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Retirement Benefits
 9 Months Ended
Sep. 30, 2024
Defined Benefit Plan Disclosure [Line Items]  
Retirement Benefits Retirement Benefits
CMS Energy and Consumers provide pension, OPEB, and other retirement benefits to employees under a number of different plans.
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 EndedNine Months EndedThree Months EndedNine Months Ended
September 3020242023202420232024202320242023
CMS Energy, including Consumers
Net periodic credit
Service cost$7 $7 $21 $22 $2 $2 $8 $8 
Interest cost26 27 78 80 10 11 32 33 
Expected return on plan assets(58)(55)(176)(165)(28)(26)(86)(77)
Amortization of:
Net loss3 2 9 8 1 3 3 9 
Prior service cost (credit)1 1 3 3 (7)(10)(23)(31)
Settlement loss3 3 8 8 — — — — 
Net periodic credit$(18)$(15)$(57)$(44)$(22)$(20)$(66)$(58)
Consumers
Net periodic credit
Service cost$7 $7 $20 $21 $2 $2 $8 $8 
Interest cost25 24 74 75 11 10 31 31 
Expected return on plan assets(56)(52)(166)(156)(26)(23)(80)(71)
Amortization of:
Net loss3 3 8 8 1 3 3 9 
Prior service cost (credit)1 1 3 3 (8)(10)(23)(30)
Settlement loss3 3 8 8 — — — — 
Net periodic credit$(17)$(14)$(53)$(41)$(20)$(18)$(61)$(53)
In Consumers’ electric and gas rate cases, the MPSC approved a mechanism allowing Consumers to defer the future recovery or refund of pension and OPEB expenses above or below the amounts used to set existing rates. The regulatory deferral will be collected from or refunded to customers over ten years. At
September 30, 2024, CMS Energy, including Consumers, had deferred $12 million of pension credits and $8 million of OPEB credits under this mechanism related to 2024 expense.
Consumers Energy Company  
Defined Benefit Plan Disclosure [Line Items]  
Retirement Benefits Retirement Benefits
CMS Energy and Consumers provide pension, OPEB, and other retirement benefits to employees under a number of different plans.
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 EndedNine Months EndedThree Months EndedNine Months Ended
September 3020242023202420232024202320242023
CMS Energy, including Consumers
Net periodic credit
Service cost$7 $7 $21 $22 $2 $2 $8 $8 
Interest cost26 27 78 80 10 11 32 33 
Expected return on plan assets(58)(55)(176)(165)(28)(26)(86)(77)
Amortization of:
Net loss3 2 9 8 1 3 3 9 
Prior service cost (credit)1 1 3 3 (7)(10)(23)(31)
Settlement loss3 3 8 8 — — — — 
Net periodic credit$(18)$(15)$(57)$(44)$(22)$(20)$(66)$(58)
Consumers
Net periodic credit
Service cost$7 $7 $20 $21 $2 $2 $8 $8 
Interest cost25 24 74 75 11 10 31 31 
Expected return on plan assets(56)(52)(166)(156)(26)(23)(80)(71)
Amortization of:
Net loss3 3 8 8 1 3 3 9 
Prior service cost (credit)1 1 3 3 (8)(10)(23)(30)
Settlement loss3 3 8 8 — — — — 
Net periodic credit$(17)$(14)$(53)$(41)$(20)$(18)$(61)$(53)
In Consumers’ electric and gas rate cases, the MPSC approved a mechanism allowing Consumers to defer the future recovery or refund of pension and OPEB expenses above or below the amounts used to set existing rates. The regulatory deferral will be collected from or refunded to customers over ten years. At
September 30, 2024, CMS Energy, including Consumers, had deferred $12 million of pension credits and $8 million of OPEB credits under this mechanism related to 2024 expense.