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Related Party Transactions (Tables)
 6 Months Ended
Jun. 30, 2020
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 June 30, 2020, and December 31, 2019:
June 30, 2020December 31, 2019
Ameren MissouriAmeren IllinoisAmeren MissouriAmeren Illinois
Income taxes payable to parent(a)
$39  $6  $15  $43  
Income taxes receivable from parent(b)
—  11  15  17  
(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 and six months ended June 30, 2020 and 2019:
Three MonthsSix Months
AgreementIncome Statement
Line Item		Ameren
Missouri		Ameren
Illinois		Ameren
Missouri		Ameren
Illinois
Ameren Missouri power supplyOperating Revenues2020$3  $(a)$6  $(a)
agreements with Ameren Illinois
20192  (a)2  (a)
Ameren Missouri and Ameren IllinoisOperating Revenues2020$6  $(b)$13  $1  
rent and facility services
20196  (b)13  1  
Ameren Missouri and Ameren IllinoisOperating Revenues2020$1  $(b)$1  $(b)
miscellaneous support services
2019(b)1  (b)1  
Total Operating Revenues2020$10  $(b)$20  $1  
20198  1  15  2  
Ameren Illinois power supplyPurchased Power2020$(a)$3  $(a)$6  
agreements with Ameren Missouri
2019(a)2  (a)2  
Ameren Illinois transmissionPurchased Power2020$(a)$1  $(a)$1  
services with ATXI
2019(a)(b)(a)(b)
Total Purchased Power2020$(a)$4  $(a)$7  
2019(a)2  (a)2  
Ameren Missouri and Ameren IllinoisOther Operations and Maintenance2020$(b)$1  $(b)$2  
rent and facility services
20191  2  1  3  
Ameren Services support servicesOther Operations and Maintenance2020$32  $31  $67  $64  
agreement
201932  31  64  61  
Total Other Operations and2020$32  $32  $67  $66  
Maintenance201933  33  65  64  
Money pool borrowings (advances)(Interest Charges)/Other Income, Net2020$(b)$(b)$(b)$(b)
2019(b)(b)(b)(b)
(a)Not applicable.
(b)Amount less than $1 million.