XML 166 R99.htm IDEA: XBRL DOCUMENT
v3.22.4

Income Taxes (Schedule Of Net Operating Loss Carryforwards And Tax Credit Carryforwards) (Details) - USD ($) $ in Millions | Dec. 31, 2022 | Dec. 31, 2021
--- | --- | ---
Net operating loss carryforwards: |  |
Net operating loss carryforwards: | $ 47 | $ 65
Tax credit carryforwards: | 181 | 133
Federal |  |
Net operating loss carryforwards: |  |
Net operating loss carryforwards: | 11 | 34
Tax credit carryforwards: | 176 | 126
State |  |
Net operating loss carryforwards: |  |
Net operating loss carryforwards: | 36 | 31
Tax credit carryforwards: | 5 | 7
Union Electric Company |  |
Net operating loss carryforwards: |  |
Net operating loss carryforwards: | 4 | 3
Tax credit carryforwards: | 118 | 65
Union Electric Company | Federal |  |
Net operating loss carryforwards: |  |
Net operating loss carryforwards: | 3 | 2
Tax credit carryforwards: | 118 | 65
Union Electric Company | State |  |
Net operating loss carryforwards: |  |
Net operating loss carryforwards: | 1 | 1
Tax credit carryforwards: | 0 | 0
Ameren Illinois Company |  |
Net operating loss carryforwards: |  |
Net operating loss carryforwards: | 30 | 42
Tax credit carryforwards: | 4 | 4
Ameren Illinois Company | Federal |  |
Net operating loss carryforwards: |  |
Net operating loss carryforwards: | 4 | 17
Tax credit carryforwards: | 3 | 3
Ameren Illinois Company | State |  |
Net operating loss carryforwards: |  |
Net operating loss carryforwards: | 26 | 25
Tax credit carryforwards: | 1 | 1
Other |  |
Net operating loss carryforwards: |  |
Net operating loss carryforwards: | 13 | 20
Tax credit carryforwards: | 59 | 64
Other | Federal |  |
Net operating loss carryforwards: |  |
Net operating loss carryforwards: | 4 | 15
Tax credit carryforwards: | 55 | 58
Other | State |  |
Net operating loss carryforwards: |  |
Net operating loss carryforwards: | 9 | 5
Tax credit carryforwards: | $ 4 | $ 6

X
- Definition Amount of operating loss carryforward, before tax effects, available to reduce future taxable income under enacted tax laws. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 3 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=121826272&loc=d3e32559-109319 + 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 No definition available. + 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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 3 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=121826272&loc=d3e32559-109319 + 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: |