Short-Term Credit Arrangements and Borrowings (Details Textuals)	Mar. 31, 2016 USD ($)	Dec. 31, 2015 USD ($)
Short-term Debt [Line Items]
Other outstanding letters of credit	$ 532,000,000
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	0.50
Other outstanding letters of credit	$ 238,000,000
DTE Electric
Short-term Debt [Line Items]
Ratio of indebtedness to net capital	0.51
Other outstanding letters of credit	$ 211,000,000
DTE Gas
Short-term Debt [Line Items]
Ratio of indebtedness to net capital	0.47
Other outstanding letters of credit	$ 83,000,000
Letter of Credit
Short-term Debt [Line Items]
Other outstanding letters of credit	167,000,000
Letter of Credit | DTE Energy
Short-term Debt [Line Items]
Other outstanding letters of credit	167,000,000
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	106,000,000	$ 103,000,000
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