Segment Information (Tables)

6 Months Ended

Jun. 30, 2012

Segment Reporting [Abstract]

Inter segment billing for goods and services [Table Text Block]

	Three Months Ended						Six Months Ended
	June 30						June 30
	2012			2011			2012			2011
Electric Utility	$	8		$	9		$	15		$	18
Gas Utility	1			1			2			1
Gas Storage and Pipelines	3			4			4			6
Power and Industrial Projects	192			63			383			89
Energy Trading	10			15			24			37
Corporate and Other	(7		)	(11		)	(17		)	(28		)
	$	207		$	81		$	411		$	123

Schedule of Segment Reporting Information, by Segment [Table Text Block]

Financial data of the business segments follows (in millions):

	Three Months Ended						Six Months Ended
	June 30						June 30
	2012			2011			2012			2011
Operating Revenues
Electric Utility	$	1,290		$	1,240		$	2,488		$	2,433
Gas Utility	214			242			723			931
Gas Storage and Pipelines	27			23			52			48
Unconventional Gas Production	12			10			22			18
Power and Industrial Projects	449			287			898			522
Energy Trading	239			306			500			628
Corporate and Other	1			1			2			2
Reconciliation & Eliminations	(207		)	(81		)	(411		)	(123		)
Total	$	2,025		$	2,028		$	4,274		$	4,459
Net Income (Loss) Attributable to DTE Energy by Segment:
Electric Utility	$	127		$	103		$	223		$	188
Gas Utility	4			(3		)	56			80
Gas Storage and Pipelines	17			14			34			29
Unconventional Gas Production	(2		)	(1		)	(3		)	(3		)
Power and Industrial Projects	10			5			18			15
Energy Trading	4			12			2			14
Corporate and Other (a)	(14		)	72			(28		)	55
Net Income Attributable to DTE Energy	$	146		$	202		$	302		$	378