Segment and Related Information (Financial Data of Business Segments) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2023
Segment Reporting Information [Line Items]
Operating Revenues — Utility operations	$ 8,849	$ 7,990	$ 7,466
Operating Revenues — Non-utility operations	6,965	4,467	5,279
Depreciation and amortization	1,841	1,732	1,606
Interest expense	1,056	951	791
Interest income	(103)	(136)	(57)
Equity earnings of equity method investees	47	15	3
Other segment items (pre-tax)	11,423	8,525	8,836
Income Tax Expense (Benefit)	88	(34)	169
Net Income (Loss) Attributable to DTE Energy Company	1,462	1,404	1,397
Other Segment Financial Data
Investments in equity method investees	122	128	166
Capital expenditures and acquisitions	4,639	4,467	3,934
Goodwill	1,993	1,993	1,993
Total Assets	54,066	48,846	44,755
Operating Segments
Segment Reporting Information [Line Items]
Operating Revenues — Utility operations	8,937	8,075	7,552
Operating Revenues — Non-utility operations	7,223	4,612	5,435
Depreciation and amortization	1,841	1,732	1,606
Interest expense	727	658	567
Interest income	(114)	(108)	(70)
Equity earnings of equity method investees	20	16	8
Other segment items (pre-tax)	11,815	8,749	9,060
Income Tax Expense (Benefit)	141	51	261
Net Income (Loss) Attributable to DTE Energy Company	1,730	1,589	1,555
Other Segment Financial Data
Investments in equity method investees	100	105	139
Capital expenditures and acquisitions	4,639	4,467	3,934
Goodwill	1,993	1,993	1,993
Total Assets	52,096	47,098	42,302
Operating Segments | Electric
Segment Reporting Information [Line Items]
Operating Revenues — Utility operations	6,885	6,277	5,804
Operating Revenues — Non-utility operations	50	16	14
Depreciation and amortization	1,553	1,447	1,340
Interest expense	555	498	432
Interest income	(9)	(7)	(20)
Equity earnings of equity method investees	0	0	0
Other segment items (pre-tax)	3,605	3,314	3,216
Income Tax Expense (Benefit)	73	(31)	78
Net Income (Loss) Attributable to DTE Energy Company	1,158	1,072	772
Other Segment Financial Data
Investments in equity method investees	4	5	5
Capital expenditures and acquisitions	3,892	3,659	3,128
Goodwill	1,208	1,208	1,208
Total Assets	39,370	35,400	32,292
Operating Segments | Gas segment
Segment Reporting Information [Line Items]
Operating Revenues — Utility operations	2,052	1,798	1,748
Operating Revenues — Non-utility operations	0	0	0
Depreciation and amortization	225	221	209
Interest expense	132	118	102
Interest income	(11)	(10)	(9)
Equity earnings of equity method investees	1	1	1
Other segment items (pre-tax)	1,322	1,134	1,058
Income Tax Expense (Benefit)	88	77	93
Net Income (Loss) Attributable to DTE Energy Company	295	257	294
Other Segment Financial Data
Investments in equity method investees	19	18	16
Capital expenditures and acquisitions	661	740	746
Goodwill	743	743	743
Total Assets	8,987	8,474	7,722
Operating Segments | DTE Vantage
Segment Reporting Information [Line Items]
Operating Revenues — Utility operations	0	0	0
Operating Revenues — Non-utility operations	696	753	809
Depreciation and amortization	59	59	53
Interest expense	30	28	15
Interest income	(87)	(76)	(32)
Equity earnings of equity method investees	19	15	7
Other segment items (pre-tax)	582	629	635
Income Tax Expense (Benefit)	(61)	(37)	(22)
Net Income (Loss) Attributable to DTE Energy Company	154	135	153
Other Segment Financial Data
Investments in equity method investees	77	82	118
Capital expenditures and acquisitions	80	65	57
Goodwill	25	25	25
Total Assets	2,426	2,065	1,122
Operating Segments | Energy Trading segment
Segment Reporting Information [Line Items]
Operating Revenues — Utility operations	0	0	0
Operating Revenues — Non-utility operations	6,477	3,843	4,612
Depreciation and amortization	4	5	4
Interest expense	10	14	18
Interest income	(7)	(15)	(9)
Equity earnings of equity method investees	0	0	0
Other segment items (pre-tax)	6,306	3,672	4,151
Income Tax Expense (Benefit)	41	42	112
Net Income (Loss) Attributable to DTE Energy Company	123	125	336
Other Segment Financial Data
Investments in equity method investees	0	0	0
Capital expenditures and acquisitions	6	3	3
Goodwill	17	17	17
Total Assets	1,313	1,159	1,166
Corporate and Other
Segment Reporting Information [Line Items]
Operating Revenues — Utility operations	0	0	0
Operating Revenues — Non-utility operations	0	0	0
Depreciation and amortization	0	0	0
Interest expense	409	351	270
Interest income	(69)	(86)	(33)
Equity earnings of equity method investees	27	(1)	(5)
Other segment items (pre-tax)	(46)	6	18
Income Tax Expense (Benefit)	(53)	(85)	(92)
Net Income (Loss) Attributable to DTE Energy Company	(268)	(185)	(158)
Other Segment Financial Data
Investments in equity method investees	22	23	27
Capital expenditures and acquisitions	0	0	0
Goodwill	0	0	0
Total Assets	5,145	4,723	4,150
Reclassifications and Eliminations
Segment Reporting Information [Line Items]
Operating Revenues — Utility operations	(88)	(85)	(86)
Operating Revenues — Non-utility operations	(258)	(145)	(156)
Depreciation and amortization	0	0	0
Interest expense	(80)	(58)	(46)
Interest income	80	58	46
Equity earnings of equity method investees	0	0	0
Other segment items (pre-tax)	(346)	(230)	(242)
Income Tax Expense (Benefit)	0	0	0
Net Income (Loss) Attributable to DTE Energy Company	0	0	0
Other Segment Financial Data
Investments in equity method investees	0	0	0
Capital expenditures and acquisitions	0	0	0
Goodwill	0	0	0
Total Assets	(3,175)	(2,975)	(1,697)
Reclassifications and Eliminations | Electric
Segment Reporting Information [Line Items]
Operating Revenues — Non-utility operations	$ (4)	$ (3)	$ (3)