Segment and Related Information (Financial Data - Operating Revenues Including Inter-Segment Revenues) (Details) - USD ($) $ in Millions	3 Months Ended								12 Months Ended
	Dec. 31, 2020	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Segment Reporting Information [Line Items]
Operating Revenues — Utility operations									$ 6,845	$ 6,638	$ 6,670
Operating Revenues — Non-utility operations									5,332	6,031	7,542
Depreciation and amortization									1,443	1,263	1,124
Interest expense									720	641	559
Interest income									(38)	(17)	(12)
Equity in earnings of equity method investees									132	111	132
Income Tax Expense (Benefit)									167	152	98
Net Income (Loss) Attributable to DTE Energy Company	$ 275	$ 476	$ 277	$ 340	$ 267	$ 319	$ 182	$ 401	1,368	1,169	1,120
Investments in equity method investees	1,868				1,862				1,868	1,862	1,771
Capital expenditures and acquisitions									3,983	5,467	2,713
Goodwill	2,466				2,464				2,466	2,464	2,293
Total Assets	45,496				42,268				45,496	42,268	36,288
Gas Storage and Pipelines
Segment Reporting Information [Line Items]
Investments in equity method investees	1,691				1,685				1,691	1,685
Operating Segments | Electric
Segment Reporting Information [Line Items]
Operating Revenues — Utility operations									5,506	5,224	5,298
Operating Revenues — Non-utility operations									14	5	0
Depreciation and amortization									1,057	949	836
Interest expense									337	315	283
Interest income									(4)	(2)	0
Equity in earnings of equity method investees									0	1	0
Income Tax Expense (Benefit)									108	137	193
Net Income (Loss) Attributable to DTE Energy Company									777	714	664
Investments in equity method investees	6				5				6	5	7
Capital expenditures and acquisitions									2,701	2,368	1,979
Goodwill	1,208				1,208				1,208	1,208	1,208
Total Assets	26,588				24,617				26,588	24,617	22,501
Operating Segments | Gas
Segment Reporting Information [Line Items]
Operating Revenues — Utility operations									1,414	1,482	1,436
Operating Revenues — Non-utility operations									0	0	0
Depreciation and amortization									157	144	133
Interest expense									80	78	70
Interest income									(5)	(6)	(6)
Equity in earnings of equity method investees									1	2	2
Income Tax Expense (Benefit)									48	62	67
Net Income (Loss) Attributable to DTE Energy Company									186	185	150
Investments in equity method investees	12				11				12	11	12
Capital expenditures and acquisitions									574	530	460
Goodwill	743				743				743	743	743
Total Assets	6,339				5,717				6,339	5,717	5,378
Operating Segments | Gas Storage and Pipelines
Segment Reporting Information [Line Items]
Operating Revenues — Utility operations									0	0	0
Operating Revenues — Non-utility operations									754	501	485
Depreciation and amortization									151	94	82
Interest expense									113	73	68
Interest income									(9)	(8)	(9)
Equity in earnings of equity method investees									106	97	123
Income Tax Expense (Benefit)									116	74	68
Net Income (Loss) Attributable to DTE Energy Company									315	204	235
Investments in equity method investees	1,691				1,685				1,691	1,685	1,585
Capital expenditures and acquisitions									517	2,510	176
Goodwill	472				470				472	470	299
Total Assets	5,068				4,832				5,068	4,832	3,161
Operating Segments | Power and Industrial Projects
Segment Reporting Information [Line Items]
Operating Revenues — Utility operations									0	0	0
Operating Revenues — Non-utility operations									1,224	1,560	2,204
Depreciation and amortization									72	69	67
Interest expense									37	33	31
Interest income									(22)	(9)	(9)
Equity in earnings of equity method investees									17	14	3
Income Tax Expense (Benefit)									(40)	(63)	(195)
Net Income (Loss) Attributable to DTE Energy Company									134	133	161
Investments in equity method investees	125				130				125	130	134
Capital expenditures and acquisitions									186	54	91
Goodwill	26				26				26	26	26
Total Assets	696				537				696	537	495
Operating Segments | Energy Trading
Segment Reporting Information [Line Items]
Operating Revenues — Utility operations									0	0	0
Operating Revenues — Non-utility operations									3,863	4,610	5,557
Depreciation and amortization									5	6	5
Interest expense									6	8	6
Interest income									(2)	(4)	(3)
Equity in earnings of equity method investees									0	0	0
Income Tax Expense (Benefit)									12	17	13
Net Income (Loss) Attributable to DTE Energy Company									36	49	39
Investments in equity method investees	0				0				0	0	0
Capital expenditures and acquisitions									5	5	5
Goodwill	17				17				17	17	17
Total Assets	807				798				807	798	909
Operating Segments | Corporate and Other
Segment Reporting Information [Line Items]
Operating Revenues — Utility operations									0	0	0
Operating Revenues — Non-utility operations									2	2	3
Depreciation and amortization									1	1	1
Interest expense									331	266	220
Interest income									(180)	(120)	(104)
Equity in earnings of equity method investees									8	(3)	4
Income Tax Expense (Benefit)									(77)	(75)	(48)
Net Income (Loss) Attributable to DTE Energy Company									(80)	(116)	(129)
Investments in equity method investees	34				31				34	31	33
Capital expenditures and acquisitions									0	0	2
Goodwill	0				0				0	0	0
Total Assets	8,071				7,610				8,071	7,610	6,153
Reclassifications and Eliminations
Segment Reporting Information [Line Items]
Operating Revenues — Utility operations									(75)	(68)	(64)
Operating Revenues — Non-utility operations									(525)	(647)	(707)
Depreciation and amortization									0	0	0
Interest expense									(184)	(132)	(119)
Interest income									184	132	119
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	$ (2,073)				$ (1,843)				(2,073)	$ (1,843)	$ (2,309)
Reclassifications and Eliminations | Electric
Segment Reporting Information [Line Items]
Operating Revenues — Non-utility operations									$ (2)