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Summary Of Significant Accounting Policies (Tables)
9 Months Ended
Sep. 30, 2015
Accounting Policies [Abstract]  
Schedule of Change in Asset Retirement Obligation
The following table provides a reconciliation of the beginning and ending carrying amount of AROs for the nine months ended September 30, 2015:
 
Ameren
Missouri
 
Ameren
Illinois(a)
 
Ameren
 
Balance at December 31, 2014
$
389

 
$
7

 
$
396

 
Liabilities incurred(b)
3

 

 
3

 
Liabilities settled
(1
)
 
(c)

 
(1
)
 
Accretion in 2015(d)
17

 
(c)

 
17

 
Change in estimates(e)
182

 
(c)

 
182

 
Balance at September 30, 2015
$
590

 
$
7

 
$
597

 
(a)
Included in “Other deferred credits and liabilities” on the balance sheet.
(b)
Ameren and Ameren Missouri recorded a new ARO of $3 million related to the Callaway energy center’s dry spent fuel storage facility. See Note 10 - Callaway Energy Center for additional information.
(c)
Less than $1 million.
(d)
Accretion expense was recorded as an increase to regulatory assets.
(e)
The ARO increase resulted in a corresponding increase recorded to “Property and Plant, Net.” During 2015, Ameren and Ameren Missouri increased their AROs related to the decommissioning of the Callaway energy center by $99 million to reflect the 2015 cost study and funding analysis filed with the MoPSC, extension of the estimated operating life until 2044, and a reduction in the discount rate assumption. See Note 10 - Callaway Energy Center for additional information. In addition, as a result of new federal regulations, Ameren and Ameren Missouri recorded an increase of $79 million to their AROs associated with CCR storage facilities. See Note 9 - Commitments and Contingencies for additional information. Ameren and Ameren Missouri also increased their AROs by $4 million due to a change in the estimated retirement dates of the Meramec and Rush Island energy centers as a result of the MoPSC’s April 2015 electric rate order.
Summary Of Nonvested Shares Related To Long-Term Incentive Plan
A summary of nonvested performance share units at September 30, 2015, and changes during the nine months ended September 30, 2015, under the 2006 Incentive Plan and the 2014 Incentive Plan are presented below:
 
Number of Performance Share Units
Weighted-average Fair Value Per Performance Share Unit
Nonvested at January 1, 2015
1,162,377

$
35.35

Granted(a)
569,892

52.88

Forfeitures
(1,944
)
34.75

Vested(b)
(92,892
)
45.97

Nonvested at September 30, 2015
1,637,433

$
40.85

(a)
Performance share units granted to certain executive and nonexecutive officers and other eligible employees in 2015 under the 2014 Incentive Plan.
(b)
Performance 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 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, 2015 and 2014:
 
Three Months
 
Nine Months
 
2015
 
2014
 
2015
 
2014
Ameren Missouri
$
52

 
$
47

 
$
127

 
$
120

Ameren Illinois
9

 
9

 
42

 
46

Ameren
$
61

 
$
56

 
$
169

 
$
166

Schedule of Unrecognized Tax Benefits
The following table presents the total amount of reserves for unrecognized tax benefits (detriments) related to uncertain tax positions as of September 30, 2015, and December 31, 2014:
 
September 30, 2015
 
December 31, 2014
Ameren
$

 
$
54

Ameren Missouri

 

Ameren Illinois

 
(1
)
Schedule of Unrecognized Tax Benefits That Would Impact Effective Tax Rate
The following table presents the amount of reserves for unrecognized tax benefits, included in the table above, related to uncertain tax positions that, if recognized, would have impacted results of operations as of December 31, 2014:
 
 
 
December 31, 2014
Ameren

 
$
52

Ameren Missouri

 

Ameren Illinois

 
(1
)