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Related Party Transactions (Tables)
 9 Months Ended
Sep. 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 nine months ended September 30, 2016 and 2015:
 
 
 
 
Three Months
 
Nine Months
Agreement
Income Statement
Line Item
 
 
Ameren
Missouri
 
Ameren
Illinois
 
Ameren
Missouri
 
Ameren
Illinois
Ameren Missouri power supply
Operating Revenues
2016
$
9

$
(a)

$
21

$
(a)

agreements with Ameren Illinois
 
2015
 
4

 
(a)

 
9

 
(a)

Ameren Missouri and Ameren Illinois
Operating Revenues
2016
 
5

 
1

 
18

 
3

rent and facility services
 
2015
 
6

 
1

 
19

 
3

Ameren Missouri and Ameren Illinois
Operating Revenues
2016
 
1

 
(b)

 
1

 
(b)

miscellaneous support services
 
2015
 
1

 
(b)

 
2

 
(b)

Total Operating Revenues
 
2016
$
15

$
1

$
40

$
3

 
 
2015
 
11

 
1

 
30

 
3

Ameren Illinois power supply
Purchased Power
2016
$
(a)

$
9

$
(a)

$
21

agreements with Ameren Missouri
 
2015
 
(a)

 
4

 
(a)

 
9

Ameren Illinois transmission
Purchased Power
2016
 
(a)

 
1

 
(a)

 
2

services with ATXI
 
2015
 
(a)

 
1

 
(a)

 
2

Total Purchased Power
 
2016
$
(a)

$
10

$
(a)

$
23

 
 
2015
 
(a)

 
5

 
(a)

 
11

Ameren Services support services
Other Operations and Maintenance
2016
$
30

$
29

$
96

$
90

agreement
 
2015
 
30

 
28

 
96

 
87

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.