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Retirement Benefits
 6 Months Ended
Jun. 30, 2020
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
2020
 
2019
 
 
2020
 
2019
 
 
2020
 
2019
 
 
2020
 
2019
 
CMS Energy, including Consumers
Net periodic cost (credit)
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Service cost
 
$
13

 
$
10

 
 
$
25

 
$
20

 
 
$
4

 
$
3

 
 
$
8

 
$
7

Interest cost
 
20

 
24

 
 
41

 
49

 
 
9

 
10

 
 
17

 
20

Expected return on plan assets
 
(48
)
 
(41
)
 
 
(96
)
 
(81
)
 
 
(25
)
 
(22
)
 
 
(50
)
 
(44
)
Amortization of:
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Net loss
 
22

 
12

 
 
44

 
24

 
 
3

 
6

 
 
7

 
13

Prior service cost (credit)
 
1

 
1

 
 
1

 
1

 
 
(14
)
 
(15
)
 
 
(28
)
 
(31
)
Net periodic cost (credit)
 
$
8

 
$
6

 
 
$
15

 
$
13

 
 
$
(23
)
 
$
(18
)
 
 
$
(46
)
 
$
(35
)
Consumers
Net periodic cost (credit)
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Service cost
 
$
12

 
$
10

 
 
$
24

 
$
20

 
 
$
4

 
$
4

 
 
$
8

 
$
7

Interest cost
 
19

 
23

 
 
39

 
46

 
 
8

 
10

 
 
16

 
20

Expected return on plan assets
 
(46
)
 
(38
)
 
 
(91
)
 
(76
)
 
 
(24
)
 
(20
)
 
 
(47
)
 
(41
)
Amortization of:
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Net loss
 
21

 
11

 
 
42

 
23

 
 
3

 
6

 
 
7

 
13

Prior service cost (credit)
 
1

 
1

 
 
1

 
1

 
 
(13
)
 
(16
)
 
 
(27
)
 
(31
)
Net periodic cost (credit)
 
$
7

 
$
7

 
 
$
15

 
$
14

 
 
$
(22
)
 
$
(16
)
 
 
$
(43
)
 
$
(32
)
Contributions: In January 2020, CMS Energy, including Consumers, contributed $531 million and Consumers contributed $518 million to the DB Pension Plans.
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
2020
 
2019
 
 
2020
 
2019
 
 
2020
 
2019
 
 
2020
 
2019
 
CMS Energy, including Consumers
Net periodic cost (credit)
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Service cost
 
$
13

 
$
10

 
 
$
25

 
$
20

 
 
$
4

 
$
3

 
 
$
8

 
$
7

Interest cost
 
20

 
24

 
 
41

 
49

 
 
9

 
10

 
 
17

 
20

Expected return on plan assets
 
(48
)
 
(41
)
 
 
(96
)
 
(81
)
 
 
(25
)
 
(22
)
 
 
(50
)
 
(44
)
Amortization of:
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Net loss
 
22

 
12

 
 
44

 
24

 
 
3

 
6

 
 
7

 
13

Prior service cost (credit)
 
1

 
1

 
 
1

 
1

 
 
(14
)
 
(15
)
 
 
(28
)
 
(31
)
Net periodic cost (credit)
 
$
8

 
$
6

 
 
$
15

 
$
13

 
 
$
(23
)
 
$
(18
)
 
 
$
(46
)
 
$
(35
)
Consumers
Net periodic cost (credit)
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Service cost
 
$
12

 
$
10

 
 
$
24

 
$
20

 
 
$
4

 
$
4

 
 
$
8

 
$
7

Interest cost
 
19

 
23

 
 
39

 
46

 
 
8

 
10

 
 
16

 
20

Expected return on plan assets
 
(46
)
 
(38
)
 
 
(91
)
 
(76
)
 
 
(24
)
 
(20
)
 
 
(47
)
 
(41
)
Amortization of:
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Net loss
 
21

 
11

 
 
42

 
23

 
 
3

 
6

 
 
7

 
13

Prior service cost (credit)
 
1

 
1

 
 
1

 
1

 
 
(13
)
 
(16
)
 
 
(27
)
 
(31
)
Net periodic cost (credit)
 
$
7

 
$
7

 
 
$
15

 
$
14

 
 
$
(22
)
 
$
(16
)
 
 
$
(43
)
 
$
(32
)
Contributions: In January 2020, CMS Energy, including Consumers, contributed $531 million and Consumers contributed $518 million to the DB Pension Plans.