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Summary Of Significant Accounting Policies (Tables)
 12 Months Ended
Dec. 31, 2013
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, 2013, and 2012:
 
 
Ameren Missouri
 
Ameren Illinois
 
Ameren
2013
 
 
 
 
 
 
Fuel(a)
 
$
144

 
$
—

 
$
144

Gas stored underground
 
17

 
110

 
127

Other materials and supplies
 
191

 
64

 
255

 
 
$
352

 
$
174

 
$
526

2012
 
 
 
 
 
 
Fuel(a)
 
$
198

 
$
—

 
$
198

Gas stored underground
 
18

 
113

 
131

Other materials and supplies
 
181

 
60

 
241

 
 
$
397

 
$
173

 
$
570

(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 utilized during 2013, 2012 and 2011:
 
2013
 
2012
 
2011
Ameren Missouri
8
%
 
8
%
 
8
%
Ameren Illinois
8
%
 
9
%
 
9
%
Schedule Of Amortization Based On Usage Of Renewable Energy Credits And Emission Allowances
 
 
2013
 
2012
 
2011
Ameren Missouri
$
(a)

$
(a)

$
(a)

Ameren Illinois
 
13

 
4

 
3

Ameren
$
13

$
4

$
3

(a)
Less than $1 million.
Schedule Of Excise Taxes
The following table presents excise taxes recorded in “Operating Revenues – Electric,” “Operating Revenues – Gas,” and “Operating Expenses – Taxes other than income taxes” for the years ended 2013, 2012 and 2011:
 
2013
 
2012
 
2011
Ameren Missouri
$
152

 
$
139

 
$
137

Ameren Illinois
61

 
54

 
57

Ameren
$
213

 
$
193

 
$
194
Schedule of Earnings Per Share, Basic and Diluted
The following table presents Ameren’s basic and diluted earnings per share calculations and reconciles the weighted-average number of common shares outstanding to the diluted weighted-average number of common shares outstanding for the years ended December 31, 2013, 2012 and 2011:
 
2013
 
2012
 
2011
Net income (loss) attributable to Ameren Corporation:
 
 
 
 
 
Continuing operations
$
512

 
$
516

 
$
431

Discontinued operations
(223
)
 
(1,490
)
 
88

Net income (loss) attributable to Ameren Corporation
$
289

 
$
(974
)
 
$
519

 
 
 
 
 
 
Average common shares outstanding – basic
242.6

 
242.6

 
241.5

Assumed settlement of performance share units
1.9

 
0.4

 
0.6

Average common shares outstanding – diluted
244.5

 
243.0

 
242.1

 
 
 
 
 
 
Earnings (loss) per common share – basic:
 
 
 
 
 
Continuing operations
$
2.11

 
$
2.13

 
$
1.79

Discontinued operations
(0.92
)
 
(6.14
)
 
0.36

Earnings (loss) per common share – basic
$
1.19

 
$
(4.01
)
 
$
2.15

 
 
 
 
 
 
Earnings (loss) per common share – diluted:
 
 
 
 
 
Continuing operations
$
2.10

 
$
2.13

 
$
1.79

Discontinued operations
(0.92
)
 
(6.14
)
 
0.36

Earnings (loss) per common share – diluted
$
1.18

 
$
(4.01
)
 
$
2.15

 
 
 
 
 
 
Average performance share units excluded from calculation(a)
0.1

 
0.7

 
—

(a)
Weighted-average number of performance share units that were excluded from the “Assumed settlement of performance share units” provided above because the performance or market conditions related to the awards had not yet been met.
Schedule of Cash Flow, Supplemental Disclosures [Table Text Block]
The following table presents additional information regarding Ameren's consolidated statement of cash flows for the years ended December 31, 2013, 2012 and 2011:
 
2013
 
2012
 
2011
Cash paid (refunded) during the year:

 
 
 
 
 
Interest
 
 
 
 
 
Continuing operations(a)
$
362

 
$
384

 
$
393

Discontinued operations(b)
31

 
49

 
60

 
$
393

 
$
433

 
$
453

 
 
 
 
 
 
Income taxes, net
 
 
 
 
 
Continuing Operations
$
116

 
$
10

 
$
(47
)
Discontinued Operations
(108
)
 
(9
)
 
(14
)
 
$
8

 
$
1

 
$
(61
)
(a)
Net of $20 million, $17 million, and $27 million capitalized, respectively.
(b)
Net of $17 million, $13 million, and $3 million capitalized, respectively.
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, 2013, and 2012:
 
Ameren
Missouri(a)
 
Ameren
Illinois(b)
 
Ameren(a)
 
Balance at December 31, 2011
$
328

 
$
3

 
$
331

 
Liabilities incurred
—

 
—

 
—

 
Liabilities settled
(1
)
 
(c)

 
(1
)
 
Accretion in 2012(d)
18

 
(c)

 
18

 
Change in estimates(e)
1

 
(c)

 
1

 
Balance at December 31, 2012
$
346

 
$
3

 
$
349

 
Liabilities incurred
—

 
—

 
—

 
Liabilities settled
(1
)
 
(c)

 
(1
)
 
Accretion in 2013(d)
19

 
(c)

 
19

 
Change in estimates(e)
2

 
(c)

 
2

 
Balance at December 31, 2013
$
366

 
$
3

 
$
369

 
(a)
The nuclear decommissioning trust fund assets of $494 million and $408 million as of December 31, 2013, and 2012, respectively, are restricted for decommissioning of the Callaway energy center.
(b)
Balance included in “Other deferred credits and liabilities” on the balance sheet.
(c)
Less than $1 million.
(d)
Accretion expense was recorded as an increase to regulatory assets at Ameren Missouri and Ameren Illinois.
(e)
Ameren Missouri changed its fair value estimates for asbestos removal in 2012 and 2013, and for certain CCR storage facilities in 2013.                    
See Note 16 – Divestiture Transactions and Discontinued Operations for additional information on the AROs related to the abandoned Meredosia and Hutsonville energy centers, which are presented as discontinued operations and therefore not included in the table above.