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Related Party Transactions (Tables)
 3 Months Ended
Mar. 31, 2023
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 March 31, 2023, and December 31, 2022:
March 31, 2023December 31, 2022
Ameren MissouriAmeren IllinoisAmeren MissouriAmeren Illinois
Income taxes payable to parent(a)
$— $80 $— $50 
Income taxes receivable from parent(b)
54 — 39 — 
(a)Included in “Accounts payable – affiliates” on the balance sheet.
(b)Included in “Accounts receivable – affiliates” on the balance sheet.
Schedule of Related Party Transactions
The following table presents the impact on Ameren Missouri and Ameren Illinois of related-party transactions for the three months ended March 31, 2023 and 2022:
Three Months
AgreementIncome Statement
Line Item		Ameren
Missouri		Ameren
Illinois
Ameren Missouri power supplyOperating Revenues2023$(b)$(a)
agreements with Ameren Illinois
20224 (a)
Ameren Missouri and Ameren IllinoisOperating Revenues2023$10 $(b)
rent and facility services
20226 (b)
Ameren Missouri and Ameren Illinois miscellaneousOperating Revenues2023$(b)$(b)
support services2022(b)1 
Total Operating Revenues2023$10 $(b)
202210 1 
Ameren Illinois power supplyPurchased Power2023$(a)$(b)
agreements with Ameren Missouri
2022(a)4 
Ameren Missouri and Ameren IllinoisPurchased Power2023$(b)$(b)
transmission services from ATXI2022(b)(b)
Total Purchased Power2023$(b)$(b)
2022(b)4 
Ameren Missouri and Ameren IllinoisOther Operations and Maintenance2023$(b)$2 
rent and facility services
2022(b)1 
Ameren Services support servicesOther Operations and Maintenance2023$35 $35 
agreement
202238 35 
Total Other Operations and2023$35 $37 
Maintenance202238 36 
Money pool borrowings (advances)(Interest Charges)/Other Income, Net2023$(b)$(b)
2022(b)(b)
(a)Not applicable.
(b)Amount less than $1 million.