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Related Party Transactions (Tables)
 3 Months Ended
Mar. 31, 2021
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, 2021, and December 31, 2020:
March 31, 2021December 31, 2020
Ameren MissouriAmeren IllinoisAmeren MissouriAmeren Illinois
Income taxes payable to parent(a)
$— $6 $— $6 
Income taxes receivable from parent(b)
14 18 9 15 
(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 effect on Ameren Missouri and Ameren Illinois of related-party transactions for the three months ended March 31, 2021 and 2020:
Three Months
AgreementIncome Statement
Line Item		Ameren
Missouri		Ameren
Illinois
Ameren Missouri power supplyOperating Revenues2021$2 $(a)
agreements with Ameren Illinois
20203 (a)
Ameren Missouri and Ameren IllinoisOperating Revenues2021$7 $(b)
rent and facility services
20207 1 
Ameren Missouri and Ameren Illinois miscellaneousOperating Revenues2021$(b)$(b)
support services and services provided to ATXI2020(b)(b)
Total Operating Revenues2021$9 $(b)
202010 1 
Ameren Illinois power supplyPurchased Power2021$(a)$2 
agreements with Ameren Missouri
2020(a)3 
Ameren Missouri and Ameren IllinoisPurchased Power2021$1 $(b)
transmission services from ATXI2020(a)(b)
Total Purchased Power2021$1 $2 
2020(a)3 
Ameren Missouri and Ameren IllinoisOther Operations and Maintenance2021$(b)$1 
rent and facility services
2020(b)1 
Ameren Services support servicesOther Operations and Maintenance2021$35 $33 
agreement
202035 33 
Total Other Operations and2021$35 $34 
Maintenance202035 34 
Money pool borrowings (advances)(Interest Charges)/Other Income, Net2021$(b)$(b)
2020(b)(b)
(a)Not applicable.
(b)Amount less than $1 million.