Segment and Related Information (Financial Data) (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended								12 Months Ended
	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Segment Reporting Information [Line Items]
Operating Revenues	$ 3,078	$ 2,595	$ 2,698	$ 3,930	$ 2,533	$ 2,387	$ 2,225	$ 2,516	$ 12,301	$ 9,661	$ 8,791
Depreciation, Depletion and Amortization									1,145	1,094	1,018
Interest income									(10)	(9)	(10)
Interest Expense									429	436	440
Income Taxes									364	254	286
Net Income Attributable to DTE Energy Company	299	156	124	326	124	198	105	234	905	661	610
Total Assets	27,974				25,935				27,974	25,935	26,339
Goodwill	2,018				2,018				2,018	2,018	2,018
Capital Expenditures and Acquisitions									2,049	1,876	2,018
Continuing Operations [Member]
Segment Reporting Information [Line Items]
Operating Revenues											8,791
Depreciation, Depletion and Amortization											995
Interest income											(10)
Interest Expense											440
Income Taxes											286
Net Income Attributable to DTE Energy Company											666
Total Assets											26,339
Goodwill											2,018
Capital Expenditures and Acquisitions											1,969
Discontinued Operations [Member]
Segment Reporting Information [Line Items]
Net Income Attributable to DTE Energy Company											(56)
Total Assets											0
Goodwill											0
Capital Expenditures and Acquisitions											49
Operating Segments [Member] | Electric [Member]
Segment Reporting Information [Line Items]
Operating Revenues									5,283	5,199	5,293
Depreciation, Depletion and Amortization									933	902	827
Interest income									(1)	(1)	(1)
Interest Expense									250	268	272
Income Taxes									296	252	280
Net Income Attributable to DTE Energy Company									528	484	483
Total Assets	18,715				17,508				18,715	17,508	17,755
Goodwill	1,208				1,208				1,208	1,208	1,208
Capital Expenditures and Acquisitions									1,561	1,325	1,230
Operating Segments [Member] | Gas [Member]
Segment Reporting Information [Line Items]
Operating Revenues									1,636	1,474	1,315
Depreciation, Depletion and Amortization									99	95	92
Interest income									(7)	(7)	(7)
Interest Expense									57	58	59
Income Taxes									78	77	50
Net Income Attributable to DTE Energy Company									140	143	115
Total Assets	4,283				3,938				4,283	3,938	4,059
Goodwill	743				743				743	743	745
Capital Expenditures and Acquisitions									224	209	221
Operating Segments [Member] | Power and Industrial Projects [Member]
Segment Reporting Information [Line Items]
Operating Revenues									2,289	1,950	1,823
Depreciation, Depletion and Amortization									77	72	65
Interest income									(5)	(6)	(7)
Interest Expense									28	27	37
Income Taxes									(100)	(45)	(44)
Net Income Attributable to DTE Energy Company									90	66	42
Total Assets	1,009				1,067				1,009	1,067	991
Goodwill	26				26				26	26	26
Capital Expenditures and Acquisitions									77	93	281
Operating Segments [Member] | Gas Storage and Pipelines [Member]
Segment Reporting Information [Line Items]
Operating Revenues									203	132	96
Depreciation, Depletion and Amortization									34	23	8
Interest income									(6)	(7)	(8)
Interest Expense									22	18	8
Income Taxes									53	45	39
Net Income Attributable to DTE Energy Company									82	70	61
Total Assets	884				824				884	824	668
Goodwill	24				24				24	24	22
Capital Expenditures and Acquisitions									184	245	233
Operating Segments [Member] | Energy Trading [Member]
Segment Reporting Information [Line Items]
Operating Revenues									3,762	1,771	1,109
Depreciation, Depletion and Amortization									1	1	2
Interest income									0	0	0
Interest Expense									7	8	8
Income Taxes									77	(38)	7
Net Income Attributable to DTE Energy Company									122	(58)	12
Total Assets	755				623				755	623	629
Goodwill	17				17				17	17	17
Capital Expenditures and Acquisitions									3	3	1
Operating Segments [Member] | Corporate and Other [Member]
Segment Reporting Information [Line Items]
Operating Revenues									2	3	3
Depreciation, Depletion and Amortization									1	1	1
Interest income									(48)	(51)	(52)
Interest Expense									122	120	121
Income Taxes									(40)	(37)	(46)
Net Income Attributable to DTE Energy Company									(57)	(44)	(47)
Total Assets	3,209				2,945				3,209	2,945	3,074
Goodwill	0				0				0	0	0
Capital Expenditures and Acquisitions									0	1	3
Intersegment Eliminations [Member]
Segment Reporting Information [Line Items]
Operating Revenues									(874)	(868)	(848)
Depreciation, Depletion and Amortization									0	0	0
Interest income									57	63	65
Interest Expense									(57)	(63)	(65)
Income Taxes									0	0	0
Net Income Attributable to DTE Energy Company									0	0	0
Total Assets	(881)				(970)				(881)	(970)	(837)
Goodwill	0				0				0	0	0
Capital Expenditures and Acquisitions									0	0	0
Intersegment Eliminations [Member] | Discontinued Operations [Member]
Segment Reporting Information [Line Items]
Operating Revenues									0	0	(2)
Intersegment Eliminations [Member] | Electric [Member] | Continuing Operations [Member]
Segment Reporting Information [Line Items]
Operating Revenues									(29)	(26)	(29)
Intersegment Eliminations [Member] | Gas [Member] | Continuing Operations [Member]
Segment Reporting Information [Line Items]
Operating Revenues									(6)	(4)	(4)
Intersegment Eliminations [Member] | Power and Industrial Projects [Member] | Continuing Operations [Member]
Segment Reporting Information [Line Items]
Operating Revenues									(794)	(816)	(801)
Intersegment Eliminations [Member] | Gas Storage and Pipelines [Member] | Continuing Operations [Member]
Segment Reporting Information [Line Items]
Operating Revenues									(9)	(3)	(6)
Intersegment Eliminations [Member] | Energy Trading [Member] | Continuing Operations [Member]
Segment Reporting Information [Line Items]
Operating Revenues									(33)	(43)	(43)
Intersegment Eliminations [Member] | Corporate and Other [Member] | Continuing Operations [Member]
Segment Reporting Information [Line Items]
Operating Revenues									$ (3)	$ 24	$ 37