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Summary Of Significant Accounting Policies (Tables)
 6 Months Ended
Jun. 30, 2016
Accounting Policies [Abstract]  
Summary Of Nonvested Shares Related To Long-Term Incentive Plan
A summary of nonvested performance share units at June 30, 2016, and changes during the six months ended June 30, 2016, 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
Nonvested at January 1, 2016
1,024,870

 
$
46.08

Granted(a)
584,312

 
44.13

Forfeitures
(15,949
)
 
45.07

Vested(b)
(10,754
)
 
43.44

Nonvested at June 30, 2016
1,582,479

 
$
45.39

(a)
Performance share units granted to certain executive and nonexecutive officers and other eligible employees 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 six months ended June 30, 2016 and 2015:
 
Three Months
 
Six Months
 
2016
 
2015
 
2016
 
2015
Ameren Missouri
$
40

 
$
41

 
$
70

 
$
75

Ameren Illinois
11

 
10

 
31

 
33

Ameren
$
51

 
$
51

 
$
101

 
$
108