Segment and Related Information (Financial Data - Operating Revenues Including Inter-Segment Revenues) (Details) - USD ($) $ in Millions	3 Months Ended								12 Months Ended
	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Segment Reporting Information [Line Items]
Operating Revenues — Utility operations									$ 6,434	$ 6,497	$ 6,238
Operating Revenues — Non-utility operations									6,173	4,133	4,099
Depreciation and amortization									1,030	976	852
Interest expense									536	472	450
Interest income									(12)	(20)	(13)
Equity in earnings of equity method investees									102	68	66
Income Tax Expense (Benefit)									175	271	230
Net Income (Loss) Attributable to DTE Energy Company	$ 287	$ 270	$ 177	$ 400	$ 131	$ 338	$ 152	$ 247	1,134	868	727
Investments in equity method investees	1,073				752				1,073	752	514
Capital expenditures and acquisitions									2,250	3,269	2,261
Goodwill	2,293				2,286				2,293	2,286	2,018
Total Assets	33,767				32,041				33,767	32,041	28,662
Effect of the Tax Cuts and Jobs Act of 2017	(105)								(105)	0	0
Gas Storage and Pipelines
Segment Reporting Information [Line Items]
Investments in equity method investees	879				538				879	538
Operating Segments | Electric
Segment Reporting Information [Line Items]
Operating Revenues — Utility operations									5,102	5,225	4,901
Operating Revenues — Non-utility operations									0	0	0
Depreciation and amortization									753	750	637
Interest expense									274	264	258
Interest income									0	(8)	0
Equity in earnings of equity method investees									1	2	2
Income Tax Expense (Benefit)									321	353	290
Net Income (Loss) Attributable to DTE Energy Company									606	622	542
Investments in equity method investees	7				11				7	11	10
Capital expenditures and acquisitions									1,574	1,503	1,785
Goodwill	1,208				1,208				1,208	1,208	1,208
Total Assets	21,163				20,417				21,163	20,417	19,503
Operating Segments | Gas
Segment Reporting Information [Line Items]
Operating Revenues — Utility operations									1,388	1,324	1,376
Operating Revenues — Non-utility operations									0	0	0
Depreciation and amortization									123	106	104
Interest expense									65	60	62
Interest income									(7)	(6)	(7)
Equity in earnings of equity method investees									2	6	6
Income Tax Expense (Benefit)									78	77	72
Net Income (Loss) Attributable to DTE Energy Company									146	138	132
Investments in equity method investees	11				10				11	10	9
Capital expenditures and acquisitions									463	395	273
Goodwill	743				743				743	743	743
Total Assets	5,072				4,729				5,072	4,729	4,294
Operating Segments | Gas Storage and Pipelines
Segment Reporting Information [Line Items]
Operating Revenues — Utility operations									0	0	0
Operating Revenues — Non-utility operations									453	302	243
Depreciation and amortization									76	45	30
Interest expense									77	39	24
Interest income									(14)	(9)	(8)
Equity in earnings of equity method investees									90	60	47
Income Tax Expense (Benefit)									(30)	71	70
Net Income (Loss) Attributable to DTE Energy Company									275	119	107
Investments in equity method investees	879				538				879	538	296
Capital expenditures and acquisitions									137	1,322	161
Goodwill	299				292				299	292	24
Total Assets	2,594				2,417				2,594	2,417	1,047
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									2,089	1,906	2,224
Depreciation and amortization									72	72	78
Interest expense									29	32	32
Interest income									(7)	(8)	(8)
Equity in earnings of equity method investees									9	0	8
Income Tax Expense (Benefit)									(195)	(140)	(140)
Net Income (Loss) Attributable to DTE Energy Company									138	95	16
Investments in equity method investees	150				166				150	166	183
Capital expenditures and acquisitions									56	39	36
Goodwill	26				26				26	26	26
Total Assets	593				683				593	683	860
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									4,277	2,575	2,459
Depreciation and amortization									5	3	2
Interest expense									5	6	6
Interest income									(2)	(1)	(2)
Equity in earnings of equity method investees									0	0	0
Income Tax Expense (Benefit)									49	(29)	(15)
Net Income (Loss) Attributable to DTE Energy Company									72	(45)	(22)
Investments in equity method investees	0				0				0	0	0
Capital expenditures and acquisitions									7	7	6
Goodwill	17				17				17	17	17
Total Assets	725				660				725	660	590
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									2	2	2
Depreciation and amortization									1	0	1
Interest expense									192	148	132
Interest income									(88)	(65)	(52)
Equity in earnings of equity method investees									0	0	3
Income Tax Expense (Benefit)									(48)	(61)	(47)
Net Income (Loss) Attributable to DTE Energy Company									(103)	(61)	(48)
Investments in equity method investees	26				27				26	27	16
Capital expenditures and acquisitions									13	3	0
Goodwill	0				0				0	0	0
Total Assets	5,324				4,648				5,324	4,648	3,496
Effect of the Tax Cuts and Jobs Act of 2017									34
Reclassifications and Eliminations
Segment Reporting Information [Line Items]
Operating Revenues — Utility operations									(56)	(52)	(39)
Operating Revenues — Non-utility operations									(648)	(652)	(829)
Depreciation and amortization									0	0	0
Interest expense									(106)	(77)	(64)
Interest income									106	77	64
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	$ (1,704)				$ (1,513)				(1,704)	$ (1,513)	$ (1,128)
Non-utility Entities | Operating Segments | Electric
Segment Reporting Information [Line Items]
Effect of the Tax Cuts and Jobs Act of 2017									$ (5)