Segment Information (Details 1) (USD $) In Millions, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2012	Jun. 30, 2011	Jun. 30, 2012	Jun. 30, 2011
Operating Revenues [Abstract]
Operating Revenue	$ 2,025	$ 2,028	$ 4,274	$ 4,459
Segment Reporting Information, Profit (Loss) [Abstract]
Net Income Attributable to DTE Energy Company	146	202	302	378
Electric Utility [Member]
Operating Revenues [Abstract]
Operating Revenue	1,290	1,240	2,488	2,433
Segment Reporting Information, Profit (Loss) [Abstract]
Net Income Attributable to DTE Energy Company	127	103	223	188
Gas Utility [Member]
Operating Revenues [Abstract]
Operating Revenue	214	242	723	931
Segment Reporting Information, Profit (Loss) [Abstract]
Net Income Attributable to DTE Energy Company	4	(3)	56	80
Gas Storage and Pipelines [Member]
Operating Revenues [Abstract]
Operating Revenue	27	23	52	48
Segment Reporting Information, Profit (Loss) [Abstract]
Net Income Attributable to DTE Energy Company	17	14	34	29
Unconventional Gas Production [Member]
Operating Revenues [Abstract]
Operating Revenue	12	10	22	18
Segment Reporting Information, Profit (Loss) [Abstract]
Net Income Attributable to DTE Energy Company	(2)	(1)	(3)	(3)
Power and Industrial Projects [Member]
Operating Revenues [Abstract]
Operating Revenue	449	287	898	522
Segment Reporting Information, Profit (Loss) [Abstract]
Net Income Attributable to DTE Energy Company	10	5	18	15
Energy Trading [Member]
Operating Revenues [Abstract]
Operating Revenue	239	306	500	628
Segment Reporting Information, Profit (Loss) [Abstract]
Net Income Attributable to DTE Energy Company	4	12	2	14
Corporate and Other [Member]
Operating Revenues [Abstract]
Operating Revenue	1	1	2	2
Segment Reporting Information, Profit (Loss) [Abstract]
Net Income Attributable to DTE Energy Company	(14)	72	(28)	55
Intersegment Elimination [Member]
Operating Revenues [Abstract]
Operating Revenue	$ (207)	$ (81)	$ (411)	$ (123)