Short-Term Credit Arrangements and Borrowings (Details)	Dec. 31, 2018 USD ($)	Dec. 31, 2017 USD ($)
Short-term Debt [Line Items]
Other outstanding letters of credit	$ 777,000,000
Weighted average interest rate	2.90%	1.90%
Dividend restriction	$ 2,400,000,000
Retained earnings	6,112,000,000	$ 5,643,000,000
Effective limitations	0
Letters of credit
Short-term Debt [Line Items]
Other outstanding letters of credit	$ 168,000,000
DTE Electric
Short-term Debt [Line Items]
Total funded debt to capitalization ratio	0.50
Other outstanding letters of credit	$ 149,000,000
Weighted average interest rate	2.90%	1.50%
Retained earnings	$ 2,162,000,000	$ 1,956,000,000
DTE Electric | Letters of credit
Short-term Debt [Line Items]
Other outstanding letters of credit	$ 0
DTE Gas
Short-term Debt [Line Items]
Total funded debt to capitalization ratio	0.48
Other outstanding letters of credit	$ 189,000,000
DTE Gas | Letters of credit
Short-term Debt [Line Items]
Other outstanding letters of credit	$ 0
DTE Energy
Short-term Debt [Line Items]
Total funded debt to capitalization ratio	0.55
Other outstanding letters of credit	$ 439,000,000
DTE Energy | Letters of credit
Short-term Debt [Line Items]
Other outstanding letters of credit	168,000,000
DTE Energy | Demand financing agreement
Short-term Debt [Line Items]
Maximum borrowing capacity	100,000,000
Additional margin financing	50,000,000
Amount outstanding	93,000,000	$ 56,000,000
DTE Energy | Demand financing agreement plus letter of credit
Short-term Debt [Line Items]
Maximum borrowing capacity	125,000,000
DTE Energy | Other outstanding letters of credit | Letters of credit
Short-term Debt [Line Items]
Other outstanding letters of credit	$ 9,000,000
Maximum
Short-term Debt [Line Items]
Total funded debt to capitalization ratio	0.65