Short-Term Credit Arrangements and Borrowings (Details Textuals)	Jun. 30, 2015 USD ($)	Dec. 31, 2014 USD ($)
Short-term Debt [Line Items]
Other outstanding letters of credit	$ 170,000,000
Letter of Credit
Short-term Debt [Line Items]
Other outstanding letters of credit	$ 170,000,000
DTE Energy
Short-term Debt [Line Items]
Ratio of indebtedness to net capital	0.51
Other outstanding letters of credit	$ 170,000,000
DTE Energy | Letter of Credit
Short-term Debt [Line Items]
Other outstanding letters of credit	170,000,000
DTE Energy | Demand Financing Agreement
Short-term Debt [Line Items]
Maximum borrowing capacity, financing agreement	100,000,000
Maximum additional margin financing	50,000,000
Amount outstanding	63,000,000	$ 37,000,000
DTE Energy | Demand Financing Agreement Plus Letter of Credit
Short-term Debt [Line Items]
Maximum borrowing capacity, financing agreement	$ 125,000,000
DTE Electric
Short-term Debt [Line Items]
Ratio of indebtedness to net capital	0.50
Other outstanding letters of credit	$ 0
DTE Electric | Letter of Credit
Short-term Debt [Line Items]
Other outstanding letters of credit	$ 0
DTE Gas
Short-term Debt [Line Items]
Ratio of indebtedness to net capital	0.47
Other outstanding letters of credit	$ 0
DTE Gas | Letter of Credit
Short-term Debt [Line Items]
Other outstanding letters of credit	0
Other outstanding letters of credit | DTE Energy | Letter of Credit
Short-term Debt [Line Items]
Other outstanding letters of credit	34,000,000
Demand Financing Agreement | DTE Energy | Letter of Credit
Short-term Debt [Line Items]
Maximum borrowing capacity, financing agreement	$ 25,000,000
Maximum
Short-term Debt [Line Items]
Ratio of indebtedness to net capital	0.65