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Summary Of Significant Accounting Policies (Tables)
 12 Months Ended
Dec. 31, 2015
Accounting Policies [Abstract]  
Schedule Of Materials And Supplies
The following table presents a breakdown of materials and supplies for each of the Ameren Companies at December 31, 2015 and 2014:
 
 
Ameren Missouri
 
Ameren Illinois
 
Ameren
2015
 
 
 
 
 
 
Fuel(a)
 
$
173

 
$
—

 
$
173

Gas stored underground
 
10

 
87

 
97

Other materials and supplies
 
204

 
64

 
268

Total materials and supplies
 
$
387

 
$
151

 
$
538

2014
 
 
 
 
 
 
Fuel(a)
 
$
134

 
$
—

 
$
134

Gas stored underground
 
16

 
111

 
127

Other materials and supplies
 
197

 
66

 
263

Total materials and supplies
 
$
347

 
$
177

 
$
524

(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 rates that were applied to construction projects in 2015, 2014, and 2013:
 
2015
 
2014
 
2013
Ameren Missouri
7
%
 
7
%
 
8
%
Ameren Illinois
6
%
 
2
%
 
8
%
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, 2015 and 2014:
 
Ameren
Missouri
 
Ameren
Illinois
 
Ameren
 
Balance at December 31, 2013
$
366

 
$
3

 
$
369

 
Liabilities incurred
2

 
—

 
2

 
Liabilities settled
(2
)
 
(a)

 
(2
)
 
Accretion in 2014(b)
21

 
(a)

 
21

 
Change in estimates(c)
2

 
4

 
6

 
Balance at December 31, 2014
$
389

 
$
7

(d) 
$
396

 
Liabilities incurred
3

 
—

 
3

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

 
(a)

 
23

 
Change in estimates(e)
203

 
(a)

 
203

 
Balance at December 31, 2015
$
617

(f) 
$
6

(d) 
$
623

(f) 

(a)
Less than $1 million.
(b)
Accretion expense was recorded as an increase to regulatory assets at Ameren Missouri and Ameren Illinois.
(c)
The ARO increase resulted in a corresponding increase recorded to "Property and Plant, Net." Ameren Illinois changed its fair value estimate for asbestos removal.
(d)
Included in “Other deferred credits and liabilities” on the balance sheet.
(e)
The ARO increase resulted in a corresponding increase recorded to "Property and Plant, 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.
(f)
Balance included $5 million in "Other current liabilities" on the balance sheet as of December 31, 2015
Schedule Of Excise Taxes
The following table presents the excise taxes recorded in “Operating Revenues – Electric,” “Operating Revenues – Gas,” and “Operating Expenses – Taxes other than income taxes” for the years ended December 31, 2015, 2014, and 2013:
 
2015
 
2014
 
2013
Ameren Missouri
$
156

 
$
151

 
$
152

Ameren Illinois
57

 
64

 
61

Ameren
$
213

 
$
215

 
$
213
Schedule of Cash Flow, Supplemental Disclosures [Table Text Block]
Supplemental Cash Flow Information
The following table presents additional information regarding Ameren's consolidated statement of cash flows for the years ended December 31, 2015, 2014, and 2013:
 
2015
 
2014
 
2013
Cash paid (refunded) during the year:
Interest
 
 
 
 
 
Continuing operations(a)
$
335

 
$
333

 
$
362

Discontinued operations(b)
—

 
—

 
31

 
$
335

 
$
333

 
$
393

 
 
 
 
 
 
Income taxes, net
 
 
 
 
 
Continuing Operations
$
(17
)
 
$
(41
)
 
$
116

Discontinued Operations
2

 
14

 
(108
)
 
$
(15
)
 
$
(27
)
 
$
8

(a)
Net of $17 million, $18 million, and $20 million capitalized, respectively.
(b)
Net of $- million, $- million, and $17 million capitalized, respectively.