Segment and Related Information (Financial Data - Operating Revenues Including Inter-Segment Revenues) (Details) - USD ($) $ in Millions	3 Months Ended								12 Months Ended
	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Segment Reporting Information [Line Items]
Operating Revenues — Utility operations									$ 6,670	$ 6,434	$ 6,497
Operating Revenues — Non-utility operations									7,542	6,173	4,133
Depreciation and amortization									1,124	1,030	976
Interest expense									559	536	472
Interest income									(12)	(12)	(20)
Equity in earnings of equity method investees									132	102	68
Income Tax Expense (Benefit)									98	175	271
Net Income (Loss) Attributable to DTE Energy Company	$ 191	$ 334	$ 234	$ 361	$ 287	$ 270	$ 177	$ 400	1,120	1,134	868
Investments in equity method investees	1,771				1,073				1,771	1,073	752
Capital expenditures and acquisitions									2,713	2,250	3,269
Goodwill	2,293				2,293				2,293	2,293	2,286
Total Assets	36,288				33,767				36,288	33,767	32,041
Effect of the Tax Cuts and Jobs Act of 2017					(105)				21	(105)	0
Gas Storage and Pipelines
Segment Reporting Information [Line Items]
Investments in equity method investees	1,585				879				1,585	879
Operating Segments | Electric
Segment Reporting Information [Line Items]
Operating Revenues — Utility operations									5,298	5,102	5,225
Operating Revenues — Non-utility operations									0	0	0
Depreciation and amortization									836	753	750
Interest expense									283	274	264
Interest income									0	0	(8)
Equity in earnings of equity method investees									0	1	2
Income Tax Expense (Benefit)									193	321	353
Net Income (Loss) Attributable to DTE Energy Company									664	606	622
Investments in equity method investees	7				7				7	7	11
Capital expenditures and acquisitions									1,979	1,574	1,503
Goodwill	1,208				1,208				1,208	1,208	1,208
Total Assets	22,501				21,163				22,501	21,163	20,417
Operating Segments | Electric | Non-utility Entities
Segment Reporting Information [Line Items]
Effect of the Tax Cuts and Jobs Act of 2017										(5)
Operating Segments | Gas
Segment Reporting Information [Line Items]
Operating Revenues — Utility operations									1,436	1,388	1,324
Operating Revenues — Non-utility operations									0	0	0
Depreciation and amortization									133	123	106
Interest expense									70	65	60
Interest income									(6)	(7)	(6)
Equity in earnings of equity method investees									2	2	6
Income Tax Expense (Benefit)									67	78	77
Net Income (Loss) Attributable to DTE Energy Company									150	146	138
Investments in equity method investees	12				11				12	11	10
Capital expenditures and acquisitions									460	463	395
Goodwill	743				743				743	743	743
Total Assets	5,378				5,072				5,378	5,072	4,729
Operating Segments | Gas Storage and Pipelines
Segment Reporting Information [Line Items]
Operating Revenues — Utility operations									0	0	0
Operating Revenues — Non-utility operations									485	453	302
Depreciation and amortization									82	76	45
Interest expense									68	77	39
Interest income									(9)	(14)	(9)
Equity in earnings of equity method investees									123	90	60
Income Tax Expense (Benefit)									68	(30)	71
Net Income (Loss) Attributable to DTE Energy Company									235	275	119
Investments in equity method investees	1,585				879				1,585	879	538
Capital expenditures and acquisitions									176	137	1,322
Goodwill	299				299				299	299	292
Total Assets	3,161				2,594				3,161	2,594	2,417
Effect of the Tax Cuts and Jobs Act of 2017										(115)
Operating Segments | Power and Industrial Projects
Segment Reporting Information [Line Items]
Operating Revenues — Utility operations									0	0	0
Operating Revenues — Non-utility operations									2,204	2,089	1,906
Depreciation and amortization									67	72	72
Interest expense									31	29	32
Interest income									(9)	(7)	(8)
Equity in earnings of equity method investees									3	9	0
Income Tax Expense (Benefit)									(195)	(195)	(140)
Net Income (Loss) Attributable to DTE Energy Company									161	138	95
Investments in equity method investees	134				150				134	150	166
Capital expenditures and acquisitions									91	56	39
Goodwill	26				26				26	26	26
Total Assets	495				593				495	593	683
Effect of the Tax Cuts and Jobs Act of 2017										(21)
Operating Segments | Energy Trading
Segment Reporting Information [Line Items]
Operating Revenues — Utility operations									0	0	0
Operating Revenues — Non-utility operations									5,557	4,277	2,575
Depreciation and amortization									5	5	3
Interest expense									6	5	6
Interest income									(3)	(2)	(1)
Equity in earnings of equity method investees									0	0	0
Income Tax Expense (Benefit)									13	49	(29)
Net Income (Loss) Attributable to DTE Energy Company									39	72	(45)
Investments in equity method investees	0				0				0	0	0
Capital expenditures and acquisitions									5	7	7
Goodwill	17				17				17	17	17
Total Assets	909				725				909	725	660
Effect of the Tax Cuts and Jobs Act of 2017										2
Operating Segments | Corporate and Other
Segment Reporting Information [Line Items]
Operating Revenues — Utility operations									0	0	0
Operating Revenues — Non-utility operations									3	2	2
Depreciation and amortization									1	1	0
Interest expense									220	192	148
Interest income									(104)	(88)	(65)
Equity in earnings of equity method investees									4	0	0
Income Tax Expense (Benefit)									(48)	(48)	(61)
Net Income (Loss) Attributable to DTE Energy Company									(129)	(103)	(61)
Investments in equity method investees	33				26				33	26	27
Capital expenditures and acquisitions									2	13	3
Goodwill	0				0				0	0	0
Total Assets	6,153				5,324				6,153	5,324	4,648
Effect of the Tax Cuts and Jobs Act of 2017										34
Reclassifications and Eliminations
Segment Reporting Information [Line Items]
Operating Revenues — Utility operations									(64)	(56)	(52)
Operating Revenues — Non-utility operations									(707)	(648)	(652)
Depreciation and amortization									0	0	0
Interest expense									(119)	(106)	(77)
Interest income									119	106	77
Equity in earnings of equity method investees									0	0	0
Income Tax Expense (Benefit)									0	0	0
Net Income (Loss) Attributable to DTE Energy Company									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	$ (2,309)				$ (1,704)				$ (2,309)	$ (1,704)	$ (1,513)