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Stock-Based Compensation (Tables)
 12 Months Ended
Dec. 31, 2018
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Schedule Of Restricted Stock Activity
Presented in the following tables is the activity for restricted stock and restricted stock units under the PISP:
 
CMS Energy, including Consumers
 
Consumers
Year Ended December 31, 2018
 
Number of
Shares

Weighted-Average
Grant Date Fair Value
per Share
 
 
Number of
Shares

Weighted-Average
Grant Date Fair Value
per Share
 
Nonvested at beginning of period
 
1,193,266

 
$
38.48

 
1,145,122

 
$
38.50

Granted
 
 
 
 
 
 
 
 
Restricted stock
 
642,390

 
26.49

 
607,749

 
26.51

Restricted stock units
 
12,450

 
41.77

 
11,934

 
42.01

Vested
 
 
 
 
 
 
 
 
Restricted stock
 
(597,636
)
 
23.08

 
(567,154
)
 
23.15

Restricted stock units
 
(12,686
)
 
40.99

 
(12,260
)
 
40.98

Forfeited – restricted stock
 
(26,555
)
 
39.73

 
(26,555
)
 
39.73

Nonvested at end of period
 
1,211,229

 
$
39.70

 
1,158,836

 
$
39.71

Year Ended December 31, 2018
CMS Energy, including
Consumers

Consumers

Granted
 
 
Time-lapse awards
122,615

117,029

Market-based awards
134,179

126,558

Performance-based awards
134,179

126,558

Restricted stock units
11,196

10,792

Dividend equivalents on market-based awards
21,154

20,077

Dividend equivalents on performance-based awards
25,925

24,583

Dividend equivalents on restricted stock units
1,254

1,142

Additional market-based shares based on achievement of condition
88,987

84,025

Additional performance-based shares based on achievement of condition
115,351

108,919

Total granted
654,840

619,683
Schedule of Share-based Payment Award, Restricted Stock, Valuation Assumptions
Presented in the following table are the most important assumptions used to estimate the fair value of the market-based restricted stock awards:
Years Ended December 31
2018

2017

2016

Expected volatility
16.7
%
18.0
%
16.7
%
Expected dividend yield
2.8

3.0

3.2

Risk-free rate
2.1

1.5

1.0
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Weighted Average Grant Date Fair Value
Presented in the following table is the weighted-average grant-date fair value of all awards under the PISP:
Years Ended December 31
2018
 
2017
 
2016
 
CMS Energy, including Consumers
 
 
 
 
 
 
Weighted-average grant-date fair value per share
 
 
 
 
 
 
Restricted stock granted
 
$
26.49

 
$
28.61

 
$
31.74

Restricted stock units granted
 
41.77

 
41.98

 
39.12

Consumers
 
 
 
 
 
 
Weighted-average grant-date fair value per share
 
 
 
 
 
 
Restricted stock granted
 
$
26.51

 
$
28.67

 
$
31.77

Restricted stock units granted
 
42.01

 
41.97

 
39.12
Schedule of Compensation Cost for Share-based Payment Arrangements, Allocation of Share-based Compensation Costs by Plan
Presented in the following table are amounts related to restricted stock awards and restricted stock units:
In Millions
 
Years Ended December 31
 
2018

 
2017

 
2016

CMS Energy, including Consumers
 
 
 
 
 
 
Fair value of shares that vested during the year
 
$
27

 
$
37

 
$
31

Compensation expense recognized
 
17

 
17

 
16

Income tax benefit recognized
 
1

 
7

 
7

Consumers
 
 
 
 
 
 
Fair value of shares that vested during the year
 
$
26

 
$
35

 
$
30

Compensation expense recognized
 
16

 
16

 
16

Income tax benefit recognized
 
1

 
7

 
6
Consumers Energy Company  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Schedule Of Restricted Stock Activity
Presented in the following tables is the activity for restricted stock and restricted stock units under the PISP:
 
CMS Energy, including Consumers
 
Consumers
Year Ended December 31, 2018
 
Number of
Shares

Weighted-Average
Grant Date Fair Value
per Share
 
 
Number of
Shares

Weighted-Average
Grant Date Fair Value
per Share
 
Nonvested at beginning of period
 
1,193,266

 
$
38.48

 
1,145,122

 
$
38.50

Granted
 
 
 
 
 
 
 
 
Restricted stock
 
642,390

 
26.49

 
607,749

 
26.51

Restricted stock units
 
12,450

 
41.77

 
11,934

 
42.01

Vested
 
 
 
 
 
 
 
 
Restricted stock
 
(597,636
)
 
23.08

 
(567,154
)
 
23.15

Restricted stock units
 
(12,686
)
 
40.99

 
(12,260
)
 
40.98

Forfeited – restricted stock
 
(26,555
)
 
39.73

 
(26,555
)
 
39.73

Nonvested at end of period
 
1,211,229

 
$
39.70

 
1,158,836

 
$
39.71

Year Ended December 31, 2018
CMS Energy, including
Consumers

Consumers

Granted
 
 
Time-lapse awards
122,615

117,029

Market-based awards
134,179

126,558

Performance-based awards
134,179

126,558

Restricted stock units
11,196

10,792

Dividend equivalents on market-based awards
21,154

20,077

Dividend equivalents on performance-based awards
25,925

24,583

Dividend equivalents on restricted stock units
1,254

1,142

Additional market-based shares based on achievement of condition
88,987

84,025

Additional performance-based shares based on achievement of condition
115,351

108,919

Total granted
654,840

619,683
Schedule of Share-based Payment Award, Restricted Stock, Valuation Assumptions
Presented in the following table are the most important assumptions used to estimate the fair value of the market-based restricted stock awards:
Years Ended December 31
2018

2017

2016

Expected volatility
16.7
%
18.0
%
16.7
%
Expected dividend yield
2.8

3.0

3.2

Risk-free rate
2.1

1.5

1.0
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Weighted Average Grant Date Fair Value
Presented in the following table is the weighted-average grant-date fair value of all awards under the PISP:
Years Ended December 31
2018
 
2017
 
2016
 
CMS Energy, including Consumers
 
 
 
 
 
 
Weighted-average grant-date fair value per share
 
 
 
 
 
 
Restricted stock granted
 
$
26.49

 
$
28.61

 
$
31.74

Restricted stock units granted
 
41.77

 
41.98

 
39.12

Consumers
 
 
 
 
 
 
Weighted-average grant-date fair value per share
 
 
 
 
 
 
Restricted stock granted
 
$
26.51

 
$
28.67

 
$
31.77

Restricted stock units granted
 
42.01

 
41.97

 
39.12
Schedule of Compensation Cost for Share-based Payment Arrangements, Allocation of Share-based Compensation Costs by Plan
Presented in the following table are amounts related to restricted stock awards and restricted stock units:
In Millions
 
Years Ended December 31
 
2018

 
2017

 
2016

CMS Energy, including Consumers
 
 
 
 
 
 
Fair value of shares that vested during the year
 
$
27

 
$
37

 
$
31

Compensation expense recognized
 
17

 
17

 
16

Income tax benefit recognized
 
1

 
7

 
7

Consumers
 
 
 
 
 
 
Fair value of shares that vested during the year
 
$
26

 
$
35

 
$
30

Compensation expense recognized
 
16

 
16

 
16

Income tax benefit recognized
 
1

 
7

 
6