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Retirement Benefits (Tables)
 3 Months Ended
Mar. 31, 2024
Defined Benefit Plan Disclosure [Line Items]  
Schedule of Net Benefit Costs Presented in the following table are the costs (credits) and other changes in plan assets and benefit obligations incurred in CMS Energy’s and Consumers’ retirement benefit plans:
In Millions
DB Pension PlansOPEB Plan
Three Months Ended March 312024202320242023
CMS Energy, including Consumers
Net periodic credit
Service cost$7 $7 $3 $3 
Interest cost26 27 11 11 
Expected return on plan assets(59)(55)(29)(26)
Amortization of:
Net loss3 3 1 3 
Prior service cost (credit)1 1 (8)(10)
Settlement loss3 2 — — 
Net periodic credit$(19)$(15)$(22)$(19)
Consumers
Net periodic credit
Service cost$7 $7 $3 $3 
Interest cost24 25 10 11 
Expected return on plan assets(55)(52)(27)(24)
Amortization of:
Net loss3 3 1 3 
Prior service cost (credit)1 1 (7)(10)
Settlement loss3 2 — — 
Net periodic credit$(17)$(14)$(20)$(17)
Consumers Energy Company  
Defined Benefit Plan Disclosure [Line Items]  
Schedule of Net Benefit Costs Presented in the following table are the costs (credits) and other changes in plan assets and benefit obligations incurred in CMS Energy’s and Consumers’ retirement benefit plans:
In Millions
DB Pension PlansOPEB Plan
Three Months Ended March 312024202320242023
CMS Energy, including Consumers
Net periodic credit
Service cost$7 $7 $3 $3 
Interest cost26 27 11 11 
Expected return on plan assets(59)(55)(29)(26)
Amortization of:
Net loss3 3 1 3 
Prior service cost (credit)1 1 (8)(10)
Settlement loss3 2 — — 
Net periodic credit$(19)$(15)$(22)$(19)
Consumers
Net periodic credit
Service cost$7 $7 $3 $3 
Interest cost24 25 10 11 
Expected return on plan assets(55)(52)(27)(24)
Amortization of:
Net loss3 3 1 3 
Prior service cost (credit)1 1 (7)(10)
Settlement loss3 2 — — 
Net periodic credit$(17)$(14)$(20)$(17)