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Stock-Based Compensation (Tables)
 9 Months Ended
Sep. 30, 2015
Share-based Compensation [Abstract]  
Schedule of Stock-based Compensation
The following table summarizes the components of stock-based compensation for DTE Energy:
 
Three Months Ended September 30,
 
Nine Months Ended September 30,
 
2015
 
2014
 
2015
 
2014
 
(In millions)
Stock-based compensation expense
$
12

 
$
22

 
$
32

 
$
72

Tax benefit
$
5

 
$
8

 
$
13

 
$
27

Stock-based compensation cost capitalized in Property, plant, and equipment
$
2

 
$
4

 
$
5

 
$
11
Schedule of Stock Option Activity
The following table summarizes DTE Energy's stock option activity for the nine months ended September 30, 2015:
 
Number of
Options
 
Weighted
Average
Exercise Price
 
Aggregate Intrinsic Value
(In millions)
Options outstanding at December 31, 2014
444,278

 
$
43.56

 
 
Exercised
(178,017
)
 
$
45.07

 
 
Forfeited or expired
(3,979
)
 
$
44.72

 
 
Options outstanding and exercisable at September 30, 2015
262,282

 
$
42.52

 
$
9
Schedule of Restricted Stock Activity
The following table summarizes DTE Energy’s restricted stock awards activity for the nine months ended September 30, 2015:
 
Restricted
Stock
 
Weighted Average Grant Date Fair Value
Balance at December 31, 2014
416,318

 
$
62.82

Grants
143,800

 
$
83.44

Forfeitures
(8,975
)
 
$
73.62

Vested and issued
(158,920
)
 
$
55.36

Balance at September 30, 2015
392,223

 
$
73.15
Schedule of Performance Share Activity
The following table summarizes DTE Energy’s performance share activity for the nine months ended September 30, 2015:
 
Performance
Shares
 
Weighted Average Grant Date Fair Value
Balance at December 31, 2014
1,554,697

 
$
69.32

Grants
454,654

 
$
83.86

Forfeitures
(37,112
)
 
$
75.90

Payouts
(532,700
)
 
$
—

Balance at September 30, 2015
1,439,539

 
$
75.80