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Fair Value (Fair Value of Financial Instruments) (Details) - USD ($)
$ in Millions
Sep. 30, 2020
Dec. 31, 2019
Carrying amount    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Notes receivable — Other $ 112 $ 184
Short-term borrowings 988 828
Notes payable — Other 19 25
Long-term debt 18,660 16,606
Carrying amount | DTE Electric    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Notes receivable — Other 18 9
Short-term borrowings 200 354
Notes payable — Other 17 21
Long-term debt 8,235 7,180
Carrying amount | DTE Electric | Affiliates    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Short-term borrowings 104 97
Fair value | Level 1    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Notes receivable — Other 0 0
Short-term borrowings 0 0
Notes payable — Other 0 0
Long-term debt 2,398 2,572
Fair value | Level 1 | DTE Electric    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Notes receivable — Other 0 0
Short-term borrowings 0 0
Notes payable — Other 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 2    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Notes receivable — Other 0 0
Short-term borrowings 988 828
Notes payable — Other 0 0
Long-term debt 17,213 14,207
Fair value | Level 2 | DTE Electric    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Notes receivable — Other 0 0
Short-term borrowings 200 354
Notes payable — Other 0 0
Long-term debt 9,565 7,916
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 3    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Notes receivable — Other 112 184
Short-term borrowings 0 0
Notes payable — Other 19 25
Long-term debt 1,406 1,252
Fair value | Level 3 | DTE Electric    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Notes receivable — Other 18 9
Short-term borrowings 0 0
Notes payable — Other 17 21
Long-term debt 194 173
Fair value | Level 3 | DTE Electric | Affiliates    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Short-term borrowings $ 104 $ 97