v3.26.1
Segment and Related Information (Profit (Loss) Financial Data) (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2026
Mar. 31, 2026
Jun. 30, 2025
Mar. 31, 2025
Jun. 30, 2026
Jun. 30, 2025
Dec. 31, 2025
Segment Reporting [Line Items]              
Operating Revenues — Utility operations $ 2,044   $ 1,979   $ 4,667 $ 4,286  
Operating Revenues — Non-utility operations 1,325   1,440   3,843 3,573  
Depreciation and amortization 498   451   981 903  
Interest expense 301   256   594 506  
Interest income (33)   (25)   (64) (48)  
Equity earnings (losses) of equity method investees 4   4   7 11  
Other segment items (pre-tax) 2,358   2,503   6,562 5,830  
Income Tax Expense (Benefit) (41)   1   (99) (17)  
Net Income (Loss) Attributable to DTE Energy Company 282 $ 247 229 $ 445 529 674  
Other Financial Data              
Investments in equity method investees 112       112   $ 122
Capital expenditures and acquisitions         2,721   4,639
Goodwill 1,993       1,993   1,993
Total Assets 56,234       56,234   54,066
Operating segments              
Segment Reporting [Line Items]              
Operating Revenues — Utility operations 2,066   1,998   4,715 4,328  
Operating Revenues — Non-utility operations 1,377   1,497   3,982 3,716  
Depreciation and amortization 498   451   981 903  
Interest expense 204   180   399 355  
Interest income (34)   (29)   (66) (56)  
Equity earnings (losses) of equity method investees 4   5   7 12  
Other segment items (pre-tax) 2,427   2,575   6,744 6,008  
Income Tax Expense (Benefit) (16)   (26)   (19) 48  
Net Income (Loss) Attributable to DTE Energy Company 360   339   651 774  
Other Financial Data              
Investments in equity method investees 101       101   100
Capital expenditures and acquisitions         2,721   4,639
Goodwill 1,993       1,993   1,993
Total Assets 54,357       54,357   52,096
Operating segments | Electric segment              
Segment Reporting [Line Items]              
Operating Revenues — Utility operations 1,751   1,682   3,468 3,136  
Operating Revenues — Non-utility operations 24   4   51 9  
Depreciation and amortization 423   380   832 762  
Interest expense 159   138   306 271  
Interest income (4)   (2)   (7) (4)  
Equity earnings (losses) of equity method investees 0   0   0 0  
Other segment items (pre-tax) 937   862   1,926 1,688  
Income Tax Expense (Benefit) (10)   (10)   (26) (13)  
Net Income (Loss) Attributable to DTE Energy Company 270   318   488 441  
Other Financial Data              
Investments in equity method investees 4       4   4
Capital expenditures and acquisitions         2,341   3,892
Goodwill 1,208       1,208   1,208
Total Assets 41,614       41,614   39,370
Operating segments | Gas segment              
Segment Reporting [Line Items]              
Operating Revenues — Utility operations 315   316   1,247 1,192  
Operating Revenues — Non-utility operations 0   0   0 0  
Depreciation and amortization 59   55   117 109  
Interest expense 35   32   70 64  
Interest income (3)   (4)   (4) (6)  
Equity earnings (losses) of equity method investees 0   1   1 1  
Other segment items (pre-tax) 229   224   795 747  
Income Tax Expense (Benefit) (1)   2   62 65  
Net Income (Loss) Attributable to DTE Energy Company (4)   6   206 212  
Other Financial Data              
Investments in equity method investees 19       19   19
Capital expenditures and acquisitions         348   661
Goodwill 743       743   743
Total Assets 9,079       9,079   8,987
Operating segments | DTE Vantage segment              
Segment Reporting [Line Items]              
Operating Revenues — Utility operations 0   0   0 0  
Operating Revenues — Non-utility operations 200   169   427 357  
Depreciation and amortization 15   14   30 29  
Interest expense 7   8   14 16  
Interest income (26)   (21)   (51) (41)  
Equity earnings (losses) of equity method investees 4   4   6 11  
Other segment items (pre-tax) 176   146   487 293  
Income Tax Expense (Benefit) (21)   (13)   (45) (21)  
Net Income (Loss) Attributable to DTE Energy Company 45   31   (14) 70  
Other Financial Data              
Investments in equity method investees 78       78   77
Capital expenditures and acquisitions         30   80
Goodwill 25       25   25
Total Assets 2,588       2,588   2,426
Operating segments | Energy Trading segment              
Segment Reporting [Line Items]              
Operating Revenues — Utility operations 0   0   0 0  
Operating Revenues — Non-utility operations 1,153   1,324   3,504 3,350  
Depreciation and amortization 1   2   2 3  
Interest expense 3   2   9 4  
Interest income (1)   (2)   (4) (5)  
Equity earnings (losses) of equity method investees 0   0   0 0  
Other segment items (pre-tax) 1,085   1,343   3,536 3,280  
Income Tax Expense (Benefit) 16   (5)   (10) 17  
Net Income (Loss) Attributable to DTE Energy Company 49   (16)   (29) 51  
Other Financial Data              
Investments in equity method investees 0       0   0
Capital expenditures and acquisitions         2   6
Goodwill 17       17   17
Total Assets 1,076       1,076   1,313
Corporate and Other              
Segment Reporting [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 117   99   234 193  
Interest income (19)   (19)   (37) (34)  
Equity earnings (losses) of equity method investees 0   (1)   0 (1)  
Other segment items (pre-tax) 5   4   5 7  
Income Tax Expense (Benefit) (25)   27   (80) (65)  
Net Income (Loss) Attributable to DTE Energy Company (78)   (110)   (122) (100)  
Other Financial Data              
Investments in equity method investees 11       11   22
Capital expenditures and acquisitions         0   0
Goodwill 0       0   0
Total Assets 6,069       6,069   5,145
Reclassifications and Eliminations              
Segment Reporting [Line Items]              
Operating Revenues — Utility operations (22)   (19)   (48) (42)  
Operating Revenues — Non-utility operations (52)   (57)   (139) (143)  
Depreciation and amortization 0   0   0 0  
Interest expense (20)   (23)   (39) (42)  
Interest income 20   23   39 42  
Equity earnings (losses) of equity method investees 0   0   0 0  
Other segment items (pre-tax) (74)   (76)   (187) (185)  
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 (4,192)       (4,192)   $ (3,175)
Reclassifications and Eliminations | Electric segment              
Segment Reporting [Line Items]              
Operating Revenues — Non-utility operations $ (1)   $ (1)   $ (2) $ (2)