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Related Party Transactions
 6 Months Ended
Jun. 30, 2023
Related Party Transactions [Abstract]  
RELATED PARTY TRANSACTIONS RELATED-PARTY TRANSACTIONS
In the ordinary 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.
Support Services Agreements
Ameren Missouri and Ameren Illinois had long-term receivables included in “Other assets” from Ameren Services of $33 million and $35 million, respectively, as of June 30, 2023, and $41 million and $43 million, respectively, as of December 31, 2022, related to Ameren Services’ allocated portion of Ameren’s pension and postretirement benefit plans.
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 June 30, 2023, and December 31, 2022:
June 30, 2023December 31, 2022
Ameren MissouriAmeren IllinoisAmeren MissouriAmeren Illinois
Income taxes payable to parent(a)
$—$28$—$50
Income taxes receivable from parent(b)
38—39—
(a)Included in “Accounts payable – affiliates” on the balance sheet.
(b)Included in “Accounts receivable – affiliates” on the balance sheet.
Effects of Related-party Transactions on the Statement of Income
The following table presents the impact on Ameren Missouri and Ameren Illinois of related-party transactions for the three and six months ended June 30, 2023 and 2022:
Three MonthsSix Months
AgreementIncome Statement
Line Item		Ameren
Missouri		Ameren
Illinois		Ameren
Missouri		Ameren
Illinois
Ameren Missouri power supplyOperating Revenues2023$(b)$(a)$(b)$(a)
agreements with Ameren Illinois
20221 (a)5 (a)
Ameren Missouri and Ameren IllinoisOperating Revenues2023$8 $(b)$18 $(b)
rent and facility services
20226 (b)12 (b)
Ameren Missouri and Ameren Illinois miscellaneousOperating Revenues2023$(b)$(b)$(b)$(b)
support services2022(b)(b)(b)1 
Total Operating Revenues2023$8 $(b)$18 $(b)
20227 (b)17 1 
Ameren Illinois power supplyPurchased Power2023$(a)$(b)$(a)$(b)
agreements with Ameren Missouri
2022(a)1 (a)5 
Ameren Missouri and Ameren IllinoisPurchased Power2023$1 $(b)$1 $(b)
transmission services from ATXI2022(b)(b)(b)(b)
Total Purchased Power2023$1 $(b)$1 $(b)
2022(b)1 (b)5 
Ameren Missouri and Ameren IllinoisOther Operations and Maintenance2023$(b)$(b)$(b)$2 
rent and facility services
2022(b)(b)(b)1 
Ameren Services support servicesOther Operations and Maintenance2023$35 $33 $70 $68 
agreement
202233 32 71 67 
Total Other Operations and2023$35 $33 $70 $70 
Maintenance202233 32 71 68 
Money pool borrowings (advances)(Interest Charges)/Other Income, Net2023$(b)$(b)$(b)$(b)
2022(b)(b)(b)(b)
(a)Not applicable.
(b)Amount less than $1 million.