Stock-Based Compensation (Tables)

12 Months Ended

Dec. 31, 2015

Share-based Compensation [Abstract]

Schedule of Employee Service Stock-based Compensation, Allocation of Recognized Period Costs

The following table summarizes the components of stock-based compensation for DTE Energy:

	2015		2014		2013
	(In millions)
Stock-based compensation expense	$	34	$	103	$	99
Tax benefit	$	13	$	40	$	38
Stock-based compensation cost capitalized in Property, plant, and equipment	$	5	$	16	$	15

Schedule of Stock-based Compensation, Stock Options, Activity

The following table summarizes DTE Energy's stock option activity for the year ended December 31, 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 December 31, 2015	262,282		$	42.52	$	10

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, 2015 were as follows:

Range of Exercise Prices					Number of Options	Weighted Average Exercise Price		Weighted Average Remaining Contractual Life (Years)
$	27.00	—	$	38.00	22,083	$	27.70	3.16
$	38.01	—	$	42.00	80,434	$	41.79	2.16
$	42.01	—	$	45.00	116,665	$	43.90	3.79
$	45.01	—	$	50.00	43,100	$	47.75	1.15
					262,282	$	42.52	2.80

Schedule of Stock-based Compensation, Restricted Stock Units Award Activity

Stock award activity for DTE Energy for the years ended December 31 was:

	2015		2014		2013
Fair value of awards vested (in millions)	$	9	$	11	$	8
Restricted common shares awarded	144,300		159,590		127,785
Weighted average market price of shares awarded	$	83.43	$	70.09	$	64.72
Compensation cost charged against income (in millions)	$	10	$	10	$	23

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, 2015:

	Restricted Stock		Weighted Average Grant Date Fair Value
Balance at December 31, 2014	416,318		$	62.82
Grants	144,300		$	83.43
Forfeitures	(12,721	)	$	74.78
Vested and issued	(165,453	)	$	55.73
Balance at December 31, 2015	382,444		$	73.26

Stock-based Compensation Expense

DTE Energy recorded compensation expense for performance share awards as follows:

	2015		2014		2013
	(In millions)
Compensation expense	$	24	$	93	$	77
Cash settlements (a)	$	13	$	11	$	9
Stock settlements (a)	$	71	$	61	$	56

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(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, 2015:

	Performance Shares		Weighted Average Grant Date Fair Value
Balance at December 31, 2014	1,554,697		$	69.32
Grants	467,288		$	83.85
Forfeitures	(47,067	)	$	76.22
Payouts	(532,700	)	$	—
Balance at December 31, 2015	1,442,218		$	75.85

Schedule of Unrecognized Compensation Cost, Nonvested Awards

As of December 31, 2015, 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	$	11	1.11
Performance shares	37		0.97
	$	48	1.00