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Related Party Transactions (Tables)
 3 Months Ended
Mar. 31, 2018
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 months ended March 31, 2018 and 2017:
 
 
 
 
Three Months
Agreement
Income Statement
Line Item
 
 
Ameren
Missouri
 
Ameren
Illinois
Ameren Missouri power supply
Operating Revenues
2018
$
3

$
(a)

agreements with Ameren Illinois
 
2017
 
11

 
(a)

Ameren Missouri and Ameren Illinois
Operating Revenues
2018
 
5

 
1

rent and facility services
 
2017
 
7

 
1

Ameren Missouri and Ameren Illinois
Operating Revenues
2018
 
(b)

 
(b)

miscellaneous support services
 
2017
 
(b)

 
(b)

Total Operating Revenues
 
2018
$
8

$
1

 
 
2017
 
18

 
1

Ameren Illinois power supply
Purchased Power
2018
$
(a)

$
3

agreements with Ameren Missouri
 
2017
 
(a)

 
11

Ameren Illinois transmission
Purchased Power
2018
 
(a)

 
(b)

services with ATXI
 
2017
 
(a)

 
(b)

Total Purchased Power
 
2018
$
(a)

$
3

 
 
2017
 
(a)

 
11

Ameren Services support services
Other Operations and Maintenance
2018
$
33

$
30

agreement
 
2017
 
35

 
32

Money pool borrowings (advances)
Interest Charges/ Other Income, Net
2018
$
(b)

$
(b)

 
 
2017
 
(b)

 
(b)

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