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Fair Value (Fair Value of Financial Instruments) (Details) - USD ($)
$ in Millions
Jun. 30, 2023
Dec. 31, 2022
Carrying amount    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Notes receivable $ 111 $ 80
Short-term borrowings 528 1,162
Notes payable 24 18
Long-term debt 19,221 17,978
Carrying amount | DTE Electric    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Notes receivable 2 17
Notes payable 23 17
Long-term debt 10,965 9,696
Carrying amount | DTE Electric | Affiliates    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Short-term borrowings 0 27
Carrying amount | DTE Electric | Other    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Short-term borrowings 222 568
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 817 710
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 | 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 528 1,162
Notes payable 0 0
Long-term debt 15,364 14,084
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 9,615 8,289
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 | Other    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Short-term borrowings 222 568
Fair value | Level 3    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Notes receivable 113 82
Short-term borrowings 0 0
Notes payable 24 18
Long-term debt 1,205 1,199
Fair value | Level 3 | DTE Electric    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Notes receivable 2 17
Notes payable 23 17
Long-term debt 133 128
Fair value | Level 3 | DTE Electric | Affiliates    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Short-term borrowings 0 27
Fair value | Level 3 | DTE Electric | Other    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Short-term borrowings $ 0 $ 0