XML 60 R41.htm IDEA: XBRL DOCUMENT
v3.24.3

Regulatory Matters - (Narrative) (Details) - USD ($) $ in Millions | 1 Months Ended
--- | ---
May 31, 2024 | Mar. 31, 2024 | Sep. 30, 2023 | May 31, 2023
Public Utilities, General Disclosures [Line Items] |  |  |  |
Settlement agreement penalty payment | $ 1 |  |  |
Minimum settlement returns to customers | $ 3 |  |  |
Electric Rate Case | Consumers Energy Company |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |
Requested annual rate increase |  |  |  | $ 216
Requested annual rate increase, as a percent |  |  |  | 10.25%
Amended requested annual rate increase |  |  | $ 169 |
Additional annual rate increase authorized |  | $ 92 |  |
Surcharge for the recovery of excess distribution investments |  | $ 9 |  |
Rate of return on equity authorized |  | 9.90% |  |

X
- Definition Public Utilities, Surcharge For Recovery Of Excess Distribution Investments + References No definition available. + Details
Name: | cms_PublicUtilitiesSurchargeForRecoveryOfExcessDistributionInvestments
Namespace Prefix: | cms_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Settlement Agreement, Minimum Returns To Customers + References No definition available. + Details
Name: | cms_SettlementAgreementMinimumReturnsToCustomers
Namespace Prefix: | cms_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Settlement Agreement, Payment Penalty + References No definition available. + Details
Name: | cms_SettlementAgreementPaymentPenalty
Namespace Prefix: | cms_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Amount of public utility's approved rate increase (decrease) by regulatory agency. + References No definition available. + Details
Name: | us-gaap_PublicUtilitiesApprovedRateIncreaseDecreaseAmount
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Percentage of public utility's approved return on equity. + References No definition available. + Details
Name: | us-gaap_PublicUtilitiesApprovedReturnOnEquityPercentage
Namespace Prefix: | us-gaap_
Data Type: | dtr-types:percentItemType
Balance Type: | na
Period Type: | duration

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

X
- Definition Amount of public utility's amended requested rate increase (decrease) with regulatory agency. + References No definition available. + Details
Name: | us-gaap_PublicUtilitiesRequestedRateIncreaseDecreaseAmendedAmount
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Amount of public utility's requested rate increase (decrease) with regulatory agency. + References No definition available. + Details
Name: | us-gaap_PublicUtilitiesRequestedRateIncreaseDecreaseAmount
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Percentage of public utility's requested return on equity. + References No definition available. + Details
Name: | us-gaap_PublicUtilitiesRequestedReturnOnEquityPercentage
Namespace Prefix: | us-gaap_
Data Type: | dtr-types:percentItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | us-gaap_PublicUtilitiesRegulatoryProceedingAxis=cms_ElectricRateCaseMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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