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Retirement Benefits
 9 Months Ended
Sep. 30, 2025
Defined Benefit Plan Disclosure [Line Items]  
Retirement Benefits Retirement Benefits
CMS Energy and Consumers provide pension, OPEB, and other retirement benefits to eligible 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 3020252024202520242025202420252024
CMS Energy, including Consumers
Net periodic credit
Service cost$6 $7 $19 $21 $2 $2 $6 $8 
Interest cost27 26 81 78 10 10 32 32 
Expected return on plan assets(57)(58)(171)(176)(27)(28)(83)(86)
Amortization of:
Net loss3 3 8 9 — 1 2 3 
Prior service cost (credit)1 1 3 3 (8)(7)(25)(23)
Settlement loss3 3 8 8 — — — — 
Net periodic credit$(17)$(18)$(52)$(57)$(23)$(22)$(68)$(66)
Consumers
Net periodic credit
Service cost$6 $7 $18 $20 $2 $2 $6 $8 
Interest cost26 25 77 74 11 11 32 31 
Expected return on plan assets(54)(56)(162)(166)(26)(26)(78)(80)
Amortization of:
Net loss2 3 7 8 — 1 2 3 
Prior service cost (credit)1 1 3 3 (8)(8)(25)(23)
Settlement loss3 3 8 8 — — — — 
Net periodic credit$(16)$(17)$(49)$(53)$(21)$(20)$(63)$(61)
In Consumers’ electric and gas rate cases, the MPSC approved a mechanism allowing Consumers to defer for future recovery or refund pension and OPEB expenses above or below the amounts used to set existing rates. Amounts deferred will be collected from or refunded to customers over ten years. At September 30, 2025, CMS Energy, including Consumers, had deferred $1 million of pension costs and
$7 million of OPEB credits under this mechanism related to 2025 expense. 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 eligible 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 3020252024202520242025202420252024
CMS Energy, including Consumers
Net periodic credit
Service cost$6 $7 $19 $21 $2 $2 $6 $8 
Interest cost27 26 81 78 10 10 32 32 
Expected return on plan assets(57)(58)(171)(176)(27)(28)(83)(86)
Amortization of:
Net loss3 3 8 9 — 1 2 3 
Prior service cost (credit)1 1 3 3 (8)(7)(25)(23)
Settlement loss3 3 8 8 — — — — 
Net periodic credit$(17)$(18)$(52)$(57)$(23)$(22)$(68)$(66)
Consumers
Net periodic credit
Service cost$6 $7 $18 $20 $2 $2 $6 $8 
Interest cost26 25 77 74 11 11 32 31 
Expected return on plan assets(54)(56)(162)(166)(26)(26)(78)(80)
Amortization of:
Net loss2 3 7 8 — 1 2 3 
Prior service cost (credit)1 1 3 3 (8)(8)(25)(23)
Settlement loss3 3 8 8 — — — — 
Net periodic credit$(16)$(17)$(49)$(53)$(21)$(20)$(63)$(61)
In Consumers’ electric and gas rate cases, the MPSC approved a mechanism allowing Consumers to defer for future recovery or refund pension and OPEB expenses above or below the amounts used to set existing rates. Amounts deferred will be collected from or refunded to customers over ten years. At September 30, 2025, CMS Energy, including Consumers, had deferred $1 million of pension costs and
$7 million of OPEB credits under this mechanism related to 2025 expense. 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.