XML 117 R60.htm IDEA: XBRL DOCUMENT v3.20.1
Fair Value (Fair Value of Financial Instruments) (Details) - USD ($)
$ in Millions
Mar. 31, 2020
Dec. 31, 2019
Carrying amount    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Notes receivable — Other, excluding lessor finance leases $ 68 $ 184
Short-term borrowings 1,131 828
Notes payable — Other, excluding lessee finance leases 15 25
Long-term debt 17,398 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 71 354
Notes payable — Other, excluding lessee finance leases 11 21
Long-term debt 7,970 7,180
Carrying amount | DTE Electric | Affiliates    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Short-term borrowings 139 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, excluding lessee finance leases 0 0
Long-term debt 2,120 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, excluding lessee finance leases 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 1,131 828
Notes payable — Other, excluding lessee finance leases 0 0
Long-term debt 12,108 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 71 354
Notes payable — Other, excluding lessee finance leases 0 0
Long-term debt 7,373 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 68 184
Short-term borrowings 0 0
Notes payable — Other, excluding lessee finance leases 15 25
Long-term debt 3,824 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, excluding lessee finance leases 11 21
Long-term debt 1,330 173
Fair value | Level 3 | DTE Electric | Affiliates    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Short-term borrowings $ 139 $ 97