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Revenue (Narrative) (Details) - USD ($) $ in Millions	3 Months Ended
Revenue (Narrative) (Details) - USD ($) $ in Millions	Mar. 31, 2025	Mar. 31, 2024	Dec. 31, 2024
Disaggregation of Revenue [Line Items]
Bad debt expense	$ 12	$ 10
Unbilled receivables	489		$ 584
Consumers Energy Company
Disaggregation of Revenue [Line Items]
Bad debt expense	12	$ 10
Unbilled receivables	$ 489		$ 584

- 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.

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