Short-Term Credit Arrangements and Borrowings (Details Textuals)	Dec. 31, 2016 USD ($)	Dec. 31, 2015 USD ($)
Short-term Debt [Line Items]
Other outstanding letters of credit	$ 653,000,000
Weighted average interest rate	0.90%	0.60%
Dividend restriction	$ 1,500,000,000
Retained earnings	5,114,000,000	$ 4,794,000,000
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	0.53
Other outstanding letters of credit	$ 411,000,000
DTE Electric
Short-term Debt [Line Items]
Total funded debt to capitalization ratio	0.50
Other outstanding letters of credit	$ 62,000,000
Weighted average interest rate	0.80%	0.70%
Retained earnings	$ 1,787,000,000	$ 1,585,000,000
DTE Gas
Short-term Debt [Line Items]
Total funded debt to capitalization ratio	0.46
Letters of credit
Short-term Debt [Line Items]
Other outstanding letters of credit	$ 154,000,000
Letters of credit | DTE Energy
Short-term Debt [Line Items]
Other outstanding letters of credit	154,000,000
Letters 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	50,000,000	$ 103,000,000
Demand financing agreement plus letter of credit | DTE Energy
Short-term Debt [Line Items]
Maximum borrowing capacity	135,000,000
Other outstanding letters of credit | Letters of credit | DTE Energy
Short-term Debt [Line Items]
Other outstanding letters of credit	17,000,000
Demand financing agreement | Letters of credit | DTE Energy
Short-term Debt [Line Items]
Maximum borrowing capacity	$ 35,000,000