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Related Party Transactions (Tables)
 3 Months Ended
Mar. 31, 2024
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, 2024, and December 31, 2023:
March 31, 2024December 31, 2023
Ameren MissouriAmeren IllinoisAmeren MissouriAmeren Illinois
Income taxes payable to parent(a)
$—$43$—$2
Income taxes receivable from parent(b)
32—5622
(a)Included in “Accounts payable – affiliates” on the balance sheet.
(b)Included in “Accounts receivable – affiliates” on the balance sheet.
Schedule of Related Party Transactions
The following table presents the impact on Ameren Missouri and Ameren Illinois of related-party transactions for the three months ended March 31, 2024 and 2023:
Three Months
AgreementIncome Statement
Line Item		Ameren
Missouri		Ameren
Illinois
Ameren Missouri power supplyOperating Revenues2024$(b)$(a)
agreements with Ameren Illinois
2023(b)(a)
Ameren Missouri and Ameren IllinoisOperating Revenues2024$7 $(b)
rent and facility services
202310 (b)
Ameren Missouri and Ameren Illinois miscellaneousOperating Revenues2024$(b)$1 
support services2023(b)(b)
Total Operating Revenues2024$7 $1 
202310 (b)
Ameren Illinois power supplyPurchased Power2024$(a)$(b)
agreements with Ameren Missouri
2023(a)(b)
Ameren Missouri and Ameren IllinoisPurchased Power2024$2 $(b)
transmission services from ATXI2023(b)(b)
Total Purchased Power2024$2 $(b)
2023(b)(b)
Ameren Missouri and Ameren IllinoisOther Operations and Maintenance2024$(b)$(b)
rent and facility services
2023(b)2 
Ameren Services support servicesOther Operations and Maintenance2024$38 $37 
agreement
202335 35 
Total Other Operations and2024$38 $37 
Maintenance202335 37 
Money pool interest(Interest Charges)/Other Income, Net2024$(3)$(2)
2023(b)(b)
(a)Not applicable.
(b)Amount less than $1 million.