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Stock-Based Compensation (Tables)
12 Months Ended
Dec. 31, 2017
Share-based Compensation [Abstract]  
Schedule of Components of Stock-Based Compensation
The following table summarizes the components of stock-based compensation for DTE Energy:
 
2017
 
2016
 
2015
 
(In millions)
Stock-based compensation expense
$
58

 
$
61

 
$
34

Tax benefit
$
23

 
$
24

 
$
13

Stock-based compensation cost capitalized in Property, plant, and equipment
$
9

 
$
10

 
$
5

Schedule of Stock-based Compensation, Stock Options, Activity
The following table summarizes DTE Energy's stock option activity for the year ended December 31, 2017:
 
Number of Options
 
Weighted Average Exercise Price
 
Aggregate Intrinsic
Value
(In millions)
Options outstanding and exercisable at December 31, 2016
171,517

 
$
41.59

 
 
Exercised
(65,523
)
 
$
39.37

 
 
Options outstanding and exercisable at December 31, 2017
105,994

 
$
42.95

 
$
7

Schedule of Stock-based Compensation, Shares Authorized Under Stock Option Plans, by Exercise Price Range
The number, weighted average exercise price, and weighted average remaining contractual life of DTE Energy options outstanding as of December 31, 2017 were as follows:
Range of Exercise Prices
 
Number of Options
 
Weighted Average
Exercise Price
 
Weighted Average
Remaining Contractual Life (Years)
$
27.00
 —
 
$
38.00

 
6,194

 
$
27.70

 
1.16
$
38.01
 —
 
$
42.00

 
2,300

 
$
41.79

 
0.15
$
42.01
 —
 
$
45.00

 
97,500

 
$
43.95

 
2.15
 
 
 
 
105,994

 
$
42.95

 
2.05
Schedule of Stock-based Compensation, Stock Award Activity
Stock award activity for DTE Energy for the years ended December 31 was:
 
2017
 
2016
 
2015
Fair value of awards vested (in millions)
$
10

 
$
9

 
$
9

Restricted common shares awarded
136,825

 
145,240

 
144,300

Weighted average market price of shares awarded
$
99.53

 
$
87.28

 
$
83.43

Compensation cost charged against income (in millions)
$
11

 
$
11

 
$
10

Schedule of Stock-based Compensation, Restricted Stock Activity Rollforward
The following table summarizes DTE Energy’s restricted stock awards activity for the year ended December 31, 2017:
 
Restricted
Stock
 
Weighted Average
Grant Date
Fair Value
Balance at December 31, 2016
385,285

 
$
80.10

Grants
136,825

 
$
99.53

Forfeitures
(11,745
)
 
$
90.24

Vested and issued
(144,601
)
 
$
72.08

Balance at December 31, 2017
365,764

 
$
90.26

Stock-based Compensation Expense
DTE Energy recorded compensation expense for performance share awards as follows:
 
2017
 
2016
 
2015
 
(In millions)
Compensation expense
$
47

 
$
50

 
$
24

Cash settlements(a)
$
15

 
$
7

 
$
13

Stock settlements(a)
$
66

 
$
38

 
$
71


_______________________________________
(a)
Sum of cash and stock settlements approximates the intrinsic value of the awards.
Schedule of Stock-based Compensation, Performance Shares Activity Rollforward
The following table summarizes DTE Energy’s performance share activity for the period ended December 31, 2017:
 
Performance Shares
 
Weighted Average
Grant Date
Fair Value
Balance at December 31, 2016
1,392,512

 
$
79.97

Grants
494,688

 
$
98.47

Forfeitures
(49,547
)
 
$
87.12

Payouts
(513,252
)
 
$
70.60

Balance at December 31, 2017
1,324,401

 
$
90.31

Schedule of Unrecognized Compensation Cost, Non-Vested Awards
As of December 31, 2017, DTE Energy's total unrecognized compensation cost related to non-vested stock incentive plan arrangements and the weighted average recognition period was as follows:
 
Unrecognized
Compensation
Cost
 
Weighted Average
to be Recognized
 
(In millions)
 
(In years)
Stock awards
$
13

 
1.12
Performance shares
51

 
1.11
 
$
64

 
1.11