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Fair Value (Fair Value of Financial Instruments) (Details) - USD ($)
$ in Millions
Jun. 30, 2020
Dec. 31, 2019
Carrying amount    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Notes receivable — Other, excluding lessor finance leases $ 78 $ 184
Short-term borrowings 914 828
Notes payable — Other 15 25
Long-term debt 17,997 16,606
Carrying amount | DTE Electric    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Notes receivable — Other, excluding lessor finance leases 11 9
Short-term borrowings 200 354
Notes payable — Other 11 21
Long-term debt 8,566 7,180
Carrying amount | DTE Electric | Affiliates    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Short-term borrowings 107 97
Fair value | Level 1    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Notes receivable — Other, excluding lessor finance leases 0 0
Short-term borrowings 0 0
Notes payable — Other 0 0
Long-term debt 2,299 2,572
Fair value | Level 1 | DTE Electric    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Notes receivable — Other, excluding lessor finance leases 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, excluding lessor finance leases 0 0
Short-term borrowings 914 828
Notes payable — Other 0 0
Long-term debt 15,952 14,207
Fair value | Level 2 | DTE Electric    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Notes receivable — Other, excluding lessor finance leases 0 0
Short-term borrowings 200 354
Notes payable — Other 0 0
Long-term debt 9,821 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, excluding lessor finance leases 78 184
Short-term borrowings 0 0
Notes payable — Other 15 25
Long-term debt 1,845 1,252
Fair value | Level 3 | DTE Electric    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Notes receivable — Other, excluding lessor finance leases 11 9
Short-term borrowings 0 0
Notes payable — Other 11 21
Long-term debt 193 173
Fair value | Level 3 | DTE Electric | Affiliates    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Short-term borrowings $ 107 $ 97