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Related Party Transactions (Tables)
 9 Months Ended
Sep. 30, 2019
Related Party Transactions [Abstract]  
Schedule of affiliate receivables and payables The following table presents the affiliate balances related to income taxes for Ameren Missouri and Ameren Illinois as of September 30, 2019, and December 31, 2018:
 
September 30, 2019
 
 
December 31, 2018
 
Ameren Missouri
Ameren Illinois
 
 
Ameren Missouri
Ameren Illinois
Income taxes payable to parent(a)
$
58

$
24

 
 
$
16

$
7

Income taxes receivable from parent(b)
—

—

 
 
—

6

(a)
Included in “Accounts payable – affiliates” on the balance sheet.
(b)
Included in “Accounts receivable – affiliates” on the balance sheet.
Schedule of Related Party Transactions
The following table presents the effect on Ameren Missouri and Ameren Illinois of related-party transactions for the three and nine months ended September 30, 2019 and 2018:
 
 
 
 
Three Months
 
Nine Months
Agreement
Income Statement
Line Item
 
 
Ameren
Missouri

Ameren
Illinois

Ameren
Missouri

Ameren
Illinois
Ameren Missouri power supply
Operating Revenues
2019
$
1

$
(a)

$
3

$
(a)

agreements with Ameren Illinois
 
2018
 
5

 
(a)

 
11

 
(a)

Ameren Missouri and Ameren Illinois
Operating Revenues
2019
$
7

$
1

$
20

$
2

rent and facility services
 
2018
 
6

 
(b)

 
17

 
2

Ameren Missouri and Ameren Illinois
Operating Revenues
2019
$
1

$
(b)

$
1

$
1

miscellaneous support services
 
2018
 
(b)

 
(b)

 
(b)

 
(b)

 
 
 
 
Three Months
 
Nine Months
Agreement
Income Statement
Line Item
 
 
Ameren
Missouri

Ameren
Illinois

Ameren
Missouri

Ameren
Illinois
Ameren Missouri software licensing
Operating Revenues
2019
$
(a)

$
19

$
(a)

$
19

with Ameren Illinois
 
2018
 
(a)

 
(a)

 
(a)

 
(a)

Total Operating Revenues
 
2019
$
9

$
20

$
24

$
22

 
 
2018
 
11

 
(b)

 
28

 
2

Ameren Illinois power supply
Purchased Power
2019
$
(a)

$
1

$
(a)

$
3

agreements with Ameren Missouri
 
2018
 
(a)

 
5

 
(a)

 
11

Ameren Illinois transmission
Purchased Power
2019
$
(a)

$
1

$
(a)

$
1

services with ATXI
 
2018
 
(a)

 
(b)

 
(a)

 
1

Total Purchased Power
 
2019
$
(a)

$
2

$
(a)

$
4

 
 
2018
 
(a)

 
5

 
(a)

 
12

Ameren Missouri and Ameren Illinois
Other Operations and Maintenance
2019
$
(b)

$
1

$
1

$
4

rent and facility services
 
2018
 
1

 
1

 
2

 
4

Ameren Services support services
Other Operations and Maintenance
2019
$
34

$
30

$
98

$
91

agreement
 
2018
 
36

 
33

 
101

 
93

Total Other Operations and
 
2019
$
34

$
31

$
99

$
95

Maintenance
 
2018
 
37

 
34

 
103

 
97

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.