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Supplemental Information (Tables) | 6 Months Ended
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Jun. 30, 2024
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 June 30, 2024, and December 31, 2023:
| June 30, 2024 |  |  | December 31, 2023
Ameren |  | Ameren Missouri |  | Ameren Illinois |  |  | Ameren |  | Ameren Missouri |  | Ameren Illinois
“Cash and cash equivalents” | $ | 19 |  |  | $ | — |  |  | $ | 6 |  |  |  | $ | 25 |  |  | $ | — |  |  | $ | — |
Restricted cash included in “Other current assets” | 18 |  |  | 7 |  |  | 7 |  |  |  | 13 |  |  | 5 |  |  | 5 |
Restricted cash included in “Other assets” | 260 |  |  | — |  |  | 260 |  |  |  | 229 |  |  | — |  |  | 229 |
Restricted cash included in “Nuclear decommissioning trust fund” | 4 |  |  | 4 |  |  | — |  |  |  | 5 |  |  | 5 |  |  | — |
Total cash, cash equivalents, and restricted cash | $ | 301 |  |  | $ | 11 |  |  | $ | 273 |  |  |  | $ | 272 |  |  | $ | 10 |  |  | $ | 234 |
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 and six months ended June 30, 2024 and 2023:
| Three Months |  | Six Months
| 2024 |  | 2023 |  |  | 2024 |  | 2023 |
Ameren: |  |  |  |  |  |  |  |  |
Beginning of period | $ | 37 |  |  | $ | 34 |  |  |  | $ | 30 |  |  | $ | 31 |  |
Bad debt expense | 6 |  |  | 13 |  |  |  | 16 |  |  | 23 |  |
Charged to other accounts(a) | 1 |  |  | 1 |  |  |  | 4 |  |  | 1 |  |
Net write-offs | (7) |  |  | (9) |  |  |  | (13) |  |  | (16) |  |
End of period | $ | 37 |  |  | $ | 39 |  |  |  | $ | 37 |  |  | $ | 39 |  |
Ameren Missouri: |  |  |  |  |  |  |  |  |
Beginning of period | $ | 11 |  |  | $ | 12 |  |  |  | $ | 12 |  |  | $ | 13 |  |
Bad debt expense | 4 |  |  | 2 |  |  |  | 5 |  |  | 4 |  |
Net write-offs | (3) |  |  | (2) |  |  |  | (5) |  |  | (5) |  |
End of period | $ | 12 |  |  | $ | 12 |  |  |  | $ | 12 |  |  | $ | 12 |  |
Ameren Illinois:(b) |  |  |  |  |  |  |  |  |
Beginning of period | $ | 26 |  |  | $ | 22 |  |  |  | $ | 18 |  |  | $ | 18 |  |
Bad debt expense | 2 |  |  | 11 |  |  |  | 11 |  |  | 19 |  |
Charged to other accounts(a) | 1 |  |  | 1 |  |  |  | 4 |  |  | 1 |  |
Net write-offs | (4) |  |  | (7) |  |  |  | (8) |  |  | (11) |  |
End of period | $ | 25 |  |  | $ | 27 |  |  |  | $ | 25 |  |  | $ | 27 |  |
(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 six months ended June 30, 2024 and 2023:
| June 30, 2024 |  | June 30, 2023
Ameren | Ameren Missouri |  | Ameren Illinois | Ameren | Ameren Missouri | Ameren Illinois
Investing: |  |  |  |  |  |  |  |
Accrued capital expenditures, including nuclear fuel expenditures | $ | 380 |  | $ | 232 |  |  | $ | 134 |  |  | $ | 325 |  | $ | 132 |  | $ | 173 |
Net realized and unrealized gain – nuclear decommissioning trust fund | 103 |  | 103 |  |  | — |  |  | 105 |  | 105 |  | — |
Return of investment in industrial development revenue bonds(a) | — |  | — |  |  | — |  |  | 240 | 240 | — |
Financing: |  |  |  |  |  |  |  |
Issuance of common stock for stock-based compensation | $ | 16 |  | $ | — |  |  | $ | — |  |  | $ | 37 |  | $ | — |  | $ | — |
Issuance of common stock under the DRPlus | 7 |  | — |  |  | — |  |  | 7 |  | — |  | — |
Termination of a financing obligation(a) | — |  | — |  |  | — |  |  | 240 | 240 | — |
(a)In January 2023, Ameren Missouri and Audrain County mutually agreed to terminate a financing obligation agreement related to the CT energy center in Audrain County, which was scheduled to expire in December 2023. No cash was exchanged in connection with the termination of the agreement as the $240 million principal amount of the financing obligation due from Ameren Missouri was equal to the amount of bond service payments due to Ameren Missouri.
Asset Retirement Obligation Disclosure | The following table provides a reconciliation of the beginning and ending carrying amount of AROs for the six months ended June 30, 2024:
| Ameren Missouri |  | Ameren Illinois |  |  |  | Ameren |
Balance at December 31, 2023 | $ | 787 |  | (a) | $ | 4 |  |  |  | (b) | $ | 791 |  | (a)
Liabilities incurred | 7 |  | (c) | — |  |  |  |  | 7 |  | (c)
Liabilities settled | (4) |  |  | (1) |  |  |  |  | (5) |  |
Accretion | 17 |  | (d) | — |  |  |  |  | 17 |  | (d)
Balance at June 30, 2024 | $ | 807 |  | (a) | $ | 3 |  |  |  | (b) | $ | 810 |  | (a)
(a)Balance included $19 million in “Other current liabilities” on the balance sheet as of both June 30, 2024, and December 31, 2023. (b)Included in “Other deferred credits and liabilities” on the balance sheet. (c)In June 2024, Ameren and Ameren Missouri recorded an ARO related to the decommissioning for the Cass County Solar Project. In addition, as a result of the 2024 CCR Rule, Ameren and Ameren Missouri recorded an immaterial increase to their AROs associated with CCR storage facilities. See Note 9 – Commitments and Contingencies for additional information. (d)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 and six months ended June 30, 2024 and 2023:
| Three Months |  | Six Months
| 2024 |  | 2023 |  | 2024 |  | 2023
Ameren Missouri | $ | 41 |  |  | $ | 39 |  |  | $ | 76 |  |  | $ | 73 |
Ameren Illinois | 28 |  |  | 26 |  |  | 65 |  |  | 63 |
Ameren | $ | 69 |  |  | $ | 65 |  |  | $ | 141 |  |  | $ | 136 |
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 and six months ended June 30, 2024 and 2023:
| Three Months |  | Six Months
| 2024 |  | 2023 |  | 2024 |  | 2023
Weighted-average Common Shares Outstanding – Basic | 266.7 |  |  | 262.6 |  |  | 266.5 |  |  | 262.4 |
Assumed settlement of performance share units and restricted stock units | 0.1 |  |  | 0.6 |  |  | 0.3 |  |  | 0.8 |
Weighted-average Common Shares Outstanding – Diluted(a) | 266.8 |  |  | 263.2 |  |  | 266.8 |  |  | 263.2 |
(a)There was an immaterial number of anti-dilutive performance share units excluded from the earnings per diluted share calculations for the three and six months ended June 30, 2024 and 2023. The outstanding forward sale agreements as of June 30, 2024 and 2023, were anti-dilutive for the three and six months ended June 30, 2024 and 2023, 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.

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