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Related Party Transactions (Tables)
 3 Months Ended
Mar. 31, 2022
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, 2022, and December 31, 2021:
March 31, 2022December 31, 2021
Ameren MissouriAmeren IllinoisAmeren MissouriAmeren Illinois
Income taxes payable to parent(a)
$— $42 $— $8 
Income taxes receivable from parent(b)
33 — 27 18 
(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, 2022 and 2021:
Three Months
AgreementIncome Statement
Line Item		Ameren
Missouri		Ameren
Illinois
Ameren Missouri power supplyOperating Revenues2022$4 $(a)
agreements with Ameren Illinois
20212 (a)
Ameren Missouri and Ameren IllinoisOperating Revenues2022$6 $(b)
rent and facility services
20217 (b)
Ameren Missouri and Ameren Illinois miscellaneousOperating Revenues2022$(b)$1 
support services and other services provided to ATXI2021(b)(b)
Total Operating Revenues2022$10 $1 
20219 (b)
Ameren Illinois power supplyPurchased Power2022$(a)$4 
agreements with Ameren Missouri
2021(a)2 
Ameren Missouri and Ameren IllinoisPurchased Power2022$(b)$(b)
transmission services from ATXI20211 (b)
Total Purchased Power2022$(b)$4 
20211 2 
Ameren Missouri and Ameren IllinoisOther Operations and Maintenance2022$(b)$1 
rent and facility services
2021(b)1 
Ameren Services support servicesOther Operations and Maintenance2022$38 $35 
agreement
202135 33 
Total Other Operations and2022$38 $36 
Maintenance202135 34 
Money pool borrowings (advances)(Interest Charges)/Other Income, Net2022$(b)$(b)
2021(b)(b)
(a)Not applicable.
(b)Amount less than $1 million.