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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, 2019
Mar. 31, 2018
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]    
Net Assets (Liabilities) as of beginning of period $ (44) $ (9)
Transfers into Level 3 from Level 2 0 0
Transfers from Level 3 into Level 2 0 (3)
Total gains (losses):    
Included in earnings (1) 61
Recorded in/Change in fair value recorded in Regulatory liabilities (3) 0
Purchases, issuances, and settlements    
Settlements 15 (68)
Net Assets (Liabilities) as of end of period (33) (19)
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 March 31, 2019 and 2018 and reflected in Operating Revenues — Non-utility operations and Fuel, purchased power, and gas — non-utility in DTE Energy's Consolidated Statements of Operations (6) (68)
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 6 9
Total gains (losses):    
Recorded in/Change in fair value recorded in Regulatory liabilities (3) 0
Purchases, issuances, and settlements    
Settlements (1) (4)
Net Assets (Liabilities) as of end of period 2 5
The amount of total gains (losses) included in Regulatory liabilities attributed to the change in unrealized gains (losses) related to assets held at March 31, 2019 and 2018 and reflected in DTE Electric's Consolidated Statements of Financial Position 0 3
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 (49) (29)
Transfers into Level 3 from Level 2 0 0
Transfers from Level 3 into Level 2 0 (3)
Total gains (losses):    
Included in earnings 31 (70)
Recorded in/Change in fair value recorded in Regulatory liabilities 0 0
Purchases, issuances, and settlements    
Settlements 8 92
Net Assets (Liabilities) as of end of period (10) (10)
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 March 31, 2019 and 2018 and reflected in Operating Revenues — Non-utility operations and Fuel, purchased power, and gas — non-utility in DTE Energy's Consolidated Statements of Operations 16 (58)
Electricity    
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]    
Net Assets (Liabilities) as of beginning of period (2) 12
Transfers into Level 3 from Level 2 0 0
Transfers from Level 3 into Level 2 0 0
Total gains (losses):    
Included in earnings (31) 131
Recorded in/Change in fair value recorded in Regulatory liabilities 0 0
Purchases, issuances, and settlements    
Settlements 8 (156)
Net Assets (Liabilities) as of end of period (25) (13)
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 March 31, 2019 and 2018 and reflected in Operating Revenues — Non-utility operations and Fuel, purchased power, and gas — non-utility in DTE Energy's Consolidated Statements of Operations (21) (10)
Other    
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]    
Net Assets (Liabilities) as of beginning of period 7 8
Transfers into Level 3 from Level 2 0 0
Transfers from Level 3 into Level 2 0 0
Total gains (losses):    
Included in earnings (1) 0
Recorded in/Change in fair value recorded in Regulatory liabilities (3) 0
Purchases, issuances, and settlements    
Settlements (1) (4)
Net Assets (Liabilities) as of end of period 2 4
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 March 31, 2019 and 2018 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) $ 0