Segment Information (Tables)

6 Months Ended

Jun. 30, 2013

Segment Reporting [Abstract]

Inter segment billing for goods and services [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, natural gas sales and coal transportation services in the following segments:

	Three Months Ended						Six Months Ended
	June 30,						June 30,
	2013			2012			2013			2012
	(In millions)
Inter-segment Revenues
Electric	$	7		$	8		$	13		$	15
Gas	1			1			2			2
Gas Storage and Pipelines	2			3			4			4
Power and Industrial Projects	185			192			390			383
Energy Trading	12			10			23			24
Corporate and Other	(7		)	(7		)	(15		)	(17		)
	$	200		$	207		$	417		$	411

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

Financial data of the business segments follows:

	Three Months Ended						Six Months Ended
	June 30,						June 30,
	2013			2012			2013			2012
	(In millions)
Operating Revenues
Electric	$	1,265		$	1,290		$	2,484		$	2,488
Gas	248			214			852			723
Gas Storage and Pipelines	31			27			58			52
Power and Industrial Projects	429			449			919			898
Energy Trading	451			239			844			500
Corporate & Other	1			1			1			2
Reconciliation & Eliminations	(200		)	(207		)	(417		)	(411		)
Total	$	2,225		$	2,013		$	4,741		$	4,252
Net Income (Loss) Attributable to DTE Energy by Segment:
Electric	$	89		$	127		$	204		$	223
Gas	8			4			104			56
Gas Storage and Pipelines	16			17			33			34
Power and Industrial Projects	7			10			19			18
Energy Trading	(2		)	4			5			2
Corporate & Other	(13		)	(15		)	(26		)	(30		)
Discontinued operations	—			(1		)	—			(1		)
Net Income Attributable to DTE Energy	$	105		$	146		$	339		$	302