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Supplemental Information (Tables)
 3 Months Ended
Mar. 31, 2025
Supplemental Information [Abstract]  
Schedule of Cash and Cash Equivalents Including Restricted Cash
The following table provides a reconciliation of cash, cash equivalents, and restricted cash reported within the balance sheets and the statements of cash flows at March 31, 2025, and December 31, 2024:
March 31, 2025December 31, 2024
AmerenAmeren
Missouri		Ameren
Illinois		AmerenAmeren
Missouri		Ameren
Illinois
“Cash and cash equivalents”$23 $7 $4 $7 $— $— 
Restricted cash included in “Other current assets”40 32 5 15 7 6 
Restricted cash included in “Other assets”307 — 307 296 — 296 
Restricted cash included in “Nuclear decommissioning trust fund”6 6 — 10 10 — 
Total cash, cash equivalents, and restricted cash$376 $45 $316 $328 $17 $302 
Schedule of Accounts, Notes, Loans and Financing Receivable
The following table provides a reconciliation of the beginning and ending amount of the allowance for doubtful accounts for the three months ended March 31, 2025 and 2024:
Three Months
20252024
Ameren:
Beginning of period$30 $30 
Bad debt expense16 10 
Charged to other accounts(a)
1 3 
Net write-offs(6)(6)
End of period$41 $37 
Ameren Missouri:
Beginning of period$12 $12 
Bad debt expense2 1 
Net write-offs(2)(2)
End of period$12 $11 
Ameren Illinois:(b)
Beginning of period$18 $18 
Bad debt expense14 9 
Charged to other accounts(a)
1 3 
Net write-offs(4)(4)
End of period$29 $26 
(a)Amounts associated with the allowance for doubtful accounts related to receivables purchased by Ameren Illinois from alternative retail electric suppliers, as required by the Illinois Public Utilities Act.
(b)Ameren Illinois has rate-adjustment mechanisms that allow it to recover the difference between its actual net bad debt write-offs under GAAP, including those associated with receivables purchased from alternative retail electric suppliers, and the amount of net bad debt write-offs included in its base rates. The table above does not include the impact related to the riders.
Schedule of Cash Flow, Supplemental Disclosures
The following table provides noncash financing and investing activity excluded from the statements of cash flows for the three months ended March 31, 2025 and 2024:
March 31, 2025March 31, 2024
AmerenAmeren
Missouri		Ameren
Illinois		AmerenAmeren
Missouri		Ameren
Illinois
Investing:
Accrued capital expenditures, including nuclear fuel expenditures$381 $214 $159 $310 $169 $122 
Net realized and unrealized gain/(loss) – nuclear decommissioning trust fund(40)(40)— 74 74 — 
Financing:
Issuance of common stock for stock-based compensation$25 $— $— $16 $— $— 
Issuance of common stock under the DRPlus9 — — 7 — — 
Asset Retirement Obligation Disclosure
The following table provides a reconciliation of the beginning and ending carrying amount of AROs for the three months ended March 31, 2025:
Ameren
Missouri		Ameren
Illinois		Ameren
Balance at December 31, 2024
$823 
(a) 
$4 
(b) 
$827 
(a) 
Liabilities settled(1)— (1)
Accretion9 
(c) 
— 

9 
(c) 
Balance at March 31, 2025
$831 
(a) 
$4 
(b) 
$835 
(a) 
(a)Balance included $5 million in “Other current liabilities” on the balance sheet as of both March 31, 2025, and December 31, 2024.
(b)Included in “Other deferred credits and liabilities” on the balance sheet.
(c)Accretion expense attributable to Ameren Missouri was recorded as a decrease to regulatory liabilities.
Schedule of excise taxes The following table presents the excise taxes recorded on a gross basis in “Operating Revenues – Electric,” “Operating Revenues – Natural gas” and “Operating Expenses – Taxes other than income taxes” on the statements of income for the three months ended March 31, 2025 and 2024:
Three Months
20252024
Ameren Missouri$38 $35 
Ameren Illinois43 37 
Ameren$81 $72 
Schedule of Earnings Per Share, Basic and Diluted
The following table reconciles the basic weighted-average number of common shares outstanding to the diluted weighted-average number of common shares outstanding for the three months ended March 31, 2025 and 2024:
Three Months
20252024
Weighted-average Common Shares Outstanding – Basic270.0 266.4 
Assumed settlement of performance share units and restricted stock units1.0 0.4 
Dilutive effect of forward sale agreements0.4 — 
Weighted-average Common Shares Outstanding – Diluted(a)
271.4 266.8 
(a)There was an immaterial number of anti-dilutive performance share units excluded from the earnings per diluted share calculations for the three months ended March 31, 2025 and 2024. There were no anti-dilutive shares related to the outstanding forward sale agreements as of March 31, 2025 excluded from earnings per diluted share calculations for three months ended March 31, 2025. The outstanding forward sale agreements as of March 31, 2024 were anti-dilutive for the three months ended March 31, 2024, and were excluded from the earnings per diluted share calculation as calculated using the treasury stock method. For additional information about the outstanding forward sale agreements, see Note 4 – Long-term Debt and Equity Financings.