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Retirement Benefits
 6 Months Ended
Jun. 30, 2023
Defined Benefit Plan Disclosure [Line Items]  
Retirement Benefits Retirement BenefitsCMS 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 EndedSix Months EndedThree Months EndedSix Months Ended
June 3020232022202320222023202220232022
CMS Energy, including Consumers
Net periodic credit
Service cost$8 $11 $15 $23 $3 $5 $6 $9 
Interest cost26 20 53 38 11 7 22 14 
Expected return on plan assets(55)(52)(110)(104)(25)(29)(51)(58)
Amortization of:
Net loss3 10 6 27 3 1 6 1 
Prior service cost (credit)1 1 2 2 (11)(14)(21)(26)
Settlement loss3 2 5 4 — — — — 
Net periodic credit$(14)$(8)$(29)$(10)$(19)$(30)$(38)$(60)
Consumers
Net periodic credit
Service cost$7 $11 $14 $23 $3 $5 $6 $9 
Interest cost26 20 51 36 10 7 21 14 
Expected return on plan assets(52)(50)(104)(99)(24)(27)(48)(54)
Amortization of:
Net loss2 9 5 25 3 — 6 — 
Prior service cost (credit)1 1 2 2 (10)(13)(20)(25)
Settlement loss3 2 5 4 — — — — 
Net periodic credit$(13)$(7)$(27)$(9)$(18)$(28)$(35)$(56)
In Consumers’ 2022 electric rate case, 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, respectively, beginning in 2023. At June 30, 2023, CMS Energy, including Consumers, had deferred $6 million of pension credits and $12 million of OPEB costs under this mechanism.
Consumers Energy Company  
Defined Benefit Plan Disclosure [Line Items]  
Retirement Benefits Retirement BenefitsCMS 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 EndedSix Months EndedThree Months EndedSix Months Ended
June 3020232022202320222023202220232022
CMS Energy, including Consumers
Net periodic credit
Service cost$8 $11 $15 $23 $3 $5 $6 $9 
Interest cost26 20 53 38 11 7 22 14 
Expected return on plan assets(55)(52)(110)(104)(25)(29)(51)(58)
Amortization of:
Net loss3 10 6 27 3 1 6 1 
Prior service cost (credit)1 1 2 2 (11)(14)(21)(26)
Settlement loss3 2 5 4 — — — — 
Net periodic credit$(14)$(8)$(29)$(10)$(19)$(30)$(38)$(60)
Consumers
Net periodic credit
Service cost$7 $11 $14 $23 $3 $5 $6 $9 
Interest cost26 20 51 36 10 7 21 14 
Expected return on plan assets(52)(50)(104)(99)(24)(27)(48)(54)
Amortization of:
Net loss2 9 5 25 3 — 6 — 
Prior service cost (credit)1 1 2 2 (10)(13)(20)(25)
Settlement loss3 2 5 4 — — — — 
Net periodic credit$(13)$(7)$(27)$(9)$(18)$(28)$(35)$(56)
In Consumers’ 2022 electric rate case, 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, respectively, beginning in 2023. At June 30, 2023, CMS Energy, including Consumers, had deferred $6 million of pension credits and $12 million of OPEB costs under this mechanism.