v3.25.4

Regulatory Matters (Narrative) (Details) $ in Millions	1 Months Ended									4 Months Ended	12 Months Ended
	Jan. 31, 2026 USD ($)	Sep. 30, 2025 USD ($)	Jul. 31, 2025 USD ($)	Mar. 31, 2025 USD ($)	Dec. 31, 2024 USD ($)	Oct. 31, 2024 USD ($)	Jul. 31, 2024 USD ($)	May 31, 2024 USD ($)	Apr. 30, 2024 USD ($)	Dec. 31, 2025 USD ($) facility	Dec. 31, 2025 USD ($) facility	Dec. 31, 2024 USD ($)	Dec. 31, 2023 USD ($)	Dec. 31, 2022 USD ($)	Dec. 31, 2016 unit	Dec. 31, 2015 unit	Dec. 31, 2013 USD ($)
Public Utilities, General Disclosures [Line Items]
Regulatory assets					$ 3,569.0					$ 3,355.0	$ 3,355.0	$ 3,569.0
Operating Revenue											8,539.0	7,515.0	$ 7,462.0
ASP gain
Public Utilities, General Disclosures [Line Items]
Gain on disposition of assets									$ 110.0
Amount credited to customers							$ 82.5
Ludington Overhaul Contract Dispute
Public Utilities, General Disclosures [Line Items]
Cash expenditures											30.0
Consumers Energy Company
Public Utilities, General Disclosures [Line Items]
Regulatory assets					3,569.0					$ 3,355.0	3,355.0	3,569.0
Operating Revenue											$ 8,132.0	7,200.0	$ 7,166.0
Consumers Energy Company | Renewable energy grant
Public Utilities, General Disclosures [Line Items]
Proceeds from government grant																	$ 69.0
Consumers Energy Company | MGP sites
Public Utilities, General Disclosures [Line Items]
Number of former MGPs | facility										23	23
Regulatory asset collection period										10 years	10 years
Consumers Energy Company | Gas-Fueled Electric Generation
Public Utilities, General Disclosures [Line Items]
Number of units retired | unit																3
Consumers Energy Company | Coal-Fueled Electric Generation
Public Utilities, General Disclosures [Line Items]
Number of units retired | unit															7
Consumers Energy Company | Energy Waste Reduction Plan Incentive
Public Utilities, General Disclosures [Line Items]
Regulatory assets					64.0					$ 64.0	$ 64.0	64.0
Consumers Energy Company | J.H. Campbell Generating Units
Public Utilities, General Disclosures [Line Items]
Regulatory assets														$ 1,300.0
Operating Revenue										77.0
Rate of return on equity authorized														9.00%
Financial impact of emergency order										93.0
Consumers Energy Company | J.H. Campbell Generating Units | Subsequent Event
Public Utilities, General Disclosures [Line Items]
Operating Revenue	$ 78.0
Financial impact of emergency order	42.0
Energy Waste Reduction Plan Incentive | Consumers Energy Company
Public Utilities, General Disclosures [Line Items]
Operating Revenue											64.0
Energy Waste Reduction Plan Incentive | Consumers Energy Company | Subsequent Event
Public Utilities, General Disclosures [Line Items]
Authorized recovery collection	$ 64.0
PSCR underrecoveries | Consumers Energy Company
Public Utilities, General Disclosures [Line Items]
PSCR underrecoveries					0.0					$ 38.0	$ 38.0	$ 0.0		$ 401.0
Gas Rate Case | Consumers Energy Company
Public Utilities, General Disclosures [Line Items]
Requested annual rate increase					$ 248.0
Requested annual rate increase, as a percent					10.25%
Amended requested annual rate increase			$ 217.0
Gas Rate Case | Consumers Energy Company | ASP gain
Public Utilities, General Disclosures [Line Items]
Gain on sale utilized as offset							$ 27.5
Electric Rate Case
Public Utilities, General Disclosures [Line Items]
Amended requested annual rate increase						$ 277.0
Electric Rate Case | Consumers Energy Company
Public Utilities, General Disclosures [Line Items]
Rate of return on equity authorized		9.80%		9.90%
Requested annual rate increase								$ 325.0
Requested annual rate increase, as a percent								10.25%
Surcharge for the recovery of excess distribution investments				$ 22.0
Additional annual rate increase authorized		$ 157.5		$ 176.0
Electric Rate Case, First Component | Consumers Energy Company
Public Utilities, General Disclosures [Line Items]
Requested annual rate increase								$ 303.0
Electric Rate Case, Second Component | Consumers Energy Company
Public Utilities, General Disclosures [Line Items]
Surcharge for the recovery of excess distribution investments								$ 22.0

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