Segment Information (Details 1) (USD $) In Millions, unless otherwise specified	3 Months Ended								12 Months Ended
	Dec. 31, 2012	Sep. 30, 2012	Jun. 30, 2012	Mar. 31, 2012	Dec. 31, 2011	Sep. 30, 2011	Jun. 30, 2011	Mar. 31, 2011	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Segment Reporting Information [Line Items]
Depreciation, Depletion and Amortization									$ 1,018	$ 995	$ 1,027
Interest Expense									440	488	543
Income Taxes									173	(205)	93
Net Income Attributable to DTE Energy Company	81	227	146	156	150	183	202	176	610	711	630
Total Assets	26,339				26,009				26,339	26,009
Goodwill	2,018				2,020				2,018	2,020	2,020
Income (Loss) from Discontinued Operations, Net of Tax, Attributable to Parent	(56.00)	1.00	(1.00)	0	(1.00)	0	(1.00)	(1.00)	(56.00)	(3.00)	(8.00)
Electric [Member]
Segment Reporting Information [Line Items]
Operating Revenue									5,293	5,154	4,993
Depreciation, Depletion and Amortization									827	818	849
Interest Income									(1)	(1)	(1)
Interest Expense									272	289	313
Income Taxes									280	265	270
Net Income Attributable to DTE Energy Company									483	434	441
Total Assets	17,755				17,567				17,755	17,567	16,611
Goodwill	1,208				1,208				1,208	1,208	1,206
Capital Expenditures									1,230	1,203	864
Gas [Member]
Segment Reporting Information [Line Items]
Operating Revenue									1,315	1,505	1,648
Depreciation, Depletion and Amortization									92	89	92
Interest Income									(7)	(7)	(9)
Interest Expense									59	64	66
Income Taxes									50	60	67
Net Income Attributable to DTE Energy Company									115	110	127
Total Assets	4,059				4,065				4,059	4,065	3,925
Goodwill	745				745				745	745	759
Capital Expenditures									220	179	147
Gas Storage and Pipelines [Member]
Segment Reporting Information [Line Items]
Operating Revenue									96	91	83
Depreciation, Depletion and Amortization									8	6	5
Interest Income									(8)	(5)	(1)
Interest Expense									8	7	6
Income Taxes									39	35	32
Net Income Attributable to DTE Energy Company									61	57	51
Total Assets	668				538				668	538	446
Goodwill	22				22				22	22	9
Capital Expenditures									233	16	5
Power and Industrial Projects [Member]
Segment Reporting Information [Line Items]
Operating Revenue									1,823	1,129	1,144
Depreciation, Depletion and Amortization									65	60	60
Interest Income									(7)	(8)	(3)
Interest Expense									37	32	33
Income Taxes									(44)	11	3
Net Income Attributable to DTE Energy Company									42	38	85
Total Assets	991				789				991	789	872
Goodwill	26				26				26	26	27
Capital Expenditures									83	56	53
Energy Trading [Member]
Segment Reporting Information [Line Items]
Operating Revenue									1,109	1,276	875
Depreciation, Depletion and Amortization									2	3	5
Interest Income									0	0	0
Interest Expense									8	9	13
Income Taxes									7	34	5
Net Income Attributable to DTE Energy Company									12	52	6
Total Assets	629				612				629	612	513
Goodwill	17				17				17	17	17
Capital Expenditures									1	1	1
Corporate and Other [Member]
Segment Reporting Information [Line Items]
Operating Revenue									3	4	1
Depreciation, Depletion and Amortization									1	1	1
Interest Income									(52)	(47)	(47)
Interest Expense									121	145	160
Income Taxes									(46)	(136)	(62)
Net Income Attributable to DTE Energy Company									(47)	23	(72)
Total Assets	3,074				2,605				3,074	2,605	2,616
Goodwill	0				0				0	0	0
Capital Expenditures									3	0	0
Corporate Elimination [Member]
Segment Reporting Information [Line Items]
Operating Revenue									(848)	(301)	(219)
Depreciation, Depletion and Amortization									0	0	0
Interest Income									65	58	49
Interest Expense									(65)	(58)	(48)
Income Taxes									0	(1)	0
Net Income Attributable to DTE Energy Company									0	0	0
Total Assets	(837)				(485)				(837)	(485)	(413)
Goodwill	0				0				0	0	0
Capital Expenditures									0	0	0
Segment, Continuing Operations [Member]
Segment Reporting Information [Line Items]
Operating Revenue									8,791	8,858	8,525
Depreciation, Depletion and Amortization									995	977	1,012
Interest Income									(10)	(10)	(12)
Interest Expense									440	488	543
Income Taxes									286	268	315
Net Income Attributable to DTE Energy Company									666	714	638
Total Assets	26,339				25,691				26,339	25,691	24,570
Goodwill	2,018				2,018				2,018	2,018	2,018
Capital Expenditures									1,770	1,455	1,070
Segment, Discontinued Operations [Member]
Segment Reporting Information [Line Items]
Total Assets	0				318				0	318	326
Goodwill	0				2				0	2	2
Capital Expenditures									49	29	27
Income (Loss) from Discontinued Operations, Net of Tax, Attributable to Parent									(56.00)	(3.00)	(8.00)
Total [Member]
Segment Reporting Information [Line Items]
Net Income Attributable to DTE Energy Company									610	711	630
Total Assets	26,339				26,009				26,339	26,009	24,896
Goodwill	2,018				2,020				2,018	2,020	2,020
Capital Expenditures									$ 1,819	$ 1,484	$ 1,097