v3.25.4

Plant, Property, and Equipment (Summary of Accumulated Depreciation and Amortization) (Details) - USD ($) $ in Millions | Dec. 31, 2025 | Dec. 31, 2024
--- | --- | ---
Public Utility, Property, Plant and Equipment [Line Items] |  |
Accumulated depreciation and amortization | $ 10,135 | $ 9,569
Consumers Energy Company |  |
Public Utility, Property, Plant and Equipment [Line Items] |  |
Consumers accumulated depreciation and amortization | 9,842 | 9,310
Non-utility plant assets |  |
Public Utility, Property, Plant and Equipment [Line Items] |  |
Accumulated depreciation and amortization | 297 | 262
Non-utility plant assets | Consumers Energy Company |  |
Public Utility, Property, Plant and Equipment [Line Items] |  |
Consumers accumulated depreciation and amortization | 4 | 3
Utility plant assets |  |
Public Utility, Property, Plant and Equipment [Line Items] |  |
Accumulated depreciation and amortization | 9,838 | 9,307
Utility plant assets | Consumers Energy Company |  |
Public Utility, Property, Plant and Equipment [Line Items] |  |
Consumers accumulated depreciation and amortization | $ 9,838 | $ 9,307

X
- Definition Public Utilities, Property, Plant, and Equipment And Finance Lease Right-Of-Use Asset, Accumulated Depreciation And Amortization + References No definition available. + Details
Name: | cms_PublicUtilitiesPropertyPlantandEquipmentAndFinanceLeaseRightOfUseAssetAccumulatedDepreciationAndAmortization
Namespace Prefix: | cms_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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 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_PublicUtilityPropertyPlantAndEquipmentLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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

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

X
- Details
Name: | us-gaap_PublicUtilityAxis=cms_UtilityPlantAssetsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |