Short-Term Credit Arrangements and Borrowings (Details Textuals)	1 Months Ended
	Sep. 30, 2015 USD ($)	Dec. 31, 2014 USD ($)
Short-term Debt [Line Items]
Maximum borrowing capacity	$ 2,070,000,000
Other outstanding letters of credit	$ 370,000,000
Maximum
Short-term Debt [Line Items]
Ratio of indebtedness to net capital	0.65
Letter of Credit
Short-term Debt [Line Items]
Other outstanding letters of credit	$ 185,000,000
DTE Energy
Short-term Debt [Line Items]
Maximum borrowing capacity	$ 1,370,000,000
Ratio of indebtedness to net capital	0.50
Other outstanding letters of credit	$ 196,000,000
DTE Energy | Letter of Credit
Short-term Debt [Line Items]
Other outstanding letters of credit	185,000,000
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	70,000,000	$ 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]
Maximum borrowing capacity	$ 400,000,000
Ratio of indebtedness to net capital	0.50
Other outstanding letters of credit	$ 46,000,000
DTE Electric | Letter of Credit
Short-term Debt [Line Items]
Other outstanding letters of credit	0
DTE Gas
Short-term Debt [Line Items]
Maximum borrowing capacity	$ 300,000,000
Ratio of indebtedness to net capital	0.48
Other outstanding letters of credit	$ 128,000,000
DTE Gas | Letter of Credit
Short-term Debt [Line Items]
Other outstanding letters of credit	0
Unsecured letter of credit facility, expiring in September 2017 | Letter of Credit
Short-term Debt [Line Items]
Maximum borrowing capacity	$ 70,000,000
Term of debt, years	2 years
Unsecured letter of credit facility, expiring in September 2017 | DTE Energy | Letter of Credit
Short-term Debt [Line Items]
Maximum borrowing capacity	$ 70,000,000
Unsecured letter of credit facility, expiring in September 2017 | DTE Electric | Letter of Credit
Short-term Debt [Line Items]
Maximum borrowing capacity	0
Unsecured letter of credit facility, expiring in September 2017 | DTE Gas | Letter of Credit
Short-term Debt [Line Items]
Maximum borrowing capacity	0
Other outstanding letters of credit | DTE Energy | Letter of Credit
Short-term Debt [Line Items]
Other outstanding letters of credit	20,000,000
Demand Financing Agreement | DTE Energy | Letter of Credit
Short-term Debt [Line Items]
Maximum borrowing capacity, financing agreement	$ 25,000,000