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Revenue (Narrative) (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
Revenue (Narrative) (Details) - USD ($) $ in Millions	Jun. 30, 2024	Jun. 30, 2023	Jun. 30, 2024	Jun. 30, 2023	Dec. 31, 2023
Disaggregation of Revenue [Line Items]
Bad debt expense	$ 7	$ 8	$ 17	$ 17
Unbilled receivables	446		446		$ 494
Consumers Energy Company
Disaggregation of Revenue [Line Items]
Bad debt expense	7	$ 8	17	$ 17
Unbilled receivables	$ 446		$ 446		$ 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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