Short-Term Credit Arrangements and Borrowings (Details Textuals)	Mar. 31, 2017 USD ($)	Dec. 31, 2016 USD ($)
Short-term Debt [Line Items]
Other outstanding letters of credit	$ 198,000,000
Maximum
Short-term Debt [Line Items]
Ratio of indebtedness to net capital	0.65
DTE Energy
Short-term Debt [Line Items]
Ratio of indebtedness to net capital	0.53
Other outstanding letters of credit	$ 139,000,000
DTE Electric
Short-term Debt [Line Items]
Ratio of indebtedness to net capital	0.50
Other outstanding letters of credit	$ 59,000,000
DTE Gas
Short-term Debt [Line Items]
Ratio of indebtedness to net capital	0.45
Other outstanding letters of credit	$ 0
Letter of credit
Short-term Debt [Line Items]
Other outstanding letters of credit	139,000,000
Letter of credit | DTE Energy
Short-term Debt [Line Items]
Other outstanding letters of credit	139,000,000
Letter of credit | DTE Electric
Short-term Debt [Line Items]
Other outstanding letters of credit	0
Letter of credit | DTE Gas
Short-term Debt [Line Items]
Other outstanding letters of credit	0
Demand financing agreement | DTE Energy
Short-term Debt [Line Items]
Maximum borrowing capacity, financing agreement	100,000,000
Maximum additional margin financing	50,000,000
Amount outstanding	16,000,000	$ 50,000,000
Demand financing agreement plus letter of credit | DTE Energy
Short-term Debt [Line Items]
Maximum borrowing capacity, financing agreement	135,000,000
Other outstanding letters of credit | Letter of credit | DTE Energy
Short-term Debt [Line Items]
Other outstanding letters of credit	17,000,000
Demand financing agreement | Letter of credit | DTE Energy
Short-term Debt [Line Items]
Maximum borrowing capacity, financing agreement	$ 35,000,000