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Related Party Transactions (Tables)
 6 Months Ended
Jun. 30, 2016
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, 2016 and 2015:
 
 
 
 
 
Three Months
 
Six Months
Agreement
Income Statement
Line Item
 
 
 
Ameren
Missouri
 
Ameren
Illinois
 
Ameren
Missouri
 
Ameren
Illinois
Ameren Missouri power supply
Operating Revenues
 
2016
$
3

$
(a)

$
12

$
(a)

agreements with Ameren Illinois
 
 
2015
 
4

 
(a)

 
5

 
(a)

Ameren Missouri and Ameren Illinois
Operating Revenues
 
2016
 
7

 
1

 
13

 
2

rent and facility services
 
 
2015
 
7

 
1

 
13

 
2

Ameren Missouri and Ameren Illinois
Operating Revenues
 
2016
 
(b)

 
(b)

 
(b)

 
(b)

miscellaneous support services
 
 
2015
 
1

 
(b)

 
1

 
(b)

Total Operating Revenues
 
 
2016
$
10

$
1

$
25

$
2

 
 
 
2015
 
12

 
1

 
19

 
2

Ameren Illinois power supply
Purchased Power
 
2016
$
(a)

$
3

$
(a)

$
12

agreements with Ameren Missouri
 
 
2015
 
(a)

 
4

 
(a)

 
5

Ameren Illinois transmission
Purchased Power
 
2016
 
(a)

 
1

 
(a)

 
1

services with ATXI
 
 
2015
 
(a)

 
(b)

 
(a)

 
1

Total Purchased Power
 
 
2016
$
(a)

$
4

$
(a)

$
13

 
 
 
2015
 
(a)

 
4

 
(a)

 
6

Ameren Services support services
Other Operations and Maintenance
 
2016
$
32

$
30

$
66

$
61

agreement
 
 
2015
 
32

 
30

 
66

 
59

Money pool borrowings (advances)
Interest Charges/ Miscellaneous Income
 
2016
$
(b)

$
(b)

$
(b)

$
(b)

 
 
 
2015
 
(b)

 
(b)

 
(b)

 
(b)

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