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Summary Of Significant Accounting Policies (Tables)
 12 Months Ended
Dec. 31, 2016
Accounting Policies [Abstract]  
Schedule Of Inventories
The following table presents a breakdown of inventories for each of the Ameren Companies at December 31, 2016 and 2015:
 
 
Ameren Missouri
 
Ameren Illinois
 
Ameren
2016
 
 
 
 
 
 
Fuel(a)
 
$
172

 
$
—

 
$
172

Natural gas stored underground
 
9

 
73

 
82

Other inventories
 
211

 
62

 
273

Total inventories
 
$
392

 
$
135

 
$
527

2015
 
 
 
 
 
 
Fuel(a)
 
$
173

 
$
—

 
$
173

Natural gas stored underground
 
10

 
87

 
97

Other inventories
 
204

 
64

 
268

Total inventories
 
$
387

 
$
151

 
$
538

(a)
Consists of coal, oil, and propane.
Schedule Of Rates Used For Allowance For Funds Used During Construction
The following table presents the annual allowance for funds used during construction debt and equity blended rates that were applied to construction projects in 2016, 2015, and 2014:
 
2016
 
2015
 
2014
Ameren Missouri
7
%
 
7
%
 
7
%
Ameren Illinois
5
%
 
6
%
 
2
%
Schedule Of Asset Retirement Obligations
The following table provides a reconciliation of the beginning and ending carrying amount of AROs for the years ended December 31, 2016 and 2015:
 
Ameren
Missouri
 
Ameren
Illinois
 
Ameren
 
Balance at December 31, 2014
$
389

 
$
7

 
$
396

 
Liabilities incurred
3

 
—

 
3

 
Liabilities settled
(1
)
 
(1
)
 
(2
)
 
Accretion in 2015(a)
23

 
(b)

 
23

 
Change in estimates(c)
203

 
(b)

 
203

 
Balance at December 31, 2015
$
617

(e) 
$
6

(d) 
$
623

(e) 
Liabilities incurred
3

 
—

 
3

 
Liabilities settled
(2
)
 
(b)

 
(2
)
 
Accretion in 2016(a)
25

 
(b)

 
25

 
Change in estimates
1

 
—

 
1

 
Balance at December 31, 2016
$
644

(e) 
$
6

(d) 
$
650

(e) 

(a)
Accretion expense was recorded as a decrease to regulatory liabilities.
(b)
Less than $1 million.
(c)
The ARO increase resulted in a corresponding increase recorded to "Property, Plant, and Equipment, Net." Ameren and Ameren Missouri increased their AROs related to the decommissioning of the Callaway energy center by $99 million to reflect the 2015 cost study and funding analysis filed with the MoPSC, the extension of the estimated operating life until 2044, and a reduction in the discount rate assumption. See Note 10 – Callaway Energy Center for additional information. In addition, as a result of new federal regulations, Ameren and Ameren Missouri recorded an increase of $100 million to their AROs associated with CCR storage facilities. See Note 15 – Commitments and Contingencies for additional information. Ameren and Ameren Missouri also increased their AROs by $4 million due to a change in the estimated retirement dates of the Meramec and Rush Island energy centers as a result of the MoPSC's April 2015 electric rate order.
(d)
Included in “Other deferred credits and liabilities” on the balance sheet.
(e)
Balance included $5 million and $15 million in "Other current liabilities" on the balance sheet as of December 31, 2015 and 2016, respectively.
Schedule Of Excise Taxes
The following table presents the excise taxes recorded in “Operating Revenues – Electric,” “Operating Revenues – Natural gas,” and “Operating Expenses – Taxes other than income taxes” for the years ended December 31, 2016, 2015, and 2014:
 
2016
 
2015
 
2014
Ameren Missouri
$
151

 
$
156

 
$
151

Ameren Illinois
57

 
57

 
64

Ameren
$
208

 
$
213

 
$
215