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Schedule II - Valuation And Qualifying Accounts | 12 Months Ended
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Dec. 31, 2025
SEC Schedule, 12-09, Valuation and Qualifying Accounts [Abstract] |
Valuation And Qualifying Accounts |
SCHEDULE II – VALUATION AND QUALIFYING ACCOUNTS FOR THE YEARS ENDED DECEMBER 31, 2025, 2024, AND 2023
(In millions) |  |  |  |  |  |  |  |  |  |
Column A |  | Column B |  | Column C |  | Column D |  | Column E
Description |  | Balance at Beginning of Period |  | (1) Charged to Costs and Expenses |  | (2) Charged to Other Accounts(a) |  | Deductions(b) |  | Balance at End of Period
Ameren: |  |  |  |  |  |  |  |  |  |
Deducted from assets – allowance for doubtful accounts: |  |  |  |  |  |  |  |  |  |
2025 |  | $ | 30 |  |  | $ | 51 |  |  | $ | 7 |  |  | $ | 49 |  |  | $ | 39 |
2024 |  | 30 |  |  | 39 |  |  | 8 |  |  | 47 |  |  | 30 |
2023 |  | 31 |  |  | 51 |  |  | 5 |  |  | 57 |  |  | 30 |
Ameren Missouri: |  |  |  |  |  |  |  |  |  |
Deducted from assets – allowance for doubtful accounts: |  |  |  |  |  |  |  |  |  |
2025 |  | $ | 12 |  |  | $ | 17 |  |  | $ | — |  |  | $ | 12 |  |  | $ | 17 |
2024 |  | 12 |  |  | 11 |  |  | — |  |  | 11 |  |  | 12 |
2023 |  | 13 |  |  | 11 |  |  | — |  |  | 12 |  |  | 12 |
Ameren Illinois: |  |  |  |  |  |  |  |  |  |
Deducted from assets – allowance for doubtful accounts: |  |  |  |  |  |  |  |  |  |
2025 |  | $ | 18 |  |  | $ | 34 |  |  | $ | 7 |  |  | $ | 37 |  |  | $ | 22 |
2024 |  | 18 |  |  | 28 |  |  | 8 |  |  | 36 |  |  | 18 |
2023 |  | 18 |  |  | 40 |  |  | 5 |  |  | 45 |  |  | 18 |
(a)Amounts associated with the allowance for doubtful accounts relate to the uncollectible account reserve associated with receivables purchased by Ameren Illinois from alternative retail electric suppliers, as required by the Illinois Public Utilities Act. (b)Uncollectible accounts charged off, less recoveries.

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- Definition The entire disclosure for valuation and qualifying accounts and reserves. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name Regulation S-X (SX) -Number 210 -Section 12 -Subsection 09 -Publisher SEC Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 235 -SubTopic 10 -Name Accounting Standards Codification -Section S50 -Paragraph 5 -Publisher FASB -URI https://asc.fasb.org/1943274/2147480738/235-10-S50-5 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Topic 235 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 4 -Subparagraph (SX 210.12-09) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480678/235-10-S99-4 + Details
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