Segment Information (Tables)

3 Months Ended

Mar. 31, 2014

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
	March 31,
	2014		2013
	(In millions)
Inter-segment Revenues
Electric	$	7	$	6
Gas	2		1
Gas Storage and Pipelines	1		2
Power and Industrial Projects	206		205
Energy Trading	9		11
Corporate and Other	2		(8		)
	$	227	$	217

Financial data of the business segments follows:

	Three Months Ended
	March 31,
	2014			2013
	(In millions)
Operating Revenues
Electric	$	1,412		$	1,219
Gas	804			604
Gas Storage and Pipelines	52			27
Power and Industrial Projects	575			490
Energy Trading	1,314			393
Corporate & Other	—			—
Reconciliation & Eliminations	(227		)	(217		)
Total	$	3,930		$	2,516

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

Net Income (Loss) Attributable to DTE Energy by Segment:
Electric	$	136		$	115
Gas	129			96
Gas Storage and Pipelines	21			17
Power and Industrial Projects	15			12
Energy Trading	42			7
Corporate & Other	(17		)	(13		)
Net Income Attributable to DTE Energy	$	326		$	234