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Regulatory Matters (Schedule of Assets and Liabilities for PSCR and GCR Over/(Under) Recoveries) (Details) - USD ($) $ in Millions | Dec. 31, 2023 | Dec. 31, 2022
--- | --- | ---
Public Utilities, General Disclosures [Line Items] |  |
Accrued rate refunds | $ 54 | $ 0
Consumers Energy Company |  |
Public Utilities, General Disclosures [Line Items] |  |
Accounts receivable and accrued revenue | 0 | 409
Accrued rate refunds | 54 | 0
Consumers Energy Company | PSCR underrecoveries |  |
Public Utilities, General Disclosures [Line Items] |  |
PSCR underrecoveries | 0 | 401
Accrued rate refunds | 10 | 0
Consumers Energy Company | GCR underrecoveries |  |
Public Utilities, General Disclosures [Line Items] |  |
GCR underrecoveries | 0 | 8
Accrued rate refunds | $ 44 | $ 0

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- Definition Unrecovered Power Supply Costs + References No definition available. + Details
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- Definition Carrying amount as of the balance sheet date of capitalized fuel costs of a regulated entity that are expected to be recoverable through rate adjustments within one year or the normal operating cycle, if longer. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 980 -SubTopic 340 -Name Accounting Standards Codification -Section 25 -Paragraph 1 -Publisher FASB -URI https://asc.fasb.org//1943274/2147482000/980-340-25-1 + Details
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- Definition Discloses the amount of unrecovered costs for purchased gas. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 980 -SubTopic 340 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Publisher FASB -URI https://asc.fasb.org//1943274/2147481878/980-340-50-1 + Details
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