Segment Information (Tables)

9 Months Ended

Sep. 30, 2013

Segment Reporting [Abstract]

Reconciliation of Revenue from Segments to Consolidated [Table Text Block]

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:

	Three Months Ended						Nine Months Ended
	September 30,						September 30,
	2013			2012			2013			2012
	(In millions)
Inter-segment Revenues
Electric	$	6		$	7		$	19		$	22
Gas	2			1			4			3
Gas Storage and Pipelines	(2		)	1			2			5
Power and Industrial Projects	231			225			621			608
Energy Trading	13			10			36			34
Corporate and Other	(8		)	(11		)	(23		)	(28		)
Discontinued Operations	—			1			—			1
	$	242		$	234		$	659		$	645

Financial data of the business segments follows:

	Three Months Ended						Nine Months Ended
	September 30,						September 30,
	2013			2012			2013			2012
	(In millions)
Operating Revenues
Electric	$	1,458		$	1,543		$	3,942		$	4,031
Gas	161			160			1,013			883
Gas Storage and Pipelines	34			21			92			73
Power and Industrial Projects	512			477			1,431			1,375
Energy Trading	463			223			1,307			723
Corporate & Other	1			—			2			2
Reconciliation & Eliminations	(242		)	(234		)	(659		)	(645		)
Total	$	2,387		$	2,190		$	7,128		$	6,442

Reconciliation of Operating Profit (Loss) from Segments to Consolidated [Table Text Block]

Net Income (Loss) Attributable to DTE Energy by Segment:
Electric	$	179		$	194		$	383		$	417
Gas	(13		)	4			91			60
Gas Storage and Pipelines	16			14			49			48
Power and Industrial Projects	27			22			46			40
Energy Trading	(6		)	1			(1		)	3
Corporate & Other	(5		)	(9		)	(31		)	(39		)
Discontinued operations	—			1			—			—
Net Income Attributable to DTE Energy	$	198		$	227		$	537		$	529