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Fair Value (Fair Value of Financial Instruments) (Details) - USD ($)
$ in Millions
Sep. 30, 2024
Dec. 31, 2023
Carrying amount    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Notes receivable $ 463 $ 175
Short-term borrowings 966 1,283
Notes payable 15 34
Long-term debt 23,635 19,546
Carrying amount | DTE Electric    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Notes receivable 2 19
Notes payable 14 33
Long-term debt 11,899 11,043
Carrying amount | DTE Electric | Affiliates    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Short-term borrowings 142 0
Carrying amount | DTE Electric | Customer/ Other    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Short-term borrowings 798 385
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 828 807
Fair value | Level 1 | DTE Electric    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Notes receivable 0 0
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]    
Short-term borrowings 0 0
Fair value | Level 1 | DTE Electric | Customer/ Other    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
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 966 1,283
Notes payable 0 0
Long-term debt 20,724 16,178
Fair value | Level 2 | DTE Electric    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Notes receivable 0 0
Notes payable 0 0
Long-term debt 11,053 9,999
Fair value | Level 2 | DTE Electric | Affiliates    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Short-term borrowings 0 0
Fair value | Level 2 | DTE Electric | Customer/ Other    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Short-term borrowings 798 385
Fair value | Level 3    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Notes receivable 501 181
Short-term borrowings 0 0
Notes payable 15 34
Long-term debt 1,219 1,202
Fair value | Level 3 | DTE Electric    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Notes receivable 2 19
Notes payable 14 33
Long-term debt 142 126
Fair value | Level 3 | DTE Electric | Affiliates    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Short-term borrowings 142 0
Fair value | Level 3 | DTE Electric | Customer/ Other    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Short-term borrowings $ 0 $ 0