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Fair Value (Reconciliation of Level 3 Assets and Liabilities at Fair Value on a Recurring Basis) (Details) - Recurring - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]    
Net Assets (Liabilities) as of beginning of period $ (2) $ 4
Transfers from Level 3 into Level 2 0 (1)
Total gains (losses)    
Included in earnings (41) 44
Recorded in Regulatory liabilities (1) (2)
Purchases, issuances, and settlements    
Settlements (63) (21)
Net Assets (Liabilities) as of end of period (107) 24
Total gains (losses) included in Net Income attributed to the change in unrealized gains (losses) related to assets and liabilities held at March 31 (100) 40
DTE Electric    
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]    
Net Assets (Liabilities) as of beginning of period 4 3
Total gains (losses)    
Recorded in Regulatory liabilities (1) (2)
Purchases, issuances, and settlements    
Settlements (2) 0
Net Assets (Liabilities) as of end of period 1 1
Natural gas    
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]    
Net Assets (Liabilities) as of beginning of period (16) (15)
Transfers from Level 3 into Level 2 0 (1)
Total gains (losses)    
Included in earnings (67) 24
Recorded in Regulatory liabilities 0 0
Purchases, issuances, and settlements    
Settlements (6) 0
Net Assets (Liabilities) as of end of period (89) 8
Total gains (losses) included in Net Income attributed to the change in unrealized gains (losses) related to assets and liabilities held at March 31 (93) 19
Electricity    
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]    
Net Assets (Liabilities) as of beginning of period 10 16
Transfers from Level 3 into Level 2 0 0
Total gains (losses)    
Included in earnings 26 20
Recorded in Regulatory liabilities 0 0
Purchases, issuances, and settlements    
Settlements (55) (21)
Net Assets (Liabilities) as of end of period (19) 15
Total gains (losses) included in Net Income attributed to the change in unrealized gains (losses) related to assets and liabilities held at March 31 (7) 21
Other    
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]    
Net Assets (Liabilities) as of beginning of period 4 3
Transfers from Level 3 into Level 2 0 0
Total gains (losses)    
Included in earnings 0 0
Recorded in Regulatory liabilities (1) (2)
Purchases, issuances, and settlements    
Settlements (2) 0
Net Assets (Liabilities) as of end of period 1 1
Total gains (losses) included in Net Income attributed to the change in unrealized gains (losses) related to assets and liabilities held at March 31 $ 0 $ 0