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Supplemental Information (Schedule of Excise Taxes) (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020
Accounting Policies [Line Items] |  |  |
Excise Tax Expense | $ 295 | $ 275 | $ 254
Union Electric Company |  |  |
Accounting Policies [Line Items] |  |  |
Excise Tax Expense | 162 | 150 | 139
Ameren Illinois Company |  |  |
Accounting Policies [Line Items] |  |  |
Excise Tax Expense | $ 133 | $ 125 | $ 115

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- Definition The amount of excise and sales taxes included in sales and revenues, which are then deducted as a cost of sales. Includes excise taxes, which are applied to specific types of transactions or items (such as gasoline or alcohol); and sales, use and value added taxes, which are applied to a broad class of revenue-producing transactions involving a wide range of goods and services. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03(1)) -URI http://asc.fasb.org/extlink&oid=123367319&loc=SL114868664-224227 + Details
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