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Related Party Transactions
 9 Months Ended
Sep. 30, 2019
Related Party Transactions [Abstract]  
RELATED PARTY TRANSACTIONS RELATED-PARTY TRANSACTIONS
In the normal course of business, Ameren Missouri and Ameren Illinois have engaged in, and may in the future engage in, affiliate transactions. These transactions primarily consist of natural gas and power purchases and sales, services received or rendered, and borrowings and lendings. Transactions between Ameren’s subsidiaries are reported as affiliate transactions on their individual financial statements, but those transactions are eliminated in consolidation for Ameren’s consolidated financial statements. For a discussion of material related-party agreements and money pool arrangements, see Note 13 – Related-party Transactions and Note 4 – Short-term Debt and Liquidity under Part II, Item 8, of the Form 10-K.
Electric Power Supply Agreement
In April and September 2019, Ameren Illinois conducted procurement events, administered by the IPA, to purchase energy products. Ameren Missouri was among the winning suppliers in these events. As a result, in April 2019, Ameren Missouri and Ameren Illinois entered into an energy product agreement by which Ameren Missouri agreed to sell, and Ameren Illinois agreed to purchase, 288,000 megawatthours at an average price of $35 per megawatthour during the period of January 2020 through December 2021. In September 2019, Ameren Missouri and Ameren Illinois entered into an energy product agreement by which Ameren Missouri agreed to sell, and Ameren Illinois agreed to purchase, 170,800 megawatthours at an average price of $29 per megawatthour during the period of April 2020 through November 2021.
Software Licensing Agreement
In September 2019, Ameren Missouri purchased a license for advanced metering infrastructure software from Ameren Illinois. The amount of the $24 million cost-based transaction price over the $5 million remaining carrying value of the software was recorded as revenue by Ameren Illinois, with $14 million of revenue recorded at Ameren Illinois Electric Distribution and $5 million recorded at Ameren Illinois Natural Gas. The revenue recorded at Ameren Illinois Electric Distribution was reflected in formula ratemaking, which resulted in no impact to net income. Per authoritative accounting guidance for sales to rate-regulated entities, the revenue recognized by Ameren Illinois was not eliminated upon consolidation by Ameren. Ameren Missouri's $24 million software investment is included in "Property, Plant, and Equipment, Net.” Ameren Missouri and Ameren Illinois included $24 million in "Accounts payable – affiliates" and "Accounts receivable – affiliates," respectively, as of September 30, 2019, as a result of this transaction.
Tax Allocation Agreement
See Note 1 – Summary of Significant Accounting Policies under Part II, Item 8, of the Form 10-K for a discussion of the tax allocation agreement. 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.
Effects of Related-party Transactions on the Statement of Income
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.