Short-Term Credit Arrangements and Borrowings (Details Textuals)	Sep. 30, 2021 USD ($)	Jun. 30, 2021	Dec. 31, 2020 USD ($)
DTE Electric
Short-term Debt [Line Items]
Ratio of indebtedness to net capital	0.51
DTE Gas
Short-term Debt [Line Items]
Ratio of indebtedness to net capital	0.46
DTE Energy
Short-term Debt [Line Items]
Ratio of indebtedness to net capital	0.66
DTE Energy | Demand financing agreement
Short-term Debt [Line Items]
Maximum borrowing capacity, financing agreement	$ 300,000,000
Amount outstanding	4,000,000		$ 49,000,000
DTE Energy | Demand financing agreement | Demand financing agreement, indefinite term
Short-term Debt [Line Items]
Maximum borrowing capacity, financing agreement	100,000,000
Maximum additional margin financing	50,000,000
DTE Energy | Demand financing agreement | Demand financing agreement, expiring in 2022
Short-term Debt [Line Items]
Maximum borrowing capacity, financing agreement	$ 150,000,000
Maximum
Short-term Debt [Line Items]
Ratio of indebtedness to net capital	0.70	0.65