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Summary Of Significant Accounting Policies (Tables)
 6 Months Ended
Jun. 30, 2014
Accounting Policies [Abstract]  
Summary Of Nonvested Shares Related To Long-Term Incentive Plan
A summary of nonvested performance share units at June 30, 2014, and changes during the six months ended June 30, 2014, under the 2006 Incentive Plan and the 2014 Incentive Plan are presented below:
 
Performance Share Units
 
Share Units
Weighted-average Fair Value Per Share Unit at Grant Date
Nonvested at January 1, 2014
1,218,544

$
33.23

Granted(a)
683,591

38.90

April Grants(b)
38,559

50.34

Forfeitures
(65,847
)
33.82

Vested(c)
(116,297
)
38.81

Nonvested at June 30, 2014
1,758,550

$
35.42

(a)
Includes performance share units (share units) granted to certain executive and nonexecutive officers and other eligible employees in 2014 under the 2006 Incentive Plan.
(b)
In April 2014, certain executive officers were granted additional share units under the 2006 Incentive Plan and the 2014 Incentive Plan. The significant assumptions used to calculate fair value included a prorated three-year risk-free rate ranging from 0.76% to 0.79%, volatility of 12% to 18% for the peer group, and Ameren’s attainment of a three-year average earnings per share threshold during the performance period.
(c)
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 six months ended June 30, 2014, and 2013:
 
 
Three Months
 
Six Months
 
2014
 
2013
 
2014
 
2013
Ameren Missouri
$
—

 
$
—

 
$
6

 
$
(a)

Ameren Illinois
 
3

 
 
3

 
 
6

 
 
7

Ameren
$
3

 
$
3

 
$
12

 
$
7

(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 six months ended June 30, 2014, and 2013:
 
Three Months
 
Six Months
 
2014
 
2013
 
2014
 
2013
Ameren Missouri
$
39

 
$
38

 
$
73

 
$
71

Ameren Illinois
11

 
11

 
37

 
33

Ameren
$
50

 
$
49

 
$
110

 
$
104
Schedule of Unrecognized Tax Benefits
The following table presents the amount of unrecognized tax benefits (detriments) related to uncertain tax positions as of June 30, 2014, and December 31, 2013:
 
June 30, 2014
 
December 31,
2013
Ameren
$
94

 
$
90

Ameren Missouri
34

 
31

Ameren Illinois
—

 
(1
)
Schedule of Unrecognized Tax Benefits That Would Impact Effective Tax Rate
The following table presents the amount of unrecognized tax benefits (detriments) related to uncertain tax positions as of June 30, 2014, and December 31, 2013, that would impact the effective tax rate, if recognized:
 
June 30, 2014
 
December 31,
2013
Ameren
$
55

 
$
54

Ameren Missouri
3

 
3

Ameren Illinois
(1
)
 
—
Equity Changes Attributable To Noncontrolling Interest
A reconciliation of the equity changes attributable to the noncontrolling interests at Ameren for the three and six months ended June 30, 2014, and 2013, are shown below:
  
Three Months
 
Six Months
 
  
2014
 
2013
 
2014
 
2013
 
Noncontrolling interests, beginning of period
$
142

 
$
151

(a) 
$
142

 
$
151

(a) 
Net income from continuing operations attributable to noncontrolling interests
1

 
1

 
3

 
3

 
Dividends paid to noncontrolling interest holders
(1
)
 
(1
)
 
(3
)
 
(3
)
 
Noncontrolling interests, end of period
$
142

 
$
151

(a) 
$
142

 
$
151

(a) 
(a)
Included the 20% EEI ownership interest not owned by Ameren prior to the divestiture of New AER to IPH. Prior to the divestiture of New AER, the assets and liabilities of EEI were consolidated in Ameren’s balance sheet at a 100% ownership level and were included in “Assets of discontinued operations” and “Liabilities of discontinued operations.” The divestiture of New AER, which included EEI, was completed in the fourth quarter of 2013. See Note 12 - Divestiture Transactions and Discontinued Operations for additional information.