Short-Term Credit Arrangements and Borrowings (Details Textuals)	Dec. 31, 2015 USD ($)	Dec. 31, 2014 USD ($)
Short-term Debt [Line Items]
Other outstanding letters of credit	$ 629,000,000
Weighted average interest rate	0.60%	0.40%
Dividend restriction	$ 920,000,000
Retained earnings	4,794,000,000	$ 4,578,000,000
Effective limitations	$ 0
Maximum
Short-term Debt [Line Items]
Total funded debt to capitalization ratio	0.65
DTE Energy
Short-term Debt [Line Items]
Total funded debt to capitalization ratio	0.51
Other outstanding letters of credit	$ 163,000,000
DTE Electric
Short-term Debt [Line Items]
Total funded debt to capitalization ratio	0.51
Other outstanding letters of credit	$ 272,000,000
Weighted average interest rate	0.70%	0.50%
Retained earnings	$ 1,585,000,000	$ 1,436,000,000
DTE Gas
Short-term Debt [Line Items]
Total funded debt to capitalization ratio	0.48
Letter of Credit
Short-term Debt [Line Items]
Other outstanding letters of credit	$ 130,000,000
Letter of Credit | DTE Energy
Short-term Debt [Line Items]
Other outstanding letters of credit	130,000,000
Letter of Credit | DTE Electric
Short-term Debt [Line Items]
Other outstanding letters of credit	0
Demand Financing Agreement | DTE Energy
Short-term Debt [Line Items]
Maximum borrowing capacity	100,000,000
Additional margin financing	50,000,000
Amount outstanding	103,000,000	$ 37,000,000
Demand Financing Agreement Plus Letter of Credit | DTE Energy
Short-term Debt [Line Items]
Maximum borrowing capacity	125,000,000
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	$ 25,000,000