Segment and Related Information (Financial Data - Operating Revenues Including Inter-Segment Revenues) (Details) - USD ($) $ in Millions	3 Months Ended								12 Months Ended
	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Segment Reporting Information [Line Items]
Operating Revenues — Utility operations									$ 6,638	$ 6,670	$ 6,434
Operating Revenues — Non-utility operations									6,031	7,542	6,173
Depreciation and amortization									1,263	1,124	1,030
Interest expense									641	559	536
Interest income									(17)	(12)	(12)
Equity in earnings of equity method investees									111	132	102
Income Tax Expense (Benefit)									152	98	175
Net Income (Loss) Attributable to DTE Energy Company	$ 267	$ 319	$ 182	$ 401	$ 191	$ 334	$ 234	$ 361	1,169	1,120	1,134
Investments in equity method investees	1,862				1,771				1,862	1,771	1,073
Capital expenditures and acquisitions									5,467	2,713	2,250
Goodwill	2,464				2,293				2,464	2,293	2,293
Total Assets	41,882				36,288				41,882	36,288	33,767
Effect of the Tax Cuts and Jobs Act of 2017									0	21	(105)
Gas Storage and Pipelines
Segment Reporting Information [Line Items]
Investments in equity method investees	1,685				1,585				1,685	1,585
Operating Segments | Electric
Segment Reporting Information [Line Items]
Operating Revenues — Utility operations									5,224	5,298	5,102
Operating Revenues — Non-utility operations									5	0	0
Depreciation and amortization									949	836	753
Interest expense									315	283	274
Interest income									(2)	0	0
Equity in earnings of equity method investees									1	0	1
Income Tax Expense (Benefit)									137	193	321
Net Income (Loss) Attributable to DTE Energy Company									714	664	606
Investments in equity method investees	5				7				5	7	7
Capital expenditures and acquisitions									2,368	1,979	1,574
Goodwill	1,208				1,208				1,208	1,208	1,208
Total Assets	24,617				22,501				24,617	22,501	21,163
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									1,482	1,436	1,388
Operating Revenues — Non-utility operations									0		0
Depreciation and amortization									144	133	123
Interest expense									78	70	65
Interest income									(6)	(6)	(7)
Equity in earnings of equity method investees									2	2	2
Income Tax Expense (Benefit)									62	67	78
Net Income (Loss) Attributable to DTE Energy Company									185	150	146
Investments in equity method investees	11				12				11	12	11
Capital expenditures and acquisitions									530	460	463
Goodwill	743				743				743	743	743
Total Assets	5,717				5,378				5,717	5,378	5,072
Operating Segments | Gas Storage and Pipelines
Segment Reporting Information [Line Items]
Operating Revenues — Utility operations									0	0	0
Operating Revenues — Non-utility operations									501	485	453
Depreciation and amortization									94	82	76
Interest expense									73	68	77
Interest income									(8)	(9)	(14)
Equity in earnings of equity method investees									97	123	90
Income Tax Expense (Benefit)									74	68	(30)
Net Income (Loss) Attributable to DTE Energy Company									204	235	275
Investments in equity method investees	1,685				1,585				1,685	1,585	879
Capital expenditures and acquisitions									2,510	176	137
Goodwill	470				299				470	299	299
Total Assets	4,832				3,161				4,832	3,161	2,594
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									1,560	2,204	2,089
Depreciation and amortization									69	67	72
Interest expense									33	31	29
Interest income									(9)	(9)	(7)
Equity in earnings of equity method investees									14	3	9
Income Tax Expense (Benefit)									(63)	(195)	(195)
Net Income (Loss) Attributable to DTE Energy Company									133	161	138
Investments in equity method investees	130				134				130	134	150
Capital expenditures and acquisitions									54	91	56
Goodwill	26				26				26	26	26
Total Assets	537				495				537	495	593
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									4,610	5,557	4,277
Depreciation and amortization									6	5	5
Interest expense									8	6	5
Interest income									(4)	(3)	(2)
Equity in earnings of equity method investees									0	0	0
Income Tax Expense (Benefit)									17	13	49
Net Income (Loss) Attributable to DTE Energy Company									49	39	72
Investments in equity method investees	0				0				0	0	0
Capital expenditures and acquisitions									5	5	7
Goodwill	17				17				17	17	17
Total Assets	798				909				798	909	725
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	3	2
Depreciation and amortization									1	1	1
Interest expense									266	220	192
Interest income									(120)	(104)	(88)
Equity in earnings of equity method investees									(3)	4	0
Income Tax Expense (Benefit)									(75)	(48)	(48)
Net Income (Loss) Attributable to DTE Energy Company									(116)	(129)	(103)
Investments in equity method investees	31				33				31	33	26
Capital expenditures and acquisitions									0	2	13
Goodwill	0				0				0	0	0
Total Assets	7,679				6,153				7,679	6,153	5,324
Effect of the Tax Cuts and Jobs Act of 2017											34
Reclassifications and Eliminations
Segment Reporting Information [Line Items]
Operating Revenues — Utility operations									(68)	(64)	(56)
Operating Revenues — Non-utility operations									(647)	(707)	(648)
Depreciation and amortization									0	0	0
Interest expense									(132)	(119)	(106)
Interest income									132	119	106
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	$ (2,298)				$ (2,309)				$ (2,298)	$ (2,309)	$ (1,704)