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Retirement Benefits
 6 Months Ended
Jun. 30, 2018
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.
In November 2017, CMS Energy and Consumers approved certain amendments to the OPEB Plan, resulting in higher OPEB Plan credits in 2018 compared to 2017. 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
2018
 
2017
 
 
2018
 
2017
 
 
2018
 
2017
 
 
2018
 
2017
 
CMS Energy, including Consumers
Net periodic cost (credit)
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Service cost
 
$
12

 
$
11

 
 
$
24

 
$
22

 
 
$
5

 
$
5

 
 
$
9

 
$
10

Interest cost
 
23

 
22

 
 
45

 
44

 
 
9

 
13

 
 
18

 
26

Expected return on plan assets
 
(37
)
 
(38
)
 
 
(74
)
 
(76
)
 
 
(25
)
 
(23
)
 
 
(49
)
 
(45
)
Amortization of:
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Net loss
 
19

 
20

 
 
37

 
40

 
 
4

 
8

 
 
8

 
16

Prior service cost (credit)
 
—

 
1

 
 
1

 
2

 
 
(17
)
 
(9
)
 
 
(34
)
 
(18
)
Net periodic cost (credit)
 
$
17

 
$
16

 
 
$
33

 
$
32

 
 
$
(24
)
 
$
(6
)
 
 
$
(48
)
 
$
(11
)
Consumers
Net periodic cost (credit)
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Service cost
 
$
11

 
$
11

 
 
$
23

 
$
22

 
 
$
4

 
$
4

 
 
$
8

 
$
9

Interest cost
 
21

 
22

 
 
42

 
43

 
 
9

 
13

 
 
17

 
26

Expected return on plan assets
 
(34
)
 
(37
)
 
 
(69
)
 
(74
)
 
 
(23
)
 
(21
)
 
 
(46
)
 
(42
)
Amortization of:
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Net loss
 
18

 
19

 
 
36

 
39

 
 
4

 
8

 
 
8

 
16

Prior service cost (credit)
 
—

 
1

 
 
1

 
2

 
 
(16
)
 
(8
)
 
 
(32
)
 
(17
)
Net periodic cost (credit)
 
$
16

 
$
16

 
 
$
33

 
$
32

 
 
$
(22
)
 
$
(4
)
 
 
$
(45
)
 
$
(8
)
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.
In November 2017, CMS Energy and Consumers approved certain amendments to the OPEB Plan, resulting in higher OPEB Plan credits in 2018 compared to 2017. 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
2018
 
2017
 
 
2018
 
2017
 
 
2018
 
2017
 
 
2018
 
2017
 
CMS Energy, including Consumers
Net periodic cost (credit)
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Service cost
 
$
12

 
$
11

 
 
$
24

 
$
22

 
 
$
5

 
$
5

 
 
$
9

 
$
10

Interest cost
 
23

 
22

 
 
45

 
44

 
 
9

 
13

 
 
18

 
26

Expected return on plan assets
 
(37
)
 
(38
)
 
 
(74
)
 
(76
)
 
 
(25
)
 
(23
)
 
 
(49
)
 
(45
)
Amortization of:
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Net loss
 
19

 
20

 
 
37

 
40

 
 
4

 
8

 
 
8

 
16

Prior service cost (credit)
 
—

 
1

 
 
1

 
2

 
 
(17
)
 
(9
)
 
 
(34
)
 
(18
)
Net periodic cost (credit)
 
$
17

 
$
16

 
 
$
33

 
$
32

 
 
$
(24
)
 
$
(6
)
 
 
$
(48
)
 
$
(11
)
Consumers
Net periodic cost (credit)
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Service cost
 
$
11

 
$
11

 
 
$
23

 
$
22

 
 
$
4

 
$
4

 
 
$
8

 
$
9

Interest cost
 
21

 
22

 
 
42

 
43

 
 
9

 
13

 
 
17

 
26

Expected return on plan assets
 
(34
)
 
(37
)
 
 
(69
)
 
(74
)
 
 
(23
)
 
(21
)
 
 
(46
)
 
(42
)
Amortization of:
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Net loss
 
18

 
19

 
 
36

 
39

 
 
4

 
8

 
 
8

 
16

Prior service cost (credit)
 
—

 
1

 
 
1

 
2

 
 
(16
)
 
(8
)
 
 
(32
)
 
(17
)
Net periodic cost (credit)
 
$
16

 
$
16

 
 
$
33

 
$
32

 
 
$
(22
)
 
$
(4
)
 
 
$
(45
)
 
$
(8
)