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Network
2413403 - Disclosure - Stock-Based Compensation (Summary Of Nonvested Shares) (Details)
(http://www.ameren.com/role/StockBasedCompensationSummaryOfNonvestedSharesDetails)
TableSchedule of Share-based Compensation Arrangements by Share-based Payment Award [Table]
Slicers (applies to each fact value in each table cell)
Reporting Entity [Axis]0001002910 (http://www.sec.gov/CIK)
Award Type [Axis]Performance Share Units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]Period [Axis]
2016-01-01 - 2016-12-31
2015-01-01 - 2015-12-31
2014-01-01 - 2014-12-31
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]
 
 
 
Share Units, Nonvested at beginning of year
1,024,870  
  
Share Units, Granted
588,615 1
  
Share Units, Unearned or forfeited
(15,949) 
  
Share Units, Earned and vested
(537,897)2
  
Share Units, Nonvested at end of year
1,059,639  
 
1,024,870  
 
 
 
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Roll Forward]
 
 
 
Weighted-average Fair Value per Unit, Nonvested at beginning of year
46.08  
  
Weighted-averageFair Value per Unit, granted
44.13 1
52.88  
38.90  
Weighted-average Fair Value per Unit, Unearned or forfeited
45.07  
  
Weighted-average Fair Value per Unit, Earned and vested
40.12 2
  
Weighted-average Fair Value per Unit, Nonvested at end of year
48.04  
46.08  
 
1: Includes performance share units (share units) granted to certain executive and nonexecutive officers and other eligible employees in 2016 under the 2014 Incentive Plan.
2: 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.