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

(b) 
$
6

 
$
650

(b) 
Liabilities settled
(1
)
 
(c)

 
(1
)
 
Accretion(d)
13

 
(c)

 
13

 
Change in estimates(e)
(12
)
 
(1
)
 
(13
)
 
Balance at June 30, 2017
$
644

(b) 
$
5

 
$
649

(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 December 31, 2016 and June 30, 2017, respectively.
(c)
Less than $1 million.
(d)
Accretion expense was recorded as a decrease to regulatory liabilities.
(e)
Ameren Missouri changed its fair value estimate primarily related to extending the remediation period of certain CCR storage facilities.
Summary Of Nonvested Shares Related To Long-Term Incentive Plan
A summary of nonvested performance share units at June 30, 2017, and changes during the six months ended June 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)
498,940

 
59.16

Forfeitures
(38,521
)
 
52.40

Vested(b)
(5,992
)
 
52.88

Nonvested at June 30, 2017
1,514,066

 
$
51.57

(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 six months ended June 30, 2017 and 2016:
 
Three Months
 
 
Six Months
 
2017
 
2016
 
 
2017
 
2016
Ameren Missouri
$
40

 
$
40

 
 
$
71

 
$
70

Ameren Illinois
11

 
11

 
 
30

 
31

Ameren
$
51

 
$
51

 
 
$
101

 
$
101