Rendering

Component: (Network and Table)
Network
2313301 - Disclosure - Stock-Based Compensation (Tables)
(http://www.ameren.com/role/StockBasedCompensationTables)
Table(Implied)
Slicers (applies to each fact value in each table cell)
Reporting Entity [Axis]0001002910 (http://www.sec.gov/CIK)
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]Period [Axis]
2016-01-01 - 2016-12-31
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]
 
Summary Of Nonvested Shares Related To Long-Term Incentive Plan
A summary of nonvested performance share units at December 31, 2016, and changes during the year ended December 31, 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)
588,615

 
44.13

Forfeitures
(15,949
)
 
45.07

Earned and vested(b)
(537,897
)
 
40.12

Nonvested at December 31, 2016
1,059,639

 
$
48.04

(a)
Includes performance share units (share units) granted to certain executive and nonexecutive officers and other eligible employees in 2016 under the 2014 Incentive Plan.
(b)
Includes share units granted in 2014 that vested as of December 31, 2016 and were earned pursuant to the terms of the award grants. Also includes share units that vested due to 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.
  
Disclosure of Share-based Compensation Arrangements by Share-based Payment Award [Table Text Block]
The following table presents the stock-based compensation expense for the years ended December 31, 2016, 2015 and 2014:
 
2016
 
2015
 
2014
Ameren Missouri
$
4

 
$
5

 
$
5

Ameren Illinois
2

 
3

 
2

Other(a)
11

 
11

 
12

Ameren
17

 
19

 
19

Less income tax benefit
6

 
7

 
7

Stock-based compensation expense, net
$
11

 
$
12

 
$
12

(a)
Represents compensation expense of employees of Ameren Services. These amounts are not included in the Ameren Missouri and Ameren Illinois amounts above.