XML 181 R116.htm IDEA: XBRL DOCUMENT
v3.25.0.1

Supplemental Information (Schedule of Excise Taxes) (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
Accounting Policies [Line Items] |  |  |
Excise Tax Expense | $ 299 | $ 287 | $ 295
Ameren Missouri |  |  |
Accounting Policies [Line Items] |  |  |
Excise Tax Expense | 169 | 166 | 162
Ameren Illinois |  |  |
Accounting Policies [Line Items] |  |  |
Excise Tax Expense | $ 130 | $ 121 | $ 133

X
- Definition [Line Items] for Accounting Policies [Table] + References No definition available. + Details
Name: | aee_AccountingPoliciesLineItems
Namespace Prefix: | aee_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- 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 -Topic 220 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03(1)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147483621/220-10-S99-2 + Details
Name: | us-gaap_ExciseAndSalesTaxes
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Details
Name: | dei_LegalEntityAxis=aee_UnionElectricCompanyMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | dei_LegalEntityAxis=aee_AmerenIllinoisCompanyMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |