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Stock-Based Compensation (Tables)
 12 Months Ended
Dec. 31, 2019
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, 2019
 
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
 
1,211,229

 
$
39.70

 
1,158,836

 
$
39.71

Granted
 
 
 
 
 
 
 
 
Restricted stock
 
488,594

 
43.57

 
464,485

 
43.57

Restricted stock units
 
14,899

 
50.35

 
14,050

 
51.15

Vested
 
 
 
 
 
 
 
 
Restricted stock
 
(468,308
)
 
31.09

 
(447,214
)
 
31.11

Restricted stock units
 
(12,503
)
 
41.59

 
(11,836
)
 
42.35

Forfeited – restricted stock
 
(46,949
)
 
45.81

 
(40,139
)
 
45.69

Nonvested at end of period
 
1,186,962

 
$
44.56

 
1,138,182

 
$
44.57

Year Ended December 31, 2019
CMS Energy, including Consumers

Consumers

Granted
 
 
Time-lapse awards
119,167

113,627

Market-based awards
144,963

137,636

Performance-based awards
144,963

137,636

Director restricted stock units
13,575

13,005

Dividend equivalents on market-based awards
12,779

12,176

Dividend equivalents on performance-based awards
15,899

15,145

Dividend equivalents on restricted stock units
1,324

1,045

Additional market-based shares based on achievement of condition
15,320

14,550

Additional performance-based shares based on achievement of condition
35,503

33,715

Total granted
503,493

478,535
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
2019

2018

2017

Expected volatility
14.9
%
16.7
%
18.0
%
Expected dividend yield
2.8

2.8

3.0

Risk-free rate
2.5

2.1

1.5
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
2019
 
2018
 
2017
 
CMS Energy, including Consumers
 
 
 
 
 
 
Weighted-average grant-date fair value per share
 
 
 
 
 
 
Restricted stock granted
 
$
43.57

 
$
26.49

 
$
28.61

Restricted stock units granted
 
50.35

 
41.77

 
41.98

Consumers
 
 
 
 
 
 
Weighted-average grant-date fair value per share
 
 
 
 
 
 
Restricted stock granted
 
$
43.57

 
$
26.51

 
$
28.67

Restricted stock units granted
 
51.15

 
42.01

 
41.97
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
 
2019

 
2018

 
2017

CMS Energy, including Consumers
 
 
 
 
 
 
Fair value of shares that vested during the year
 
$
26

 
$
27

 
$
37

Compensation expense recognized
 
22

 
17

 
17

Income tax benefit recognized
 
1

 
1

 
7

Consumers
 
 
 
 
 
 
Fair value of shares that vested during the year
 
$
25

 
$
26

 
$
35

Compensation expense recognized
 
21

 
16

 
16

Income tax benefit recognized
 
1

 
1

 
7
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, 2019
 
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
 
1,211,229

 
$
39.70

 
1,158,836

 
$
39.71

Granted
 
 
 
 
 
 
 
 
Restricted stock
 
488,594

 
43.57

 
464,485

 
43.57

Restricted stock units
 
14,899

 
50.35

 
14,050

 
51.15

Vested
 
 
 
 
 
 
 
 
Restricted stock
 
(468,308
)
 
31.09

 
(447,214
)
 
31.11

Restricted stock units
 
(12,503
)
 
41.59

 
(11,836
)
 
42.35

Forfeited – restricted stock
 
(46,949
)
 
45.81

 
(40,139
)
 
45.69

Nonvested at end of period
 
1,186,962

 
$
44.56

 
1,138,182

 
$
44.57

Year Ended December 31, 2019
CMS Energy, including Consumers

Consumers

Granted
 
 
Time-lapse awards
119,167

113,627

Market-based awards
144,963

137,636

Performance-based awards
144,963

137,636

Director restricted stock units
13,575

13,005

Dividend equivalents on market-based awards
12,779

12,176

Dividend equivalents on performance-based awards
15,899

15,145

Dividend equivalents on restricted stock units
1,324

1,045

Additional market-based shares based on achievement of condition
15,320

14,550

Additional performance-based shares based on achievement of condition
35,503

33,715

Total granted
503,493

478,535
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
2019

2018

2017

Expected volatility
14.9
%
16.7
%
18.0
%
Expected dividend yield
2.8

2.8

3.0

Risk-free rate
2.5

2.1

1.5
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
2019
 
2018
 
2017
 
CMS Energy, including Consumers
 
 
 
 
 
 
Weighted-average grant-date fair value per share
 
 
 
 
 
 
Restricted stock granted
 
$
43.57

 
$
26.49

 
$
28.61

Restricted stock units granted
 
50.35

 
41.77

 
41.98

Consumers
 
 
 
 
 
 
Weighted-average grant-date fair value per share
 
 
 
 
 
 
Restricted stock granted
 
$
43.57

 
$
26.51

 
$
28.67

Restricted stock units granted
 
51.15

 
42.01

 
41.97
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
 
2019

 
2018

 
2017

CMS Energy, including Consumers
 
 
 
 
 
 
Fair value of shares that vested during the year
 
$
26

 
$
27

 
$
37

Compensation expense recognized
 
22

 
17

 
17

Income tax benefit recognized
 
1

 
1

 
7

Consumers
 
 
 
 
 
 
Fair value of shares that vested during the year
 
$
25

 
$
26

 
$
35

Compensation expense recognized
 
21

 
16

 
16

Income tax benefit recognized
 
1

 
1

 
7