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Segment and Related Information (Profit (Loss) Financial Data) (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2025
Jun. 30, 2025
Mar. 31, 2025
Sep. 30, 2024
Jun. 30, 2024
Mar. 31, 2024
Sep. 30, 2025
Sep. 30, 2024
Dec. 31, 2024
Segment Reporting Information [Line Items]                  
Operating Revenues — Utility operations $ 2,223     $ 1,903     $ 6,509 $ 5,938  
Operating Revenues — Non-utility operations 1,304     1,003     4,877 3,083  
Depreciation and amortization 464     438     1,367 1,288  
Interest expense 271     252     777 703  
Interest income (26)     (48)     (74) (102)  
Equity earnings of equity method investees 5     12     16 36  
Other segment items (pre-tax) 2,400     1,896     8,230 6,048  
Income Tax Expense (Benefit) (6)     (121)     (23) (64)  
Net Income (Loss) Attributable to DTE Energy Company 419 $ 229 $ 445 477 $ 322 $ 313 1,093 1,112  
Other Financial Data                  
Investments in equity method investees 130           130   $ 128
Capital expenditures and acquisitions             3,277   4,467
Goodwill 1,993           1,993   1,993
Total Assets 52,028           52,028   48,846
Operating segments                  
Segment Reporting Information [Line Items]                  
Operating Revenues — Utility operations 2,246     1,925     6,574 6,002  
Operating Revenues — Non-utility operations 1,356     1,032     5,072 3,176  
Depreciation and amortization 464     438     1,367 1,288  
Interest expense 185     169     540 489  
Interest income (27)     (26)     (83) (78)  
Equity earnings of equity method investees 5     11     17 36  
Other segment items (pre-tax) 2,473     1,947     8,481 6,200  
Income Tax Expense (Benefit) (32)     (81)     16 48  
Net Income (Loss) Attributable to DTE Energy Company 534     499     1,308 1,195  
Other Financial Data                  
Investments in equity method investees 108           108   105
Capital expenditures and acquisitions             3,277   4,467
Goodwill 1,993           1,993   1,993
Total Assets 50,326           50,326   47,098
Operating segments | Electric                  
Segment Reporting Information [Line Items]                  
Operating Revenues — Utility operations 2,037     1,695     5,173 4,772  
Operating Revenues — Non-utility operations 14     2     23 11  
Depreciation and amortization 390     365     1,152 1,075  
Interest expense 143     128     414 371  
Interest income (2)     (1)     (6) (6)  
Equity earnings of equity method investees 0     0     0 0  
Other segment items (pre-tax) 1,028     869     2,716 2,502  
Income Tax Expense (Benefit) (14)     (101)     (27) (45)  
Net Income (Loss) Attributable to DTE Energy Company 506     437     947 886  
Other Financial Data                  
Investments in equity method investees 4           4   5
Capital expenditures and acquisitions             2,770   3,659
Goodwill 1,208           1,208   1,208
Total Assets 38,137           38,137   35,400
Operating segments | Gas                  
Segment Reporting Information [Line Items]                  
Operating Revenues — Utility operations 209     230     1,401 1,230  
Operating Revenues — Non-utility operations 0     0     0 0  
Depreciation and amortization 59     57     168 166  
Interest expense 33     29     97 86  
Interest income (3)     (2)     (9) (8)  
Equity earnings of equity method investees 0     0     1 1  
Other segment items (pre-tax) 171     164     918 785  
Income Tax Expense (Benefit) (13)     (5)     52 47  
Net Income (Loss) Attributable to DTE Energy Company (38)     (13)     174 153  
Other Financial Data                  
Investments in equity method investees 19           19   18
Capital expenditures and acquisitions             440   740
Goodwill 743           743   743
Total Assets 8,851           8,851   8,474
Operating segments | DTE Vantage                  
Segment Reporting Information [Line Items]                  
Operating Revenues — Utility operations 0     0     0 0  
Operating Revenues — Non-utility operations 163     190     520 555  
Depreciation and amortization 15     14     44 43  
Interest expense 6     8     22 21  
Interest income (21)     (21)     (62) (52)  
Equity earnings of equity method investees 5     11     16 35  
Other segment items (pre-tax) 141     134     434 415  
Income Tax Expense (Benefit) (16)     11     (37) 19  
Net Income (Loss) Attributable to DTE Energy Company 33     33     103 74  
Other Financial Data                  
Investments in equity method investees 85           85   82
Capital expenditures and acquisitions             63   65
Goodwill 25           25   25
Total Assets 2,328           2,328   2,065
Operating segments | Energy Trading                  
Segment Reporting Information [Line Items]                  
Operating Revenues — Utility operations 0     0     0 0  
Operating Revenues — Non-utility operations 1,179     840     4,529 2,610  
Depreciation and amortization 0     2     3 4  
Interest expense 3     4     7 11  
Interest income (1)     (2)     (6) (12)  
Equity earnings of equity method investees 0     0     0 0  
Other segment items (pre-tax) 1,133     780     4,413 2,498  
Income Tax Expense (Benefit) 11     14     28 27  
Net Income (Loss) Attributable to DTE Energy Company 33     42     84 82  
Other Financial Data                  
Investments in equity method investees 0           0   0
Capital expenditures and acquisitions             4   3
Goodwill 17           17   17
Total Assets 1,010           1,010   1,159
Corporate and Other                  
Segment Reporting Information [Line Items]                  
Operating Revenues — Utility operations 0     0     0 0  
Operating Revenues — Non-utility operations 0     0     0 0  
Depreciation and amortization 0     0     0 0  
Interest expense 104     97     297 259  
Interest income (17)     (36)     (51) (69)  
Equity earnings of equity method investees 0     1     (1)  
Other segment items (pre-tax) 2         9 5  
Income Tax Expense (Benefit) 26     (40)     (39) (112)  
Net Income (Loss) Attributable to DTE Energy Company (115)     (22)     (215) (83)  
Other Financial Data                  
Investments in equity method investees 22           22   23
Capital expenditures and acquisitions             0   0
Goodwill 0           0   0
Total Assets 6,043           6,043   4,723
Reclassifications and Eliminations                  
Segment Reporting Information [Line Items]                  
Operating Revenues — Utility operations (23)     (22)     (65) (64)  
Operating Revenues — Non-utility operations (52)     (29)     (195) (93)  
Depreciation and amortization 0     0     0 0  
Interest expense (18)     (14)     (60) (45)  
Interest income 18     14     60 45  
Equity earnings of equity method investees 0     0     0 0  
Other segment items (pre-tax) (75)     (51)     (260) (157)  
Income Tax Expense (Benefit) 0     0     0 0  
Net Income (Loss) Attributable to DTE Energy Company 0     $ 0     0 0  
Other Financial Data                  
Investments in equity method investees 0           0   0
Capital expenditures and acquisitions             0   0
Goodwill 0           0   0
Total Assets (4,341)           (4,341)   $ (2,975)
Reclassifications and Eliminations | Electric                  
Segment Reporting Information [Line Items]                  
Operating Revenues — Non-utility operations $ (1)           $ (3) $ (2)