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Related Party Transactions (Tables)
 12 Months Ended
Dec. 31, 2018
Related Party Transactions [Abstract]  
Schedule of Related Party Transactions
The following table presents the specified performance period, price, and amount of megawatthours included in the agreements:
IPA Procurement Event
Performance Period
MWh
 
Average Price per MWh
May 2014
January 2015 – February 2017
168,400
$
51
April 2015
June 2015 – June 2017
667,000
 
36
September 2015
November 2015 – May 2018
339,000
 
38
April 2016
June 2017 – September 2018
375,200
 
35
September 2016
May 2017 – September 2018
82,800
 
34
April 2017
March 2019 – May 2020
85,600
 
34
April 2018
June 2019 – September 2020
110,000
 
32
The following table presents the impact on Ameren Missouri and Ameren Illinois of related-party transactions for the years ended December 31, 2018, 2017, and 2016. It is based primarily on the agreements discussed above and the money pool arrangements discussed in Note 4 – Short-term Debt and Liquidity.
Agreement
Income Statement Line Item
 
 
 
Ameren
Missouri
 
Ameren
Illinois
Ameren Missouri power supply agreements
Operating Revenues
 
2018
$
11

$
(a)

with Ameren Illinois
 
 
2017
 
23

 
(a)

 
 
 
2016
 
28

 
(a)

Ameren Missouri and Ameren Illinois
Operating Revenues
 
2018
 
22

 
3

rent and facility services
 
 
2017
 
26

 
4

 
 
 
2016
 
25

 
5

Ameren Missouri and Ameren Illinois miscellaneous
Operating Revenues
 
2018
 
1

 
1

support services and services provided to ATXI
 
 
2017
 
(b)

 
1

 
 
 
2016
 
1

 
(b)

Total Operating Revenues
 
 
2018
$
34

$
4

 
 
 
2017
 
49

 
5

 
 
 
2016
 
54

 
5

Ameren Illinois power supply
Purchased Power
 
2018
$
(a)

$
11

agreements with Ameren Missouri
 
 
2017
 
(a)

 
23

 
 
 
2016
 
(a)

 
28

Ameren Illinois transmission
Purchased Power
 
2018
 
(a)

 
1

services from ATXI
 
 
2017
 
(a)

 
2

 
 
 
2016
 
(a)

 
2

Total Purchased Power
 
 
2018
$
(a)

$
12

 
 
 
2017
 
(a)

 
25

 
 
 
2016
 
(a)

 
30

Ameren Missouri and Ameren Illinois
Other Operations and
 
2018
$
3

$
6

rent and facility services
Maintenance
 
2017
 
(b)

 
(b)

 
 
 
2016
 
(b)

 
(b)

Ameren Services support services
Other Operations and
 
2018
 
136


126

agreement
Maintenance
 
2017
 
149

 
139

 
 
 
2016
 
129

 
123

Total Other Operations and
 
 
2018
$
139

$
132

Maintenance Expenses
 
 
2017
 
149

 
139

 
 
 
2016
 
129

 
123

Money pool borrowings (advances)
(Interest Charges)
 
2018
$
1

$
(b)

 
Other Income, Net
 
2017
 
1

 
(b)

 
 
 
2016
 
(b)

 
(b)

(a)
Not applicable.
(b)
Amount less than $1 million.
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 December 31, 2018 and 2017:
 
2018
 
 
2017
 
Ameren Missouri
Ameren Illinois
 
 
Ameren Missouri
Ameren Illinois
Income taxes payable to parent(a)
$
16

$
7

 
 
$
11

$
17

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 Capital Contributions
The following table presents cash capital contributions received from Ameren (parent) by Ameren Missouri and Ameren Illinois for the years ended December 31, 2018, 2017, and 2016:
 
2018
 
2017
 
2016
 
Ameren Missouri(a)
$
45

 
$
30

 
$
44

(b) 
Ameren Illinois
160

 
8

 
—

 
(a)
As a result of the tax allocation agreement.
(b)
Included a $38 million accrued capital contribution from 2015.