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Fair Value (Fair Value of Financial Instruments) (Details) - USD ($)
$ in Millions
Dec. 31, 2020
Dec. 31, 2019
Carrying Amount    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Notes receivable, excluding lessor finance leases $ 141 $ 184
Short-term borrowings 38 828
Notes payable 19 25
Long-term debt 19,439 16,606
Carrying Amount | DTE Electric    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Notes receivable, excluding lessor finance leases 16 9
Short-term borrowings 0 354
Notes payable 17 21
Long-term debt 8,236 7,180
Carrying Amount | DTE Electric | Affiliated entity    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Short-term borrowings 101 97
Fair Value | Level 1    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Notes receivable, excluding lessor finance leases 0 0
Short-term borrowings 0 0
Notes payable 0 0
Long-term debt 2,547 2,572
Fair Value | Level 1 | DTE Electric    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Notes receivable, excluding lessor finance leases 0 0
Short-term borrowings 0 0
Notes payable 0 0
Long-term debt 0 0
Fair Value | Level 1 | DTE Electric | Affiliated entity    
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, excluding lessor finance leases 0 0
Short-term borrowings 38 828
Notes payable 0 0
Long-term debt 18,230 14,207
Fair Value | Level 2 | DTE Electric    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Notes receivable, excluding lessor finance leases 0 0
Short-term borrowings 0 354
Notes payable 0 0
Long-term debt 9,579 7,916
Fair Value | Level 2 | DTE Electric | Affiliated entity    
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, excluding lessor finance leases 141 184
Short-term borrowings 0 0
Notes payable 19 25
Long-term debt 1,397 1,252
Fair Value | Level 3 | DTE Electric    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Notes receivable, excluding lessor finance leases 16 9
Short-term borrowings 0 0
Notes payable 17 21
Long-term debt 379 173
Fair Value | Level 3 | DTE Electric | Affiliated entity    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Short-term borrowings $ 101 $ 97