Segment and Related Information (Tables)

12 Months Ended

Dec. 31, 2015

Segment Reporting [Abstract]

Schedule of Segment Reporting Information, by Segment

Inter-segment billing for goods and services exchanged between segments is based upon tariffed or market-based prices of the provider and primarily consists of the sale of reduced emissions fuel, power sales, and natural gas sales in the following segments:

	Year Ended December 31,
	2015		2014		2013
	(In millions)
Electric	$	36	$	29	$	26
Gas	3		6		4
Gas Storage and Pipelines	8		9		3
Power and Industrial Projects	785		794		816
Energy Trading	32		33		43
Corporate and Other	4		3		(24		)
	$	868	$	874	$	868

Financial data of DTE Energy's business segments follows:

	Electric		Gas		Gas Storage and Pipelines		Power and Industrial Projects		Energy Trading		Corporate and Other		Reclassifications and Eliminations		Total
	(In millions)
2015
Operating Revenues — Utility operations	$	4,901	1,376		—		—		—		—		(39	)	$	6,238
Operating Revenues — Non-utility operations	$	—	—		243		2,224		2,459		2		(829	)	$	4,099
Depreciation and amortization	$	637	104		30		78		2		1		—		$	852
Interest income	$	—	(7	)	(8	)	(8	)	(2	)	(52	)	64		$	(13	)
Interest expense	$	258	62		24		32		6		132		(64	)	$	450
Equity in earnings of equity method investees	$	2	6		47		8		—		3		—		$	66
Income Tax Expense (Benefit)	$	290	72		70		(140	)	(15	)	(47	)	—		$	230
Net Income (Loss) Attributable to DTE Energy Company	$	542	132		107		16		(22	)	(48	)	—		$	727
Investment in equity method investees	$	10	9		296		183		—		16		—		$	514
Capital expenditures and acquisitions	$	1,785	273		161		36		6		—		—		$	2,261
Goodwill	$	1,208	743		24		26		17		—		—		$	2,018
Total Assets	$	19,539	4,299		1,047		860		590		3,530		(1,128	)	$	28,737

	Electric			Gas		Gas Storage and Pipelines		Power and Industrial Projects		Energy Trading	Corporate and Other		Reclassifications and Eliminations		Total
	(In millions)
2014
Operating Revenues — Utility operations	$	5,283		1,636		—		—		—	—		(35	)	$	6,884
Operating Revenues — Non-utility operations	$	—		—		203		2,289		3,762	2		(839	)	$	5,417
Depreciation and amortization	$	933		99		34		77		1	1		—		$	1,145
Interest income	$	(1	)	(7	)	(6	)	(5	)	—	(48	)	57		$	(10	)
Interest expense	$	250		57		22		28		7	122		(57	)	$	429
Equity in earnings of equity method investees	$	1		7		35		5		—	—		—		$	48
Income Tax Expense (Benefit)	$	296		78		53		(100	)	77	(40	)	—		$	364
Net Income (Loss) Attributable to DTE Energy Company	$	528		140		82		90		122	(57	)	—		$	905
Investment in equity method investees	$	8		10		224		184		—	8		—		$	434
Capital expenditures and acquisitions	$	1,561		224		184		77		3	—		—		$	2,049
Goodwill	$	1,208		743		24		26		17	—		—		$	2,018
Total Assets	$	18,713		4,247		883		998		755	3,209		(906	)	$	27,899

	Electric			Gas		Gas Storage and Pipelines		Power and Industrial Projects		Energy Trading		Corporate and Other		Reclassifications and Eliminations		Total
	(In millions)
2013
Operating Revenues — Utility operations	$	5,199		1,474		—		—		—		—		(30	)	$	6,643
Operating Revenues — Non-utility operations	$	—		—		132		1,950		1,771		3		(838	)	$	3,018
Depreciation and amortization	$	902		95		23		72		1		1		—		$	1,094
Interest income	$	(1	)	(7	)	(7	)	(6	)	—		(51	)	63		$	(9	)
Interest expense	$	268		58		18		27		8		120		(63	)	$	436
Equity in earnings of equity method investees	$	1		6		44		8		—		—		—		$	59
Income Tax Expense (Benefit)	$	252		77		45		(45	)	(38	)	(37	)	—		$	254
Net Income (Loss) Attributable to DTE Energy Company	$	484		143		70		66		(58	)	(44	)	—		$	661
Investment in equity method investees	$	9		10		201		189		—		6		—		$	415
Capital expenditures and acquisitions	$	1,325		209		245		93		3		1		—		$	1,876
Goodwill	$	1,208		743		24		26		17		—		—		$	2,018
Total Assets	$	17,508		3,920		823		1,054		624		2,945		(939	)	$	25,935