Short-Term Credit Arrangements and Borrowings (Details Textuals)	Dec. 31, 2020 USD ($)	Dec. 31, 2020 CAD ($)	Nov. 30, 2020 USD ($)	Jul. 31, 2020 USD ($)	May 31, 2020 CAD ($)	Dec. 31, 2019 USD ($)
Short-term Debt [Line Items]
Face amount	$ 3,730,000,000
Short-term borrowings	38,000,000					$ 828,000,000
Maximum borrowing capacity	2,846,000,000
Other outstanding letters of credit	$ 231,000,000
Weighted average interest rate	1.10%	1.10%				2.00%
Dividend restriction	$ 2,800,000,000
Retained earnings	7,156,000,000					$ 6,587,000,000
Effective limitations	0
Revolving credit facility
Short-term Debt [Line Items]
Other outstanding letters of credit	38,000,000
Letters of credit
Short-term Debt [Line Items]
Other outstanding letters of credit	193,000,000
Unsecured term loan, expiring in November 2021 | Letters of credit
Short-term Debt [Line Items]
Maximum borrowing capacity	200,000,000
Unsecured Canadian revolving credit facility, expiring May 2023 | Revolving credit facility
Short-term Debt [Line Items]
Maximum borrowing capacity	86,000,000
DTE Electric
Short-term Debt [Line Items]
Maximum borrowing capacity	700,000,000
Other outstanding letters of credit	$ 0
Total funded debt to capitalization ratio	0.51	0.51
Weighted average interest rate						1.90%
Retained earnings	$ 2,623,000,000					$ 2,384,000,000
DTE Electric | Revolving credit facility
Short-term Debt [Line Items]
Other outstanding letters of credit	0
DTE Electric | Letters of credit
Short-term Debt [Line Items]
Other outstanding letters of credit	0
DTE Electric | Unsecured term loan, expiring in November 2021 | Unsecured
Short-term Debt [Line Items]
Face amount			$ 200,000,000
Short-term borrowings	0
DTE Electric | Unsecured term loan, expiring in November 2021 | Letters of credit
Short-term Debt [Line Items]
Maximum borrowing capacity	200,000,000
DTE Electric | Unsecured Canadian revolving credit facility, expiring May 2023 | Revolving credit facility
Short-term Debt [Line Items]
Maximum borrowing capacity	0
DTE Gas
Short-term Debt [Line Items]
Maximum borrowing capacity	300,000,000
Other outstanding letters of credit	$ 0
Total funded debt to capitalization ratio	0.48	0.48
DTE Gas | Revolving credit facility
Short-term Debt [Line Items]
Other outstanding letters of credit	$ 0
DTE Gas | Letters of credit
Short-term Debt [Line Items]
Other outstanding letters of credit	0
DTE Gas | Unsecured term loan, expiring in November 2021 | Letters of credit
Short-term Debt [Line Items]
Maximum borrowing capacity	0
DTE Gas | Unsecured Canadian revolving credit facility, expiring May 2023 | Revolving credit facility
Short-term Debt [Line Items]
Maximum borrowing capacity	0
DTE Lake Erie Generation, Inc | Unsecured Canadian revolving credit facility, expiring May 2023 | Revolving credit facility
Short-term Debt [Line Items]
Maximum borrowing capacity					$ 110,000,000
Other outstanding letters of credit		$ 49,000,000
DTE Energy
Short-term Debt [Line Items]
Maximum borrowing capacity	1,846,000,000
Other outstanding letters of credit	$ 231,000,000
Total funded debt to capitalization ratio	0.59	0.59
DTE Energy | Revolving credit facility
Short-term Debt [Line Items]
Other outstanding letters of credit	$ 38,000,000
DTE Energy | Letters of credit
Short-term Debt [Line Items]
Other outstanding letters of credit	193,000,000
DTE Energy | Demand financing agreement
Short-term Debt [Line Items]
Maximum borrowing capacity	300,000,000
Amount outstanding	49,000,000					$ 114,000,000
DTE Energy | Unsecured term loan, expiring in November 2021 | Letters of credit
Short-term Debt [Line Items]
Maximum borrowing capacity	0
DTE Energy | Unsecured Canadian revolving credit facility, expiring May 2023 | Revolving credit facility
Short-term Debt [Line Items]
Maximum borrowing capacity	86,000,000
DTE Energy | Other outstanding letters of credit | Letters of credit
Short-term Debt [Line Items]
Other outstanding letters of credit	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	100,000,000
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	$ 150,000,000
Maximum
Short-term Debt [Line Items]
Total funded debt to capitalization ratio	0.65	0.65