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Related Party Transactions (Tables)
 6 Months Ended
Jun. 30, 2017
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, 2017 and 2016:
 
 
 
 
Three Months
 
Six Months
Agreement
Income Statement
Line Item
 
 
Ameren
Missouri
 
Ameren
Illinois
 
Ameren
Missouri
 
Ameren
Illinois
Ameren Missouri power supply
Operating Revenues
2017
$
6

$
(a)

$
17

$
(a)

agreements with Ameren Illinois
 
2016
 
3

 
(a)

 
12

 
(a)

Ameren Missouri and Ameren Illinois
Operating Revenues
2017
 
6

 
1

 
13

 
2

rent and facility services
 
2016
 
7

 
1

 
13

 
2

Ameren Missouri and Ameren Illinois
Operating Revenues
2017
 
(b)

 
1

 
(b)

 
1

miscellaneous support services
 
2016
 
(b)

 
(b)

 
(b)

 
(b)

Total Operating Revenues
 
2017
$
12

$
2

$
30

$
3

 
 
2016
 
10

 
1

 
25

 
2

Ameren Illinois power supply
Purchased Power
2017
$
(a)

$
6

$
(a)

$
17

agreements with Ameren Missouri
 
2016
 
(a)

 
3

 
(a)

 
12

Ameren Illinois transmission
Purchased Power
2017
 
(a)

 
1

 
(a)

 
1

services with ATXI
 
2016
 
(a)

 
1

 
(a)

 
1

Total Purchased Power
 
2017
$
(a)

$
7

$
(a)

$
18

 
 
2016
 
(a)

 
4

 
(a)

 
13

Ameren Services support services
Other Operations and Maintenance
2017
$
34

$
34

$
69

$
66

agreement
 
2016
 
32

 
30

 
66

 
61

Money pool borrowings (advances)
Interest Charges/ Miscellaneous Income
2017
$
(b)

$
(b)

$
(b)

$
(b)

 
 
2016
 
(b)

 
(b)

 
(b)

 
(b)

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