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Summary Of Significant Accounting Policies (Tables)
 9 Months Ended
Sep. 30, 2017
Accounting Policies [Abstract]  
Asset Retirement Obligation Disclosure
The following table provides a reconciliation of the beginning and ending carrying amount of AROs for the nine months ended September 30, 2017:
 
Ameren
Missouri
 
Ameren
Illinois(a)
 
Ameren
 
Balance at December 31, 2016
$
644

(b) 
$
6

 
$
650

(b) 
Liabilities settled
(4
)
 
(1
)
 
(5
)
 
Accretion(c)
20

 
(d)

 
20

 
Change in estimates(e)
(18
)
 
(1
)
 
(19
)
 
Balance at September 30, 2017
$
642

(b) 
$
4

 
$
646

(b) 
(a)
Included in “Other deferred credits and liabilities” on the balance sheet.
(b)
Balance included $15 million in “Other current liabilities” on the balance sheet as of both December 31, 2016 and September 30, 2017, respectively.
(c)
Accretion expense was recorded as a decrease to regulatory liabilities.
(d)
Less than $1 million.
(e)
Ameren Missouri changed its fair value estimate primarily due to an extension of the remediation period of certain CCR storage facilities, an update to the decommissioning of the Callaway energy center to reflect the cost study and funding analysis filed with the MoPSC in 2017, and an increase in the discount rate assumption.
Summary Of Nonvested Shares Related To Long-Term Incentive Plan
A summary of nonvested performance share units at September 30, 2017, and changes during the nine months ended September 30, 2017, under the 2014 Incentive Plan are presented below:
 
Performance Share Units
 
Share Units
 
Weighted-average Fair Value per Share Unit
Nonvested at January 1, 2017
1,059,639

 
$
48.04

Granted(a)
500,943

 
59.16

Forfeitures
(48,661
)
 
52.54

Vested(b)
(27,446
)
 
52.88

Nonvested at September 30, 2017
1,484,475

 
$
51.55

(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 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 – Natural gas” and “Operating Expenses – Taxes other than income taxes” for the three and nine months ended September 30, 2017 and 2016:
 
Three Months
 
 
Nine Months
 
2017
 
2016
 
 
2017
 
2016
Ameren Missouri
$
51

 
$
52

 
 
$
122

 
$
122

Ameren Illinois
10

 
9

 
 
40

 
40

Ameren
$
61

 
$
61

 
 
$
162

 
$
162