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Supplemental Information (Tables) | 6 Months Ended
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Jun. 30, 2022
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, 2022, and December 31, 2021:
| June 30, 2022 |  |  | December 31, 2021
Ameren |  | Ameren Missouri |  | Ameren Illinois |  |  | Ameren |  | Ameren Missouri |  | Ameren Illinois
“Cash and cash equivalents” | $ | 7 |  |  | $ | — |  |  | $ | — |  |  |  | $ | 8 |  |  | $ | — |  |  | $ | — |
Restricted cash included in “Other current assets” | 7 |  |  | 2 |  |  | 4 |  |  |  | 16 |  |  | 4 |  |  | 6 |
Restricted cash included in “Other assets” | 142 |  |  | — |  |  | 142 |  |  |  | 127 |  |  | — |  |  | 127 |
Restricted cash included in “Nuclear decommissioning trust fund” | 5 |  |  | 5 |  |  | — |  |  |  | 4 |  |  | 4 |  |  | — |
Total cash, cash equivalents, and restricted cash | $ | 161 |  |  | $ | 7 |  |  | $ | 146 |  |  |  | $ | 155 |  |  | $ | 8 |  |  | $ | 133 |
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, 2022 and 2021:
| Three Months |  | Six Months
| 2022 |  | 2021 |  |  | 2022 |  | 2021 |
Ameren: |  |  |  |  |  |  |  |  |
Beginning of period | $ | 28 |  |  | $ | 47 |  |  |  | $ | 29 |  |  | $ | 50 |  |
Bad debt expense | 7 |  |  | (3) |  |  |  | 11 |  |  | 1 |  |
Net write-offs | (5) |  |  | (2) |  |  |  | (10) |  |  | (9) |  |
End of period | $ | 30 |  |  | $ | 42 |  |  |  | $ | 30 |  |  | $ | 42 |  |
Ameren Missouri: |  |  |  |  |  |  |  |  |
Beginning of period | $ | 11 |  |  | $ | 15 |  |  |  | $ | 13 |  |  | $ | 16 |  |
Bad debt expense | 2 |  |  | 2 |  |  |  | 3 |  |  | 3 |  |
Net write-offs | (1) |  |  | (1) |  |  |  | (4) |  |  | (3) |  |
End of period | $ | 12 |  |  | $ | 16 |  |  |  | $ | 12 |  |  | $ | 16 |  |
Ameren Illinois:(a) |  |  |  |  |  |  |  |  |
Beginning of period | $ | 17 |  |  | $ | 32 |  |  |  | $ | 16 |  |  | $ | 34 |  |
Bad debt expense | 5 |  |  | (5) |  | (b) |  | 8 |  |  | (2) |  | (b)
Net write-offs | (4) |  |  | (1) |  |  |  | (6) |  |  | (6) |  |
End of period | $ | 18 |  |  | $ | 26 |  |  |  | $ | 18 |  |  | $ | 26 |  |
(a)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. (b)In the three and six months ended June 30, 2021, Ameren Illinois’ bad debt expense was reduced as a result of state funding received for customer bill assistance.
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, 2022 and 2021:
| June 30, 2022 |  | June 30, 2021
Ameren | Ameren Missouri |  | Ameren Illinois | Ameren | Ameren Missouri | Ameren Illinois
Investing |  |  |  |  |  |  |  |
Accrued capital expenditures | $ | 408 |  | $ | 204 |  |  | $ | 193 |  |  | $ | 434 |  | $ | 259 |  | $ | 174 |
Net realized and unrealized gain/(loss) – nuclear decommissioning trust fund | (211) |  | (211) |  |  | — |  |  | 85 |  | 85 |  | — |
Financing |  |  |  |  |  |  |  |
Issuance of common stock for stock-based compensation | $ | 31 |  | $ | — |  |  | $ | — |  |  | $ | 33 |  | $ | — |  | $ | — |
Issuance of common stock under the DRPlus | 8 |  | — |  |  | — |  |  | — |  | — |  | — |
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, 2022:
| Ameren Missouri |  | Ameren Illinois |  |  |  | Ameren |
Balance at December 31, 2021 | $ | 760 |  | (a) | $ | 4 |  |  |  | (b) | $ | 764 |  | (a)
Accretion | 15 |  | (c) | — |  |  |  |  | 15 |  | (c)
Change in estimates | 2 |  |  | — |  |  |  |  | 2 |  |
Balance at June 30, 2022 | $ | 777 |  | (a) | $ | 4 |  |  |  | (b) | $ | 781 |  | (a)
(a)Balance included $7 million in “Other current liabilities” on the balance sheet as of both June 30, 2022, and December 31, 2021. (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 and six months ended June 30, 2022 and 2021:
| Three Months |  | Six Months
| 2022 |  | 2021 |  | 2022 |  | 2021
Ameren Missouri | $ | 39 |  |  | $ | 35 |  |  | $ | 73 |  |  | $ | 66 |
Ameren Illinois | 28 |  |  | 27 |  |  | 73 |  |  | 66 |
Ameren | $ | 67 |  |  | $ | 62 |  |  | $ | 146 |  |  | $ | 132 |
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, 2022 and 2021:
| Three Months |  | Six Months
| 2022 |  | 2021 |  | 2022 |  | 2021
Weighted-average Common Shares Outstanding – Basic | 258.2 |  |  | 256.1 |  |  | 258.0 |  |  | 255.2 |
Assumed settlement of performance share units and restricted stock units | 1.0 |  |  | 1.1 |  |  | 1.1 |  |  | 1.3 |
Dilutive effect of forward sale agreements | 0.2 |  |  | — |  |  | 0.1 |  |  | — |
Weighted-average Common Shares Outstanding – Diluted(a) | 259.4 |  |  | 257.2 |  |  | 259.2 |  |  | 256.5 |
(a)There was an immaterial number of anti-dilutive securities excluded from the earnings per diluted share calculations for the three and six months ended June 30, 2022. There were no anti-dilutive securities excluded from the earnings per diluted share calculations for the three and six months ended June 30, 2021.

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