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Related Party Transactions
 9 Months Ended
Sep. 30, 2015
Related Party Transactions [Abstract]  
RELATED PARTY TRANSACTIONS
RELATED PARTY TRANSACTIONS
Ameren (parent) and its subsidiaries have engaged in, and may in the future engage in, affiliate transactions in the normal course of business. These transactions primarily consist of power purchases and sales, services received or rendered, and borrowings and lendings.
Transactions between affiliates are reported as intercompany transactions on their respective financial statements but are eliminated in consolidation for Ameren’s financial statements. For a discussion of our material related party agreements, see Note 14 - Related Party Transactions under Part II, Item 8, of the Form 10-K and the money pool arrangements discussed in Note 3 - Short-term Debt and Liquidity of this report.

Electric Power Supply Agreements
In April and September 2015, Ameren Illinois conducted procurement events, administered by the IPA, to purchase energy products through May 31, 2018. Ameren Missouri was among the winning suppliers in these events. As a result, in April 2015, Ameren Missouri and Ameren Illinois entered into energy product agreements by which Ameren Missouri agreed to sell and Ameren Illinois agreed to purchase 667,000 megawatthours at an average price of $36 per megawatthour during the period of June 1, 2015, through June 30, 2017. In September 2015, Ameren Missouri and Ameren Illinois entered into energy product agreements by which Ameren Missouri agreed to sell and Ameren Illinois agreed to purchase 339,000 megawatthours at an average price of $38 per megawatthour during the period of November 1, 2015 through May 31, 2018.
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, 2015 and 2014.
 
 
 
 
 
Three Months
 
Nine Months
Agreement
Income Statement
Line Item
 
 
 
Ameren
Missouri
 
Ameren
Illinois
 
Ameren
Missouri
 
Ameren
Illinois
Ameren Missouri power supply
Operating Revenues
 
2015
$
4

$
(a)

$
9

$
(a)

agreements with Ameren Illinois
 
 
2014
 
2

 
(a)

 
5

 
(a)

Ameren Missouri and Ameren Illinois
Operating Revenues
 
2015
 
6

 
1

 
19

 
3

rent and facility services
 
 
2014
 
6

 
(b)

 
15

 
1

Ameren Missouri and Ameren Illinois
Operating Revenues
 
2015
 
1

 
(b)

 
2

 
(b)

miscellaneous support services
 
 
2014
 
(b)

 
(b)

 
1

 
(b)

Total Operating Revenues
 
 
2015
$
11

$
1

$
30

$
3

 
 
 
2014
 
8

 
(b)

 
21

 
1

Ameren Illinois power supply
Purchased Power
 
2015
$
(a)

$
4

$
(a)

$
9

agreements with Ameren Missouri
 
 
2014
 
(a)

 
2

 
(a)

 
5

Ameren Illinois transmission
Purchased Power
 
2015
 
(a)

 
1

 
(a)

 
2

services with ATXI
 
 
2014
 
(a)

 
1

 
(a)

 
2

Total Purchased Power
 
 
2015
$
(a)

$
5

$
(a)

$
11

 
 
 
2014
 
(a)

 
3

 
(a)

 
7

Ameren Services support services
Other Operations and Maintenance
 
2015
$
30

$
28

$
96

$
87

agreement
 
 
2014
 
25

 
26

 
90

 
80

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.