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Revenue (Narrative) (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
Revenue (Narrative) (Details) - USD ($) $ in Millions	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023	Dec. 31, 2023
Disaggregation of Revenue [Line Items]
Bad debt expense	$ 7	$ 15	$ 24	$ 32
Unbilled receivables	391		391		$ 494
Consumers Energy Company
Disaggregation of Revenue [Line Items]
Bad debt expense	7	$ 15	24	$ 32
Unbilled receivables	$ 391		$ 391		$ 494

- 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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