XML 133 R60.htm IDEA: XBRL DOCUMENT
v3.25.4

Property And Plant, Net (Schedule Of Property And Plant, Net) (Details) - USD ($) $ in Millions | Dec. 31, 2025 | Dec. 31, 2024
--- | --- | ---
Property, Plant and Equipment [Line Items] |  |
Accumulated depreciation and amortization | $ 16,569 | $ 16,495
Property, plant, and equipment, net | 39,313 | 36,304
Depreciable Property, Plant And Equipment |  |
Property, Plant and Equipment [Line Items] |  |
Property and plant, at original cost | 52,870 | 50,790
Property, plant, and equipment, net | 36,301 | 34,295
Coal Fired Electric Generation Equipment |  |
Property, Plant and Equipment [Line Items] |  |
Property and plant, at original cost | 3,640 | 3,556
Natural Gas and Oil Fired Electric Generation Equipment [Member] |  |
Property, Plant and Equipment [Line Items] |  |
Property and plant, at original cost | 948 | 938
Nuclear |  |
Property, Plant and Equipment [Line Items] |  |
Property and plant, at original cost | 6,255 | 5,931
Renewable Electric Generation Equipment |  |
Property, Plant and Equipment [Line Items] |  |
Property and plant, at original cost | 3,091 | 2,920
Electric distribution |  |
Property, Plant and Equipment [Line Items] |  |
Property and plant, at original cost | 18,963 | 17,629
Electric transmission |  |
Property, Plant and Equipment [Line Items] |  |
Property and plant, at original cost | 10,910 | 10,162
Natural gas |  |
Property, Plant and Equipment [Line Items] |  |
Property and plant, at original cost | 5,479 | 5,197
Other |  |
Property, Plant and Equipment [Line Items] |  |
Property and plant, at original cost | 3,584 | 4,457
Nuclear fuel in progress |  |
Property, Plant and Equipment [Line Items] |  |
Property and plant, at original cost | 194 | 268
Oil Fired Electric Generation Equipment [Member] |  |
Property, Plant and Equipment [Line Items] |  |
Property and plant, at original cost | 30 |
Other |  |
Property, Plant and Equipment [Line Items] |  |
Property and plant, at original cost | 2,818 | 1,741
Ameren Missouri |  |
Property, Plant and Equipment [Line Items] |  |
Accumulated depreciation and amortization | 11,090 | 10,875
Property, plant, and equipment, net | 20,604 | 18,788
Ameren Missouri | Depreciable Property, Plant And Equipment |  |
Property, Plant and Equipment [Line Items] |  |
Property and plant, at original cost | 29,568 | 28,404
Property, plant, and equipment, net | 18,478 | 17,529
Ameren Missouri | Coal Fired Electric Generation Equipment |  |
Property, Plant and Equipment [Line Items] |  |
Property and plant, at original cost | 3,640 | 3,556
Ameren Missouri | Natural Gas and Oil Fired Electric Generation Equipment [Member] |  |
Property, Plant and Equipment [Line Items] |  |
Property and plant, at original cost | 948 | 938
Ameren Missouri | Nuclear |  |
Property, Plant and Equipment [Line Items] |  |
Property and plant, at original cost | 6,255 | 5,931
Ameren Missouri | Renewable Electric Generation Equipment |  |
Property, Plant and Equipment [Line Items] |  |
Property and plant, at original cost | 3,072 | 2,901
Ameren Missouri | Electric distribution |  |
Property, Plant and Equipment [Line Items] |  |
Property and plant, at original cost | 10,205 | 9,469
Ameren Missouri | Electric transmission |  |
Property, Plant and Equipment [Line Items] |  |
Property and plant, at original cost | 2,479 | 2,406
Ameren Missouri | Natural gas |  |
Property, Plant and Equipment [Line Items] |  |
Property and plant, at original cost | 837 | 776
Ameren Missouri | Other |  |
Property, Plant and Equipment [Line Items] |  |
Property and plant, at original cost | 2,132 | 2,427
Ameren Missouri | Nuclear fuel in progress |  |
Property, Plant and Equipment [Line Items] |  |
Property and plant, at original cost | 194 | 268
Ameren Missouri | Other |  |
Property, Plant and Equipment [Line Items] |  |
Property and plant, at original cost | 1,932 | 991
Ameren Illinois |  |
Property, Plant and Equipment [Line Items] |  |
Accumulated depreciation and amortization | 5,219 | 5,184
Property, plant, and equipment, net | 16,567 | 15,530
Ameren Illinois | Depreciable Property, Plant And Equipment |  |
Property, Plant and Equipment [Line Items] |  |
Property and plant, at original cost | 21,078 | 20,095
Property, plant, and equipment, net | 15,859 | 14,911
Ameren Illinois | Coal Fired Electric Generation Equipment |  |
Property, Plant and Equipment [Line Items] |  |
Property and plant, at original cost | 0 | 0
Ameren Illinois | Natural Gas and Oil Fired Electric Generation Equipment [Member] |  |
Property, Plant and Equipment [Line Items] |  |
Property and plant, at original cost | 0 | 0
Ameren Illinois | Nuclear |  |
Property, Plant and Equipment [Line Items] |  |
Property and plant, at original cost | 0 | 0
Ameren Illinois | Renewable Electric Generation Equipment |  |
Property, Plant and Equipment [Line Items] |  |
Property and plant, at original cost | 19 | 19
Ameren Illinois | Electric distribution |  |
Property, Plant and Equipment [Line Items] |  |
Property and plant, at original cost | 8,758 | 8,160
Ameren Illinois | Electric transmission |  |
Property, Plant and Equipment [Line Items] |  |
Property and plant, at original cost | 6,247 | 5,725
Ameren Illinois | Natural gas |  |
Property, Plant and Equipment [Line Items] |  |
Property and plant, at original cost | 4,642 | 4,421
Ameren Illinois | Other |  |
Property, Plant and Equipment [Line Items] |  |
Property and plant, at original cost | 1,412 | 1,770
Ameren Illinois | Nuclear fuel in progress |  |
Property, Plant and Equipment [Line Items] |  |
Property and plant, at original cost | 0 | 0
Ameren Illinois | Other |  |
Property, Plant and Equipment [Line Items] |  |
Property and plant, at original cost | 708 | 619
Other |  |
Property, Plant and Equipment [Line Items] |  |
Accumulated depreciation and amortization | 260 | 436
Property, plant, and equipment, net | 2,142 | 1,986
Other | Depreciable Property, Plant And Equipment |  |
Property, Plant and Equipment [Line Items] |  |
Property and plant, at original cost | 2,224 | 2,291
Property, plant, and equipment, net | 1,964 | 1,855
Other | Coal Fired Electric Generation Equipment |  |
Property, Plant and Equipment [Line Items] |  |
Property and plant, at original cost | 0 | 0
Other | Natural Gas and Oil Fired Electric Generation Equipment [Member] |  |
Property, Plant and Equipment [Line Items] |  |
Property and plant, at original cost | 0 | 0
Other | Nuclear |  |
Property, Plant and Equipment [Line Items] |  |
Property and plant, at original cost | 0 | 0
Other | Renewable Electric Generation Equipment |  |
Property, Plant and Equipment [Line Items] |  |
Property and plant, at original cost | 0 | 0
Other | Electric distribution |  |
Property, Plant and Equipment [Line Items] |  |
Property and plant, at original cost | 0 | 0
Other | Electric transmission |  |
Property, Plant and Equipment [Line Items] |  |
Property and plant, at original cost | 2,184 | 2,031
Other | Natural gas |  |
Property, Plant and Equipment [Line Items] |  |
Property and plant, at original cost | 0 | 0
Other | Other |  |
Property, Plant and Equipment [Line Items] |  |
Property and plant, at original cost | 40 | 260
Other | Nuclear fuel in progress |  |
Property, Plant and Equipment [Line Items] |  |
Property and plant, at original cost | 0 | 0
Other | Other |  |
Property, Plant and Equipment [Line Items] |  |
Property and plant, at original cost | $ 178 | $ 131
Minimum | Electric distribution |  |
Property, Plant and Equipment [Line Items] |  |
Property, Plant and Equipment, Useful Life | 20 years |
Minimum | Electric transmission |  |
Property, Plant and Equipment [Line Items] |  |
Property, Plant and Equipment, Useful Life | 50 years |
Minimum | Natural gas |  |
Property, Plant and Equipment [Line Items] |  |
Property, Plant and Equipment, Useful Life | 15 years |
Minimum | Other |  |
Property, Plant and Equipment [Line Items] |  |
Property, Plant and Equipment, Useful Life | 2 years |
Minimum | Electric generation |  |
Property, Plant and Equipment [Line Items] |  |
Property, Plant and Equipment, Useful Life | 5 years |
Maximum | Electric distribution |  |
Property, Plant and Equipment [Line Items] |  |
Property, Plant and Equipment, Useful Life | 80 years |
Maximum | Electric transmission |  |
Property, Plant and Equipment [Line Items] |  |
Property, Plant and Equipment, Useful Life | 75 years |
Maximum | Natural gas |  |
Property, Plant and Equipment [Line Items] |  |
Property, Plant and Equipment, Useful Life | 80 years |
Maximum | Other |  |
Property, Plant and Equipment [Line Items] |  |
Property, Plant and Equipment, Useful Life | 55 years |
Maximum | Electric generation |  |
Property, Plant and Equipment [Line Items] |  |
Property, Plant and Equipment, Useful Life | 72 years |
Maximum | Ameren Missouri | Electric generation |  |
Property, Plant and Equipment [Line Items] |  |
Property, Plant and Equipment, Useful Life | 150 years |

X
- Definition Amount of accumulated depreciation, depletion and amortization for physical assets used in the normal conduct of business to produce goods and services. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 944 -SubTopic 210 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(a)(8)(b)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147478777/944-210-S99-1 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 210 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(14)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480566/210-10-S99-1 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (c) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482099/360-10-50-1 + Details
Name: | us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Amount before accumulated depreciation, depletion and amortization of physical assets used in the normal conduct of business and not intended for resale. Examples include, but are not limited to, land, buildings, machinery and equipment, office equipment, and furniture and fixtures. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 944 -SubTopic 210 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(a)(8)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147478777/944-210-S99-1 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 210 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(13)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480566/210-10-S99-1 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 360 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482099/360-10-50-1 + Details
Name: | us-gaap_PropertyPlantAndEquipmentGross
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 842 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 7A -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org/1943274/2147478964/842-20-50-7A + Details
Name: | us-gaap_PropertyPlantAndEquipmentLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Amount after accumulated depreciation, depletion and amortization of physical assets used in the normal conduct of business to produce goods and services and not intended for resale. Examples include, but are not limited to, land, buildings, machinery and equipment, office equipment, and furniture and fixtures. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Section 50 -Paragraph 1 -SubTopic 10 -Topic 360 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482099/360-10-50-1 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 842 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 7A -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org/1943274/2147478964/842-20-50-7A Reference 3: http://www.xbrl.org/2003/role/exampleRef -Topic 852 -SubTopic 10 -Name Accounting Standards Codification -Section 55 -Paragraph 10 -Publisher FASB -URI https://asc.fasb.org/1943274/2147481372/852-10-55-10 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Topic 944 -SubTopic 210 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(a)(8)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147478777/944-210-S99-1 Reference 5: http://www.xbrl.org/2003/role/disclosureRef -Topic 942 -SubTopic 360 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Publisher FASB -URI https://asc.fasb.org/1943274/2147478451/942-360-50-1 + Details
Name: | us-gaap_PropertyPlantAndEquipmentNet
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Useful life of long lived, physical assets used in the normal conduct of business and not intended for resale, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. Examples include, but not limited to, land, buildings, machinery and equipment, office equipment, furniture and fixtures, and computer equipment. + References No definition available. + Details
Name: | us-gaap_PropertyPlantAndEquipmentUsefulLife
Namespace Prefix: | us-gaap_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | instant

X
- Details
Name: | us-gaap_PropertyPlantAndEquipmentByTypeAxis=aee_DepreciablePropertyPlantAndEquipmentMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_PropertyPlantAndEquipmentByTypeAxis=aee_CoalFiredElectricGenerationEquipmentMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_PropertyPlantAndEquipmentByTypeAxis=aee_NaturalGasAndOilFiredElectricGenerationEquipmentMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_PropertyPlantAndEquipmentByTypeAxis=aee_NuclearPoweredElectricGenerationEquipmentMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_PropertyPlantAndEquipmentByTypeAxis=aee_RenewableElectricGenerationEquipmentMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_PropertyPlantAndEquipmentByTypeAxis=aee_ElectricdistributionequipmentMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_PropertyPlantAndEquipmentByTypeAxis=aee_ElectrictransmissionequipmentMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_PropertyPlantAndEquipmentByTypeAxis=us-gaap_GasDistributionEquipmentMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_PropertyPlantAndEquipmentByTypeAxis=us-gaap_PropertyPlantAndEquipmentOtherTypesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_PropertyPlantAndEquipmentByTypeAxis=us-gaap_NuclearFuelMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_PropertyPlantAndEquipmentByTypeAxis=aee_OilFiredElectricGenerationEquipmentMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_PropertyPlantAndEquipmentByTypeAxis=aee_ConstructionWorkInProgressOtherMember
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: |

X
- Details
Name: | srt_RangeAxis=srt_MinimumMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_PropertyPlantAndEquipmentByTypeAxis=us-gaap_ElectricGenerationEquipmentMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_RangeAxis=srt_MaximumMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |