XML 168 R103.htm IDEA: XBRL DOCUMENT
v3.25.0.1

Income Taxes (Schedule Of Net Operating Loss Carryforwards And Tax Credit Carryforwards) (Details) - USD ($) $ in Millions | Dec. 31, 2024 | Dec. 31, 2023
--- | --- | ---
Net operating loss carryforwards: |  |
Net operating loss carryforwards: | $ 93 | $ 42
Tax credit carryforwards: | 410 | 176
Federal |  |
Net operating loss carryforwards: |  |
Net operating loss carryforwards: | 30 | 0
Tax credit carryforwards: | 408 | 174
State |  |
Net operating loss carryforwards: |  |
Net operating loss carryforwards: | 63 | 42
Tax credit carryforwards: | 2 | 2
Ameren Missouri |  |
Net operating loss carryforwards: |  |
Net operating loss carryforwards: | 0 | 0
Tax credit carryforwards: | 355 | 124
Ameren Missouri | Federal |  |
Net operating loss carryforwards: |  |
Net operating loss carryforwards: | 0 | 0
Tax credit carryforwards: | 355 | 124
Ameren Missouri | State |  |
Net operating loss carryforwards: |  |
Net operating loss carryforwards: | 0 | 0
Tax credit carryforwards: | 0 | 0
Ameren Illinois |  |
Net operating loss carryforwards: |  |
Net operating loss carryforwards: | 34 | 26
Tax credit carryforwards: | 11 | 7
Ameren Illinois | Federal |  |
Net operating loss carryforwards: |  |
Net operating loss carryforwards: | 0 | 0
Tax credit carryforwards: | 9 | 5
Ameren Illinois | State |  |
Net operating loss carryforwards: |  |
Net operating loss carryforwards: | 34 | 26
Tax credit carryforwards: | 2 | 2
Other |  |
Net operating loss carryforwards: |  |
Net operating loss carryforwards: | 59 | 16
Tax credit carryforwards: | 44 | 45
Other | Federal |  |
Net operating loss carryforwards: |  |
Net operating loss carryforwards: | 30 | 0
Tax credit carryforwards: | 44 | 45
Other | State |  |
Net operating loss carryforwards: |  |
Net operating loss carryforwards: | 29 | 16
Tax credit carryforwards: | $ 0 | $ 0

X
- Definition Amount of operating loss carryforward, before tax effects, available to reduce future taxable income under enacted tax laws. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 740 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 3 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482685/740-10-50-3 + Details
Name: | us-gaap_OperatingLossCarryforwards
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 740 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 3 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482685/740-10-50-3 + Details
Name: | us-gaap_OperatingLossCarryforwardsLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition The amount of the tax credit carryforward, before tax effects, available to reduce future taxable income under enacted tax laws. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 740 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 3 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482685/740-10-50-3 + Details
Name: | us-gaap_TaxCreditCarryforwardAmount
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Details
Name: | us-gaap_IncomeTaxAuthorityAxis=us-gaap_InternalRevenueServiceIRSMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_IncomeTaxAuthorityAxis=us-gaap_StateAndLocalJurisdictionMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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: |

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