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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, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]        
Net Assets (Liabilities) as of beginning of period $ (23) $ (6) $ (9) $ (88)
Transfers into Level 3 from Level 2 0 0 0 0
Transfers from Level 3 into Level 2 0 0 (3) 0
Total gains (losses):        
Included in earnings (9) 26 (102) 84
Recorded in/Change in fair value recorded in Regulatory liabilities (8) 2 6 15
Purchases, issuances, and settlements        
Settlements (10) (15) 58 (4)
Net Assets (Liabilities) as of end of period (50) 7 (50) 7
The amount of total gains (losses) included in Net Income attributed to the change in unrealized gains (losses) related to assets and liabilities held at September 30, 2018 and 2017 and reflected in Operating Revenues — Non-utility operations and Fuel, purchased power, and gas — non-utility in DTE Energy's Consolidated Statements of Operations (22) 11 (108) 43
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 15 8 9 2
Total gains (losses):        
Recorded in/Change in fair value recorded in Regulatory liabilities (8) 2 6 15
Purchases, issuances, and settlements        
Settlements (1) (6) (9) (13)
Net Assets (Liabilities) as of end of period 6 4 6 4
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, 2018 and 2017 and reflected in DTE Electric's Consolidated Statements of Financial Position (2) 1 6 4
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 (25) (17) (29) (96)
Transfers into Level 3 from Level 2 0 0 0 0
Transfers from Level 3 into Level 2 0 0 (3) 0
Total gains (losses):        
Included in earnings (30) (8) (128) 38
Recorded in/Change in fair value recorded in Regulatory liabilities 0 0 0 0
Purchases, issuances, and settlements        
Settlements 9 23 114 56
Net Assets (Liabilities) as of end of period (46) (2) (46) (2)
The amount of total gains (losses) included in Net Income attributed to the change in unrealized gains (losses) related to assets and liabilities held at September 30, 2018 and 2017 and reflected in Operating Revenues — Non-utility operations and Fuel, purchased power, and gas — non-utility in DTE Energy's Consolidated Statements of Operations (31) (8) (109) 8
Electricity        
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]        
Net Assets (Liabilities) as of beginning of period (13) 6 12 9
Transfers into Level 3 from Level 2 0 0 0 0
Transfers from Level 3 into Level 2 0 0 0 0
Total gains (losses):        
Included in earnings 21 33 25 45
Recorded in/Change in fair value recorded in Regulatory liabilities 0 0 0 0
Purchases, issuances, and settlements        
Settlements (18) (32) (47) (47)
Net Assets (Liabilities) as of end of period (10) 7 (10) 7
The amount of total gains (losses) included in Net Income attributed to the change in unrealized gains (losses) related to assets and liabilities held at September 30, 2018 and 2017 and reflected in Operating Revenues — Non-utility operations and Fuel, purchased power, and gas — non-utility in DTE Energy's Consolidated Statements of Operations 10 18 4 35
Other        
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]        
Net Assets (Liabilities) as of beginning of period 15 5 8 (1)
Transfers into Level 3 from Level 2 0 0 0 0
Transfers from Level 3 into Level 2 0 0 0 0
Total gains (losses):        
Included in earnings 0 1 1 1
Recorded in/Change in fair value recorded in Regulatory liabilities (8) 2 6 15
Purchases, issuances, and settlements        
Settlements (1) (6) (9) (13)
Net Assets (Liabilities) as of end of period 6 2 6 2
The amount of total gains (losses) included in Net Income attributed to the change in unrealized gains (losses) related to assets and liabilities held at September 30, 2018 and 2017 and reflected in Operating Revenues — Non-utility operations and Fuel, purchased power, and gas — non-utility in DTE Energy's Consolidated Statements of Operations $ (1) $ 1 $ (3) $ 0