v3.25.2
Fair Value (Carrying Amount of Fair Value of Financial Instruments) (Details) - USD ($)
$ in Millions
Jun. 30, 2025
Dec. 31, 2024
Carrying amount    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Notes receivable $ 1,050 $ 884
Short-term borrowings 597 1,067
Notes payable 43 37
Long-term debt 23,165 21,963
Carrying amount | DTE Electric    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Notes payable 27 35
Long-term debt 12,787 11,881
Carrying amount | DTE Electric | Affiliates    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Notes receivable 0 42
Short-term borrowings 120 0
Carrying amount | DTE Electric | Other    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Notes receivable 41 2
Short-term borrowings 597 666
Fair Value | Level 1    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Notes receivable 0 0
Short-term borrowings 0 0
Notes payable 0 0
Long-term debt 685 725
Fair Value | Level 1 | DTE Electric    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Notes payable 0 0
Long-term debt 0 0
Fair Value | Level 1 | DTE Electric | Affiliates    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Notes receivable 0 0
Short-term borrowings 0 0
Fair Value | Level 1 | DTE Electric | Other    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Notes receivable 0 0
Short-term borrowings 0 0
Fair Value | Level 2    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Notes receivable 0 0
Short-term borrowings 597 1,067
Notes payable 0 0
Long-term debt 19,880 18,283
Fair Value | Level 2 | DTE Electric    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Notes payable 0 0
Long-term debt 11,573 10,449
Fair Value | Level 2 | DTE Electric | Affiliates    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Notes receivable 0 0
Short-term borrowings 0 0
Fair Value | Level 2 | DTE Electric | Other    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Notes receivable 0 0
Short-term borrowings 597 666
Fair Value | Level 3    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Notes receivable 1,067 904
Short-term borrowings 0 0
Notes payable 43 37
Long-term debt 1,144 1,128
Fair Value | Level 3 | DTE Electric    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Notes payable 27 35
Long-term debt 131 127
Fair Value | Level 3 | DTE Electric | Affiliates    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Notes receivable 0 42
Short-term borrowings 120 0
Fair Value | Level 3 | DTE Electric | Other    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Notes receivable 41 2
Short-term borrowings $ 0 $ 0