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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 9 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2020
Sep. 30, 2019
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]        
Net Assets (Liabilities) as of beginning of period $ 46 $ 9 $ 4 $ (44)
Transfers from Level 3 into Level 2 (1) 0 (5) 0
Total gains (losses)        
Included in earnings (42) 2 39 42
Recorded in/Change in fair value recorded in Regulatory liabilities 9 (3) 21 3
Purchases, issuances, and settlements        
Settlements (39) (36) (86) (29)
Net Assets (Liabilities) as of end of period (27) (28) (27) (28)
Total gains (losses) included in Net Income attributed to the change in unrealized gains (losses) related to assets and liabilities held at September 30, 2020 and 2019 (47) (22) 16 6
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 10 9 3 6
Total gains (losses)        
Recorded in/Change in fair value recorded in Regulatory liabilities 9 (3) 21 3
Purchases, issuances, and settlements        
Settlements (12) (1) (17) (4)
Net Assets (Liabilities) as of end of period 7 5 7 5
The amount of total gains (losses) included in Regulatory liabilities attributed to the change in unrealized gains (losses) related to assets held at September 30, 2020 and 2019 and reflected in DTE Electric's Consolidated Statements of Financial Position 0 (1) 7 5
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 20 (10) (15) (49)
Transfers from Level 3 into Level 2 (1) 0 (5) 0
Total gains (losses)        
Included in earnings (80) (35) (44) (4)
Recorded in/Change in fair value recorded in Regulatory liabilities 0 0 0 0
Purchases, issuances, and settlements        
Settlements 22 4 25 12
Net Assets (Liabilities) as of end of period (39) (41) (39) (41)
Total gains (losses) included in Net Income attributed to the change in unrealized gains (losses) related to assets and liabilities held at September 30, 2020 and 2019 (57) (36) (20) (20)
Electricity        
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]        
Net Assets (Liabilities) as of beginning of period 16 10 16 (2)
Transfers from Level 3 into Level 2 0 0 0 0
Total gains (losses)        
Included in earnings 37 37 90 47
Recorded in/Change in fair value recorded in Regulatory liabilities 0 0 0 0
Purchases, issuances, and settlements        
Settlements (48) (39) (101) (37)
Net Assets (Liabilities) as of end of period 5 8 5 8
Total gains (losses) included in Net Income attributed to the change in unrealized gains (losses) related to assets and liabilities held at September 30, 2020 and 2019 11 15 53 32
Other        
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]        
Net Assets (Liabilities) as of beginning of period 10 9 3 7
Transfers from Level 3 into Level 2 0 0 0 0
Total gains (losses)        
Included in earnings 1 0 (7) (1)
Recorded in/Change in fair value recorded in Regulatory liabilities 9 (3) 21 3
Purchases, issuances, and settlements        
Settlements (13) (1) (10) (4)
Net Assets (Liabilities) as of end of period 7 5 7 5
Total gains (losses) included in Net Income attributed to the change in unrealized gains (losses) related to assets and liabilities held at September 30, 2020 and 2019 $ (1) $ (1) $ (17) $ (6)