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Fair Value (Fair Value of Financial Instruments) (Details) - USD ($)
$ in Millions
Mar. 31, 2024
Dec. 31, 2023
Carrying amount    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Notes receivable $ 417 $ 175
Short-term borrowings 290 1,283
Notes payable 18 34
Long-term debt 21,633 19,546
Carrying amount | DTE Electric    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Notes receivable 16 19
Short-term borrowings 210 385
Notes payable 17 33
Long-term debt 11,938 11,043
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 814 807
Fair value | Level 1 | DTE Electric    
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 0 0
Fair value | Level 2    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Notes receivable 0 0
Short-term borrowings 290 1,283
Notes payable 0 0
Long-term debt 17,983 16,178
Fair value | Level 2 | DTE Electric    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Notes receivable 0 0
Short-term borrowings 210 385
Notes payable 0 0
Long-term debt 10,653 9,999
Fair value | Level 3    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Notes receivable 452 181
Short-term borrowings 0 0
Notes payable 18 34
Long-term debt 1,161 1,202
Fair value | Level 3 | DTE Electric    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Notes receivable 16 19
Short-term borrowings 0 0
Notes payable 17 33
Long-term debt $ 136 $ 126