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Related Party Transactions (Tables)
 6 Months Ended
Jun. 30, 2013
Related Party Transactions [Abstract]  
Schedule of Related Party Transactions
The following table presents the impact on Ameren Missouri and Ameren Illinois of related party transactions for the three and six months ended June 30, 2013, and 2012. It is based primarily on the agreements discussed above and in Note 14 - Related Party Transactions under Part II, Item 8, of the Form 10-K, and the money pool arrangements discussed in Note 4 - Short-term Debt and Liquidity of this report.
  
  
 
  
 
Three Months
 
Six Months
Agreement
Income Statement
Line Item
 
  
 
Ameren
Missouri
 
Ameren
Illinois
 
Ameren
Missouri
 
Ameren
Illinois
Ameren Missouri power supply
Operating Revenues
 
2013
$
(b)

$
(a)
$
1
$
(a)

agreements with Ameren Illinois
 
 
2012
 
(b)

 
(a)

 
(b)
 
(a)

Ameren Missouri and Ameren Illinois
Operating Revenues
 
2013
 
5

 
(b)

 
11
 
(b)

rent and facility services
 
 
2012
 
5

 
(b)

 
9
 
(b)

Ameren Missouri and Genco gas
Operating Revenues
 
2013
 
(b)

 
(a)

 
(b)
 
(a)

transportation agreement
 
 
2012
 
(b)

 
(a)

 
(b)
 
(a)

Transmission services agreement
Operating Revenues
 
2013
 
(a)

 
7

 
(a)
 
13

with Marketing Company
 
 
2012
 
(a)

 
3

 
(a)
 
5

Total Operating Revenues
 
 
2013
$
5

$
7

$
12
$
13

 
 
 
2012
 
5

 
3

 
9
 
5

Ameren Illinois power supply
Purchased Power
 
2013
$
(a)

$
22

$
(a)
$
48

agreements with Marketing Company
 
 
2012
 
(a)

 
72

 
(a)
 
160

Ameren Illinois power supply
Purchased Power
 
2013
 
(a)

 
(b)

 
(a)
 
1

agreements with Ameren Missouri
 
 
2012
 
(a)

 
(b)

 
(a)
 
(b)

Total Purchased Power
 
 
2013
$
(a)

$
22

$
(a)
$
49

 
 
 
2012
 
(a)

 
72

 
(a)
 
160

Ameren Services support services
Other Operations and Maintenance
 
2013
$
28

$
24

$
60
$
48

agreement

 
2012
 
27

 
22

 
55
 
45

Insurance premiums(c)
Other Operations and Maintenance
 
2013
 
(b)

 
(a)

 
(b)
 
(a)

 

 
2012
 
(b)

 
(a)

 
(b)
 
(a)

Total Other Operations and
 
 
2013
$
28

$
24

$
60
$
48

Maintenance Expenses
 
 
2012
 
27

 
22

 
55
 
45

Money pool borrowings (advances)
Interest Charges
 
2013
$
__

$
(b)

$
(b)
$
(b)

 
 
 
2012
 
__

 
(b)

 
__
 
(b)

(a)
Not applicable.
(b)
Amount less than $1 million.
(c)
Represents insurance premiums paid to Missouri Energy Risk Assurance Company, an affiliate, for replacement power