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Fair Value (Reconciliation of Level 3 Assets and Liabilities at Fair Value on a Recurring Basis) (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Purchases, issuances, and settlements:    
Issuances $ 0 $ 0
Natural Gas    
Purchases, issuances, and settlements:    
Issuances 0 0
Electricity    
Purchases, issuances, and settlements:    
Issuances 0 0
Other    
Purchases, issuances, and settlements:    
Issuances 0 0
Recurring    
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]    
Net Assets (Liabilities) as of January 1 (9) (88)
Transfers into Level 3 from Level 2 0 0
Transfers from Level 3 into Level 2 (3) 0
Total gains (losses)    
Included in earnings (116) 82
Recorded in Regulatory liabilities 9 25
Purchases, issuances, and settlements:    
Purchases 0 0
Settlements 75 (28)
Net Assets (Liabilities) as of December 31 (44) (9)
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 December 31, 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 (120) 21
Recurring | Natural Gas    
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]    
Net Assets (Liabilities) as of January 1 (29) (96)
Transfers into Level 3 from Level 2 0 0
Transfers from Level 3 into Level 2 (3) 0
Total gains (losses)    
Included in earnings (146) (29)
Recorded in Regulatory liabilities 0 0
Purchases, issuances, and settlements:    
Purchases 0 0
Settlements 129 96
Net Assets (Liabilities) as of December 31 (49) (29)
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 December 31, 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 (119) (30)
Recurring | Electricity    
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]    
Net Assets (Liabilities) as of January 1 12 9
Transfers into Level 3 from Level 2 0 0
Transfers from Level 3 into Level 2 0 0
Total gains (losses)    
Included in earnings 29 109
Recorded in Regulatory liabilities 0 0
Purchases, issuances, and settlements:    
Purchases 0 0
Settlements (43) (106)
Net Assets (Liabilities) as of December 31 (2) 12
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 December 31, 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 15 50
Recurring | Other    
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]    
Net Assets (Liabilities) as of January 1 8 (1)
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 2
Recorded in Regulatory liabilities 9 25
Purchases, issuances, and settlements:    
Purchases 0 0
Settlements (11) (18)
Net Assets (Liabilities) as of December 31 7 8
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 December 31, 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 (16) 1
Recurring | DTE Electric    
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]    
Net Assets (Liabilities) as of January 1 9 2
Total gains (losses)    
Recorded in Regulatory liabilities 9 25
Purchases, issuances, and settlements:    
Settlements (12) (18)
Net Assets (Liabilities) as of December 31 6 9
The amount of total gains (losses) included in Regulatory liabilities attributed to the change in unrealized gains (losses) related to assets and liabilities held at December 31, 2018 and 2017 and reflected in DTE Electric's Consolidated Statements of Financial Position $ 6 $ 9