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Related Party Transactions (Tables)
 6 Months Ended
Jun. 30, 2015
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, 2015 and 2014.
 
 
 
 
 
Three Months
 
Six Months
Agreement
Income Statement
Line Item
 
 
 
Ameren
Missouri
 
Ameren
Illinois
 
Ameren
Missouri
 
Ameren
Illinois
Ameren Missouri power supply
Operating Revenues
 
2015
$
4

$
(a)

$
5

$
(a)

agreements with Ameren Illinois
 
 
2014
 
3

 
(a)

 
3

 
(a)

Ameren Missouri and Ameren Illinois
Operating Revenues
 
2015
 
7

 
1

 
13

 
2

rent and facility services
 
 
2014
 
4

 
1

 
9

 
1

Ameren Missouri and Ameren Illinois
Operating Revenues
 
2015
 
1

 
(b)

 
1

 
(b)

miscellaneous support services
 
 
2014
 
1

 
(b)

 
1

 
(b)

Total Operating Revenues
 
 
2015
$
12

$
1

$
19

$
2

 
 
 
2014
 
8

 
1

 
13

 
1

Ameren Illinois power supply
Purchased Power
 
2015
$
(a)

$
4

$
(a)

$
5

agreements with Ameren Missouri
 
 
2014
 
(a)

 
3

 
(a)

 
3

Ameren Illinois transmission
Purchased Power
 
2015
 
(a)

 
(b)

 
(a)

 
1

services with ATXI
 
 
2014
 
(a)

 
(b)

 
(a)

 
1

Total Purchased Power
 
 
2015
$
(a)

$
4

$
(a)

$
6

 
 
 
2014
 
(a)

 
3

 
(a)

 
4

Ameren Services support services
Other Operations and Maintenance
 
2015
$
32

$
30

$
66

$
59

agreement
 
 
2014
 
32

 
27

 
65

 
54

Money pool borrowings (advances)
Interest Charges/ Miscellaneous Income
 
2015
$
(b)

$
(b)

$
(b)

$
(b)

 
 
 
2014
 
(b)

 
(b)

 
(b)

 
(b)

(a)
Not applicable.
(b)
Amount less than $1 million.