Short-Term Credit Arrangements and Borrowings (Details Textuals)	Sep. 30, 2019 USD ($)	Aug. 31, 2019 USD ($)	Jul. 31, 2019 USD ($)	Dec. 31, 2018 USD ($)
Short-term Debt [Line Items]
Maximum borrowing capacity	$ 2,560,000,000
Other outstanding letters of credit	915,000,000
Letter of credit
Short-term Debt [Line Items]
Other outstanding letters of credit	191,000,000
Unsecured letter of credit facility, expiring in August 2021 | Letter of credit
Short-term Debt [Line Items]
Maximum borrowing capacity	110,000,000
DTE Electric
Short-term Debt [Line Items]
Maximum borrowing capacity	$ 500,000,000
Ratio of indebtedness to net capital	0.52
Other outstanding letters of credit	$ 382,000,000
DTE Electric | Letter of credit
Short-term Debt [Line Items]
Other outstanding letters of credit	0
DTE Electric | Unsecured letter of credit facility, expiring in August 2021 | Letter of credit
Short-term Debt [Line Items]
Maximum borrowing capacity	0
DTE Gas
Short-term Debt [Line Items]
Maximum borrowing capacity	$ 300,000,000
Ratio of indebtedness to net capital	0.46
Other outstanding letters of credit	$ 232,000,000
DTE Gas | Letter of credit
Short-term Debt [Line Items]
Other outstanding letters of credit	0
DTE Gas | Unsecured letter of credit facility, expiring in August 2021 | Letter of credit
Short-term Debt [Line Items]
Maximum borrowing capacity	0
DTE Energy
Short-term Debt [Line Items]
Maximum borrowing capacity	$ 1,760,000,000
Ratio of indebtedness to net capital	0.57
Other outstanding letters of credit	$ 301,000,000
DTE Energy | Letter of credit
Short-term Debt [Line Items]
Other outstanding letters of credit	191,000,000
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	94,000,000			$ 93,000,000
DTE Energy | Demand financing agreement plus letter of credit
Short-term Debt [Line Items]
Maximum borrowing capacity, financing agreement	150,000,000
DTE Energy | Unsecured letter of credit facility, expiring in September 2019 | Letter of credit
Short-term Debt [Line Items]
Maximum borrowing capacity			$ 70,000,000
DTE Energy | Unsecured letter of credit facility, expiring in August 2021 | Letter of credit
Short-term Debt [Line Items]
Maximum borrowing capacity	110,000,000	$ 110,000,000
DTE Energy | Other outstanding letters of credit | Letter of credit
Short-term Debt [Line Items]
Other outstanding letters of credit	$ 9,000,000
Maximum
Short-term Debt [Line Items]
Ratio of indebtedness to net capital	0.65