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Related Party Transactions (Tables)
 6 Months Ended
Jun. 30, 2019
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, 2019 and 2018:
 
 
 
 
Three Months
 
Six Months
Agreement
Income Statement
Line Item
 
 
Ameren
Missouri
 
Ameren
Illinois
 
Ameren
Missouri
 
Ameren
Illinois
Ameren Missouri power supply
Operating Revenues
2019
$
2

$
(a)

$
2

$
(a)

agreements with Ameren Illinois
 
2018
 
3

 
(a)

 
6

 
(a)

Ameren Missouri and Ameren Illinois
Operating Revenues
2019
$
6

$
(b)

$
13

$
1

rent and facility services
 
2018
 
6

 
1

 
11

 
2

Ameren Missouri and Ameren Illinois
Operating Revenues
2019
$
(b)

$
1

$
(b)

$
1

miscellaneous support services
 
2018
 
(b)

 
(b)

 
(b)

 
(b)

Total Operating Revenues
 
2019
$
8

$
1

$
15

$
2

 
 
2018
 
9

 
1

 
17

 
2

Ameren Illinois power supply
Purchased Power
2019
$
(a)

$
2

$
(a)

$
2

agreements with Ameren Missouri
 
2018
 
(a)

 
3

 
(a)

 
6

Ameren Illinois transmission
Purchased Power
2019
$
(a)

$
(b)

$
(a)

$
(b)

services with ATXI
 
2018
 
(a)

 
1

 
(a)

 
1

Total Purchased Power
 
2019
$
(a)

$
2

$
(a)

$
2

 
 
2018
 
(a)

 
4

 
(a)

 
7

Ameren Missouri and Ameren Illinois
Other Operations and Maintenance
2019
$
1

$
2

$
1

$
3

rent and facility services
 
2018
 
(b)

 
1

 
1

 
3

Ameren Services support services
Other Operations and Maintenance
2019
$
32

$
31

$
64

$
61

agreement
 
2018
 
32

 
30

 
65

 
60

Total Other Operations and
 
2019
$
33

$
33

$
65

$
64

Maintenance
 
2018
 
32

 
31

 
66

 
63

Money pool borrowings (advances)
Interest Charges/Other Income, Net
2019
$
(b)

$
(b)

$
(b)

$
(b)

 
 
2018
 
(b)

 
(b)

 
(b)

 
(b)

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