Segment and Related Information (Financial Data) (Details) - USD ($) $ in Millions	3 Months Ended								12 Months Ended
	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Segment Reporting Information [Line Items]
Utility operations									$ 6,238	$ 6,884	$ 6,643
Operating Revenues	$ 2,487	$ 2,598	$ 2,268	$ 2,984	$ 3,078	$ 2,595	$ 2,698	$ 3,930	10,337	12,301	9,661
Non-utility operations									4,099	5,417	3,018
Depreciation and amortization									852	1,145	1,094
Interest income									(13)	(10)	(9)
Interest expense									450	429	436
Equity in earnings of equity method investees									66	48	59
Income Tax Expense (Benefit)									230	364	254
Net Income	80	$ 265	$ 109	$ 273	299	$ 156	$ 124	$ 326	727	905	661
Investments in equity method investees	514				434				514	434	415
Capital expenditures and acquisitions									2,261	2,049	1,876
Goodwill	2,018				2,018				2,018	2,018	2,018
Total Assets	28,737				27,899				28,737	27,899	25,935
Gas Storage and Pipelines
Segment Reporting Information [Line Items]
Investments in equity method investees	296				224				296	224
Operating Segments | DTE Electric
Segment Reporting Information [Line Items]
Utility operations									4,901	5,283	5,199
Non-utility operations									0	0	0
Depreciation and amortization									637	933	902
Interest income									0	(1)	(1)
Interest expense									258	250	268
Equity in earnings of equity method investees									2	1	1
Income Tax Expense (Benefit)									290	296	252
Net Income									542	528	484
Investments in equity method investees	10				8				10	8	9
Capital expenditures and acquisitions									1,785	1,561	1,325
Goodwill	1,208				1,208				1,208	1,208	1,208
Total Assets	19,539				18,713				19,539	18,713	17,508
Operating Segments | DTE Gas
Segment Reporting Information [Line Items]
Utility operations									1,376	1,636	1,474
Non-utility operations									0	0	0
Depreciation and amortization									104	99	95
Interest income									(7)	(7)	(7)
Interest expense									62	57	58
Equity in earnings of equity method investees									6	7	6
Income Tax Expense (Benefit)									72	78	77
Net Income									132	140	143
Investments in equity method investees	9				10				9	10	10
Capital expenditures and acquisitions									273	224	209
Goodwill	743				743				743	743	743
Total Assets	4,299				4,247				4,299	4,247	3,920
Operating Segments | Gas Storage and Pipelines
Segment Reporting Information [Line Items]
Utility operations									0	0	0
Non-utility operations									243	203	132
Depreciation and amortization									30	34	23
Interest income									(8)	(6)	(7)
Interest expense									24	22	18
Equity in earnings of equity method investees									47	35	44
Income Tax Expense (Benefit)									70	53	45
Net Income									107	82	70
Investments in equity method investees	296				224				296	224	201
Capital expenditures and acquisitions									161	184	245
Goodwill	24				24				24	24	24
Total Assets	1,047				883				1,047	883	823
Operating Segments | Power and Industrial Projects
Segment Reporting Information [Line Items]
Utility operations									0	0	0
Non-utility operations									2,224	2,289	1,950
Depreciation and amortization									78	77	72
Interest income									(8)	(5)	(6)
Interest expense									32	28	27
Equity in earnings of equity method investees									8	5	8
Income Tax Expense (Benefit)									(140)	(100)	(45)
Net Income									16	90	66
Investments in equity method investees	183				184				183	184	189
Capital expenditures and acquisitions									36	77	93
Goodwill	26				26				26	26	26
Total Assets	860				998				860	998	1,054
Operating Segments | Energy Trading
Segment Reporting Information [Line Items]
Utility operations									0	0	0
Non-utility operations									2,459	3,762	1,771
Depreciation and amortization									2	1	1
Interest income									(2)	0	0
Interest expense									6	7	8
Equity in earnings of equity method investees									0	0	0
Income Tax Expense (Benefit)									(15)	77	(38)
Net Income									(22)	122	(58)
Investments in equity method investees	0				0				0	0	0
Capital expenditures and acquisitions									6	3	3
Goodwill	17				17				17	17	17
Total Assets	590				755				590	755	624
Corporate and Other
Segment Reporting Information [Line Items]
Utility operations									0	0	0
Non-utility operations									2	2	3
Depreciation and amortization									1	1	1
Interest income									(52)	(48)	(51)
Interest expense									132	122	120
Equity in earnings of equity method investees									3	0	0
Income Tax Expense (Benefit)									(47)	(40)	(37)
Net Income									(48)	(57)	(44)
Investments in equity method investees	16				8				16	8	6
Capital expenditures and acquisitions									0	0	1
Goodwill	0				0				0	0	0
Total Assets	3,530				3,209				3,530	3,209	2,945
Reclassifications and Eliminations
Segment Reporting Information [Line Items]
Utility operations									(39)	(35)	(30)
Operating Revenues									868	874	868
Non-utility operations									(829)	(839)	(838)
Depreciation and amortization									0	0	0
Interest income									64	57	63
Interest expense									(64)	(57)	(63)
Equity in earnings of equity method investees									0	0	0
Income Tax Expense (Benefit)									0	0	0
Net Income									0	0	0
Investments in equity method investees	0				0				0	0	0
Capital expenditures and acquisitions									0	0	0
Goodwill	0				0				0	0	0
Total Assets	$ (1,128)				$ (906)				(1,128)	(906)	(939)
Reclassifications and Eliminations | DTE Electric | Continuing Operations
Segment Reporting Information [Line Items]
Operating Revenues									36	29	26
Reclassifications and Eliminations | DTE Gas | Continuing Operations
Segment Reporting Information [Line Items]
Operating Revenues									3	6	4
Reclassifications and Eliminations | Gas Storage and Pipelines | Continuing Operations
Segment Reporting Information [Line Items]
Operating Revenues									8	9	3
Reclassifications and Eliminations | Power and Industrial Projects | Continuing Operations
Segment Reporting Information [Line Items]
Operating Revenues									785	794	816
Reclassifications and Eliminations | Energy Trading | Continuing Operations
Segment Reporting Information [Line Items]
Operating Revenues									32	33	43
Reclassifications and Eliminations | Corporate and Other | Continuing Operations
Segment Reporting Information [Line Items]
Operating Revenues									$ 4	$ 3	$ (24)