Short-Term Credit Arrangements and Borrowings (Details Textuals)	Mar. 31, 2021 USD ($)	Dec. 31, 2020 USD ($)	Jul. 31, 2020 USD ($)
Short-term Debt [Line Items]
Amounts outstanding	$ 264,000,000
Maximum borrowing capacity	2,848,000,000
Letters of credit
Short-term Debt [Line Items]
Amounts outstanding	$ 212,000,000
DTE Electric
Short-term Debt [Line Items]
Ratio of indebtedness to net capital	0.53
Amounts outstanding	$ 0
Maximum borrowing capacity	700,000,000
DTE Electric | Letters of credit
Short-term Debt [Line Items]
Amounts outstanding	$ 0
DTE Gas
Short-term Debt [Line Items]
Ratio of indebtedness to net capital	0.47
Amounts outstanding	$ 0
Maximum borrowing capacity	300,000,000
DTE Gas | Letters of credit
Short-term Debt [Line Items]
Amounts outstanding	$ 0
DTE Energy
Short-term Debt [Line Items]
Ratio of indebtedness to net capital	0.60
Amounts outstanding	$ 264,000,000
Maximum borrowing capacity	1,848,000,000
DTE Energy | Letters of credit
Short-term Debt [Line Items]
Amounts outstanding	212,000,000
DTE Energy | Demand financing agreement
Short-term Debt [Line Items]
Maximum borrowing capacity, financing agreement	300,000,000
Amount outstanding	74,000,000	$ 49,000,000
DTE Energy | Other outstanding letters of credit | Letters of credit
Short-term Debt [Line Items]
Amounts outstanding	59,000,000
DTE Energy | Uncommitted letter of credit facility, Expiring July 2021 | Letters of credit
Short-term Debt [Line Items]
Maximum borrowing capacity			$ 50,000,000
DTE Energy | Demand financing agreement, indefinite term | Demand financing agreement
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, expiring in 2022 | Demand financing agreement
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	0.65