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Related Party Transactions (Tables)
 9 Months Ended
Sep. 30, 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 and nine months ended September 30, 2018 and 2017:
 
 
 
 
Three Months
 
Nine Months
Agreement
Income Statement
Line Item
 
 
Ameren
Missouri
 
Ameren
Illinois
 
Ameren
Missouri
 
Ameren
Illinois
Ameren Missouri power supply
Operating Revenues
2018
$
5

$
(a)

$
11

$
(a)

agreements with Ameren Illinois
 
2017
 
4

 
(a)

 
21

 
(a)

Ameren Missouri and Ameren Illinois
Operating Revenues
2018
 
6

 
(b)

 
17

 
2

rent and facility services
 
2017
 
7

 
1

 
20

 
3

Ameren Missouri and Ameren Illinois
Operating Revenues
2018
 
(b)

 
(b)

 
(b)

 
(b)

miscellaneous support services
 
2017
 
(b)

 
(b)

 
(b)

 
1

Total Operating Revenues
 
2018
$
11

$
(b)

$
28

$
2

 
 
2017
 
11

 
1

 
41

 
4

Ameren Illinois power supply
Purchased Power
2018
$
(a)

$
5

$
(a)

$
11

agreements with Ameren Missouri
 
2017
 
(a)

 
4

 
(a)

 
21

Ameren Illinois transmission
Purchased Power
2018
 
(a)

 
(b)

 
(a)

 
1

services with ATXI
 
2017
 
(a)

 
(b)

 
(a)

 
1

Total Purchased Power
 
2018
$
(a)

$
5

$
(a)

$
12

 
 
2017
 
(a)

 
4

 
(a)

 
22

Ameren Services support services
Other Operations and Maintenance
2018
$
36

$
33

$
101

$
93

agreement
 
2017
 
34

 
33

 
103

 
99

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

$
(b)

$
(b)

$
(b)

 
 
2017
 
(b)

 
(b)

 
(b)

 
(b)

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