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Stock-Based Compensation
 6 Months Ended
Jun. 30, 2015
Share-based Compensation [Abstract]  
Stock-based Compensation
STOCK-BASED COMPENSATION
The following table summarizes the components of stock-based compensation for DTE Energy:
 
Three Months Ended June 30,
 
Six Months Ended June 30,
 
2015
 
2014
 
2015
 
2014
 
(In millions)
Stock-based compensation expense
$
13

 
$
16

 
$
20

 
$
50

Tax benefit
$
5

 
$
6

 
$
8

 
$
19

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

 
$
2

 
$
3

 
$
7

Stock Options
The following table summarizes DTE Energy's stock option activity for the six months ended June 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
(166,017
)
 
$
45.19

 
 
Forfeited or expired
(3,979
)
 
$
44.72

 
 
Options outstanding and exercisable at June 30, 2015
274,282

 
$
42.56

 
$
10


As of June 30, 2015, the weighted average remaining contractual life for the exercisable shares is 3.19 years. As of June 30, 2015, all options were vested.
The intrinsic value of options exercised for the six months ended June 30, 2015 and 2014 was $7 million and $6 million, respectively. No option expense was recognized for the six months ended June 30, 2015 and 2014, respectively.
Restricted Stock Awards
The following table summarizes DTE Energy’s restricted stock awards activity for the six months ended June 30, 2015:
 
Restricted
Stock
 
Weighted Average Grant Date Fair Value
Balance at December 31, 2014
416,318

 
$
62.82

Grants
139,800

 
$
83.56

Forfeitures
(7,008
)
 
$
74.14

Vested and issued
(151,788
)
 
$
54.56

Balance at June 30, 2015
397,322

 
$
73.07


Performance Share Awards
Performance shares awarded under the plan are for a specified number of shares of DTE Energy common stock that entitle the holder to receive a cash payment, shares of DTE Energy common stock or a combination thereof. The final value of the award is determined by the achievement of certain performance objectives and market conditions. The awards vest at the end of a specified period, usually three years. Awards granted in 2014 and 2015 were primarily deemed to be equity awards. The DTE Energy stock price and number of probable shares attributable to market conditions for such equity awards are fair valued only at the grant date. Performance shares awarded prior to 2014 are liability awards and are remeasured to fair value at each reporting period.
The following table summarizes DTE Energy’s performance share activity for the six months ended June 30, 2015:
 
Performance
Shares
 
Weighted Average Grant Date Fair Value
Balance at December 31, 2014
1,554,697

 
$
69.32

Grants
442,096

 
$
83.99

Forfeitures
(26,112
)
 
$
75.99

Payouts
(532,700
)
 
$
—

Balance at June 30, 2015
1,437,981

 
$
75.78


Unrecognized Compensation Costs
As of June 30, 2015, DTE Energy had $72 million of total unrecognized compensation cost related to non-vested stock incentive plan arrangements. That cost is expected to be recognized over a weighted-average period of 1.49 years.
Allocated Stock-Based Compensation
DTE Electric received an allocation of costs from DTE Energy associated with stock-based compensation of $8 million and $10 million for the three months ended June 30, 2015 and 2014, respectively while such allocation was $12 million and $29 million for the six months ended June 30, 2015 and 2014, respectively.