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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 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 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 $ (19) $ (23) $ (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) 15 (93) 58
Recorded in/Change in fair value recorded in Regulatory liabilities 15 11 15 13
Purchases, issuances, and settlements        
Settlements (10) (9) 67 11
Net Assets (Liabilities) as of end of period (23) (6) (23) (6)
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 June 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 (18) 0 (86) 32
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 5 1 9 2
Total gains (losses):        
Recorded in/Change in fair value recorded in Regulatory liabilities 15 11 15 13
Purchases, issuances, and settlements        
Settlements (5) (4) (9) (7)
Net Assets (Liabilities) as of end of period 15 8 15 8
The amount of total gains (losses) included in Regulatory liabilities attributed to the change in unrealized gains (losses) related to assets held at June 30, 2018 and 2017 and reflected in DTE Electric's Consolidated Statements of Financial Position 15 8 15 8
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 (10) (15) (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 (28) (6) (98) 46
Recorded in/Change in fair value recorded in Regulatory liabilities 0 0 0 0
Purchases, issuances, and settlements        
Settlements 13 4 105 33
Net Assets (Liabilities) as of end of period (25) (17) (25) (17)
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 June 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 (20) (20) (78) 16
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 18 21 4 11
Recorded in/Change in fair value recorded in Regulatory liabilities 0 0 0 0
Purchases, issuances, and settlements        
Settlements (18) (9) (29) (14)
Net Assets (Liabilities) as of end of period (13) 6 (13) 6
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 June 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 4 20 (6) 17
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 (2) 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 1 0 1 1
Recorded in/Change in fair value recorded in Regulatory liabilities 15 11 15 13
Purchases, issuances, and settlements        
Settlements (5) (4) (9) (8)
Net Assets (Liabilities) as of end of period 15 5 15 5
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 June 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 $ (2) $ 0 $ (2) $ (1)