$
305

 
$
309

 
$
464

 
$
507

Discontinued operations
(3
)
 
65

 
(212
)
 
(325
)
Net income (loss) attributable to Ameren Corporation
$
302

 
$
374

 
$
252

 
$
182

 
 
 
 
 
 
 
 
Average common shares outstanding - basic
242.6

 
242.6

 
242.6

 
242.6

Assumed settlement of performance share units
2.5

 
0.3

 
1.8

 
0.3

Average common shares outstanding - diluted
245.1

 
242.9

 
244.4

 
242.9

 
 
 
 
 
 
 
 
Earnings (loss) per common share – basic:
 
 
 
 
 
 
 
Continuing operations
$
1.26

 
$
1.28

 
$
1.92

 
$
2.09

Discontinued operations
(0.01
)
 
0.26

 
(0.88
)
 
(1.34
)
Earnings (loss) per common share – basic
$
1.25

 
$
1.54

 
$
1.04

 
$
0.75

 
 
 
 
 
 
 
 
Earnings (loss) per common share – diluted:
 
 
 
 
 
 
 
Continuing operations
$
1.25

 
$
1.28

 
$
1.91

 
$
2.09

Discontinued operations
(0.01
)
 
0.26

 
(0.88
)
 
(1.34
)
Earnings (loss) per common share – diluted
$
1.24

 
$
1.54

 
$
1.03

 
$
0.75

 
 
 
 
 
 
 
 
Average performance share units excluded from calculation(a)
—

 
1.0

 
0.1

 
1.0

(a) 
Weighted-average number of performance share units that were excluded from the “Assumed settlement of performance share units” provided above because the performance or market conditions related to the awards had not yet been met.
Summary Of Nonvested Shares Related To Long-Term Incentive Plan
A summary of nonvested performance share units at September 30, 2013, and changes during the nine months ended September 30, 2013, under the 2006 Omnibus Incentive Compensation Plan (2006 Plan) are presented below:
 
Performance Share Units
 
Share Units
Weighted-average Fair Value Per Unit at Grant Date
Nonvested as of January 1, 2013
1,192,487

$
33.56

Granted(a)
837,199

31.19

Forfeitures
(7,757
)
32.66

Vested(b)
(131,960
)
31.30

Nonvested as of September 30, 2013
1,889,969

$
32.67

(a)
Includes performance share units (share units) granted to certain executive and nonexecutive officers and other eligible employees in 2013 under the 2006 Plan.
(b)
Share units vested due to the attainment of 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 Based On Usage Of Renewable Energy Credits And Emission Allowances
The following table presents amortization expense based on usage of renewable energy credits and emission allowances, net of gains from sales, for Ameren, Ameren Missouri, and Ameren Illinois, during the three and nine months ended September 30, 2013, and 2012.
 
 
Three Months
 
Nine Months
 
2013
 
2012
 
2013
 
2012
Ameren Missouri
$
—

 
$
1

 
$
(a)

 
$
1

Ameren Illinois
 
2

 
 
1

 
 
9

 
 
1

Ameren
$
2

 
$
2

 
$
9

 
$
2

(a)
Less than $1 million.
Schedule of Excise Taxes
The following table presents excise taxes recorded in “Operating Revenues - Electric,” “Operating Revenues - Gas” and “Operating Expenses - Taxes other than income taxes” for the three and nine months ended September 30, 2013, and 2012:
 
Three Months
 
Nine Months
 
2013
 
2012
 
2013
 
2012
Ameren Missouri
$
49

 
$
46

 
$
120

 
$
111

Ameren Illinois
10

 
9

 
43

 
37

Ameren
$
59

 
$
55

 
$
163

 
$
148
Schedule of Asset Retirement Obligations
The following table provides a reconciliation of the beginning balance and ending carrying amount of AROs for the nine months ended September 30, 2013:
 
Ameren
Missouri(a)
 
Ameren
Illinois(b)
 
Other(c)
 
Ameren(a)
 
Balance at December 31, 2012
$
346

 
$
3

 
$
26

 
$
375

 
Liabilities incurred
—

 
—

 
—

  
—

 
Liabilities settled
(d)

 
(d)

 
(d)

 
(d)

 
Accretion in 2013(e)
14

 
(d)

 
1

  
15

 
Change in estimates(f)
2

 
(d)

 
(d)

 
2

 
Balance at September 30, 2013
$
362

 
$
3

 
$
27

  
$
392

 
(a)
The nuclear decommissioning trust fund assets of $459 million and $408 million as of September 30, 2013, and December 31, 2012, respectively, were restricted for decommissioning of the Callaway energy center.
(b)
Balance included in “Other deferred credits and liabilities” on the balance sheet.
(c)
Represents amounts for the Meredosia and Hutsonville energy centers. Pursuant to the transaction agreement to divest New AER to IPH, Ameren will retain the AROs associated with the Meredosia and Hutsonville energy centers. See Note 2 - Divestiture Transactions and Discontinued Operations for additional information.
(d)
Less than $1 million.
(e)
Accretion was recorded as an increase to regulatory assets at Ameren Missouri and Ameren Illinois.
(f)
Ameren Missouri changed its fair value estimates for asbestos removal and certain CCR storage facilities.
Equity Changes Attributable To Noncontrolling Interest
A reconciliation of the equity changes attributable to the noncontrolling interests at Ameren for the three and nine months ended September 30, 2013, and 2012, is shown below:
  
Three Months
 
Nine Months
  
2013
 
2012
 
2013
 
2012
Noncontrolling interests, beginning of period (a)
$
151

 
$
145

 
$
151

 
$
149

Net income from continuing operations attributable to noncontrolling interests
2

 
2

 
5

 
5

Net loss from discontinued operations attributable to noncontrolling interests
—

 
(2
)
 
—

 
(6
)
Dividends paid to noncontrolling interest holders
(2
)
 
(2
)
 
(5
)
 
(5
)
Other comprehensive income attributable to noncontrolling interests(b)
—

 
9

 
—

 
9

Noncontrolling interests, end of period (a)
$
151

 
$
152

 
$
151

 
$
152

(a)
Includes the 20% EEI ownership interest not owned by Ameren. The assets and liabilities of EEI were consolidated in Ameren’s balance sheet at a 100% ownership level and were included in “Current assets of discontinued operations” and “Current liabilities of discontinued operations.” The 20% ownership interest not owned by Ameren was included in “Noncontrolling interests” on Ameren’s September 30, 2013, and December 31, 2012 balance sheets. See Note 2 - Divestiture Transactions and Discontinued Operations for additional information.
(b)
Represents the noncontrolling interest of EEI’s pension and other postretirement benefit plan activity, net of income taxes of $-, $6, $-, and $6, respectively.