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Retirement Benefits
6 Months Ended
Jun. 30, 2019
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.
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 benefits plans:
In Millions
 
 
DB Pension Plans
 
OPEB Plan
 
Three Months Ended
 
Six Months Ended
 
Three Months Ended
 
Six Months Ended
June 30
2019
 
2018
 
 
2019
 
2018
 
 
2019
 
2018
 
 
2019
 
2018
 
CMS Energy, including Consumers
Net periodic cost (credit)
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Service cost
 
$
10

 
$
12

 
 
$
20

 
$
24

 
 
$
3

 
$
5

 
 
$
7

 
$
9

Interest cost
 
24

 
23

 
 
49

 
45

 
 
10

 
9

 
 
20

 
18

Expected return on plan assets
 
(41
)
 
(37
)
 
 
(81
)
 
(74
)
 
 
(22
)
 
(25
)
 
 
(44
)
 
(49
)
Amortization of:
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Net loss
 
12

 
19

 
 
24

 
37

 
 
6

 
4

 
 
13

 
8

Prior service cost (credit)
 
1

 

 
 
1

 
1

 
 
(15
)
 
(17
)
 
 
(31
)
 
(34
)
Net periodic cost (credit)
 
$
6

 
$
17

 
 
$
13

 
$
33

 
 
$
(18
)
 
$
(24
)
 
 
$
(35
)
 
$
(48
)
Consumers
Net periodic cost (credit)
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Service cost
 
$
10

 
$
11

 
 
$
20

 
$
23

 
 
$
4

 
$
4

 
 
$
7

 
$
8

Interest cost
 
23

 
21

 
 
46

 
42

 
 
10

 
9

 
 
20

 
17

Expected return on plan assets
 
(38
)
 
(34
)
 
 
(76
)
 
(69
)
 
 
(20
)
 
(23
)
 
 
(41
)
 
(46
)
Amortization of:
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Net loss
 
11

 
18

 
 
23

 
36

 
 
6

 
4

 
 
13

 
8

Prior service cost (credit)
 
1

 

 
 
1

 
1

 
 
(16
)
 
(16
)
 
 
(31
)
 
(32
)
Net periodic cost (credit)
 
$
7

 
$
16

 
 
$
14

 
$
33

 
 
$
(16
)
 
$
(22
)
 
 
$
(32
)
 
$
(45
)

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.
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 benefits plans:
In Millions
 
 
DB Pension Plans
 
OPEB Plan
 
Three Months Ended
 
Six Months Ended
 
Three Months Ended
 
Six Months Ended
June 30
2019
 
2018
 
 
2019
 
2018
 
 
2019
 
2018
 
 
2019
 
2018
 
CMS Energy, including Consumers
Net periodic cost (credit)
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Service cost
 
$
10

 
$
12

 
 
$
20

 
$
24

 
 
$
3

 
$
5

 
 
$
7

 
$
9

Interest cost
 
24

 
23

 
 
49

 
45

 
 
10

 
9

 
 
20

 
18

Expected return on plan assets
 
(41
)
 
(37
)
 
 
(81
)
 
(74
)
 
 
(22
)
 
(25
)
 
 
(44
)
 
(49
)
Amortization of:
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Net loss
 
12

 
19

 
 
24

 
37

 
 
6

 
4

 
 
13

 
8

Prior service cost (credit)
 
1

 

 
 
1

 
1

 
 
(15
)
 
(17
)
 
 
(31
)
 
(34
)
Net periodic cost (credit)
 
$
6

 
$
17

 
 
$
13

 
$
33

 
 
$
(18
)
 
$
(24
)
 
 
$
(35
)
 
$
(48
)
Consumers
Net periodic cost (credit)
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Service cost
 
$
10

 
$
11

 
 
$
20

 
$
23

 
 
$
4

 
$
4

 
 
$
7

 
$
8

Interest cost
 
23

 
21

 
 
46

 
42

 
 
10

 
9

 
 
20

 
17

Expected return on plan assets
 
(38
)
 
(34
)
 
 
(76
)
 
(69
)
 
 
(20
)
 
(23
)
 
 
(41
)
 
(46
)
Amortization of:
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Net loss
 
11

 
18

 
 
23

 
36

 
 
6

 
4

 
 
13

 
8

Prior service cost (credit)
 
1

 

 
 
1

 
1

 
 
(16
)
 
(16
)
 
 
(31
)
 
(32
)
Net periodic cost (credit)
 
$
7

 
$
16

 
 
$
14

 
$
33

 
 
$
(16
)
 
$
(22
)
 
 
$
(32
)
 
$
(45
)