v3.25.2
Retirement Benefits (Tables)
 6 Months Ended
Jun. 30, 2025
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 EndedSix Months EndedThree Months EndedSix Months Ended
June 3020252024202520242025202420252024
CMS Energy, including Consumers
Net periodic credit
Service cost$7 $7 $13 $14 $2 $3 $4 $6 
Interest cost27 26 54 52 11 11 22 22 
Expected return on plan assets(57)(59)(114)(118)(28)(29)(56)(58)
Amortization of:
Net loss2 3 5 6 1 1 2 2 
Prior service cost (credit)1 1 2 2 (8)(8)(17)(16)
Settlement loss2 2 5 5 — — — — 
Net periodic credit$(18)$(20)$(35)$(39)$(22)$(22)$(45)$(44)
Consumers
Net periodic credit
Service cost$6 $6 $12 $13 $2 $3 $4 $6 
Interest cost25 25 51 49 11 10 21 20 
Expected return on plan assets(54)(55)(108)(110)(26)(27)(52)(54)
Amortization of:
Net loss3 2 5 5 1 1 2 2 
Prior service cost (credit)1 1 2 2 (9)(8)(17)(15)
Settlement loss2 2 5 5 — — — — 
Net periodic credit$(17)$(19)$(33)$(36)$(21)$(21)$(42)$(41)
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 EndedSix Months EndedThree Months EndedSix Months Ended
June 3020252024202520242025202420252024
CMS Energy, including Consumers
Net periodic credit
Service cost$7 $7 $13 $14 $2 $3 $4 $6 
Interest cost27 26 54 52 11 11 22 22 
Expected return on plan assets(57)(59)(114)(118)(28)(29)(56)(58)
Amortization of:
Net loss2 3 5 6 1 1 2 2 
Prior service cost (credit)1 1 2 2 (8)(8)(17)(16)
Settlement loss2 2 5 5 — — — — 
Net periodic credit$(18)$(20)$(35)$(39)$(22)$(22)$(45)$(44)
Consumers
Net periodic credit
Service cost$6 $6 $12 $13 $2 $3 $4 $6 
Interest cost25 25 51 49 11 10 21 20 
Expected return on plan assets(54)(55)(108)(110)(26)(27)(52)(54)
Amortization of:
Net loss3 2 5 5 1 1 2 2 
Prior service cost (credit)1 1 2 2 (9)(8)(17)(15)
Settlement loss2 2 5 5 — — — — 
Net periodic credit$(17)$(19)$(33)$(36)$(21)$(21)$(42)$(41)