Short-Term Credit Arrangements and Borrowings (Schedule of Borrowings) (Details) $ in Millions	Dec. 31, 2020 USD ($)
Line Of Credit Facility [Line Items]
Line of credit facility, maximum borrowing capacity	$ 2,846
Amounts outstanding	231
Net availability	2,615
DTE Electric
Line Of Credit Facility [Line Items]
Line of credit facility, maximum borrowing capacity	700
Amounts outstanding	0
Net availability	700
DTE Gas
Line Of Credit Facility [Line Items]
Line of credit facility, maximum borrowing capacity	300
Amounts outstanding	0
Net availability	300
DTE Energy
Line Of Credit Facility [Line Items]
Line of credit facility, maximum borrowing capacity	1,846
Amounts outstanding	231
Net availability	1,615
Letters of credit
Line Of Credit Facility [Line Items]
Amounts outstanding	193
Letters of credit | DTE Electric
Line Of Credit Facility [Line Items]
Amounts outstanding	0
Letters of credit | DTE Gas
Line Of Credit Facility [Line Items]
Amounts outstanding	0
Letters of credit | DTE Energy
Line Of Credit Facility [Line Items]
Amounts outstanding	193
Letters of credit | Unsecured letter of credit facility, expiring in February 2021
Line Of Credit Facility [Line Items]
Line of credit facility, maximum borrowing capacity	150
Letters of credit | Unsecured letter of credit facility, expiring in February 2021 | DTE Electric
Line Of Credit Facility [Line Items]
Line of credit facility, maximum borrowing capacity	0
Letters of credit | Unsecured letter of credit facility, expiring in February 2021 | DTE Gas
Line Of Credit Facility [Line Items]
Line of credit facility, maximum borrowing capacity	0
Letters of credit | Unsecured letter of credit facility, expiring in February 2021 | DTE Energy
Line Of Credit Facility [Line Items]
Line of credit facility, maximum borrowing capacity	150
Letters of credit | Unsecured letter of credit facility, expiring in August 2021
Line Of Credit Facility [Line Items]
Line of credit facility, maximum borrowing capacity	110
Letters of credit | Unsecured letter of credit facility, expiring in August 2021 | DTE Electric
Line Of Credit Facility [Line Items]
Line of credit facility, maximum borrowing capacity	0
Letters of credit | Unsecured letter of credit facility, expiring in August 2021 | DTE Gas
Line Of Credit Facility [Line Items]
Line of credit facility, maximum borrowing capacity	0
Letters of credit | Unsecured letter of credit facility, expiring in August 2021 | DTE Energy
Line Of Credit Facility [Line Items]
Line of credit facility, maximum borrowing capacity	110
Letters of credit | Unsecured term loan, expiring in November 2021
Line Of Credit Facility [Line Items]
Line of credit facility, maximum borrowing capacity	200
Letters of credit | Unsecured term loan, expiring in November 2021 | DTE Electric
Line Of Credit Facility [Line Items]
Line of credit facility, maximum borrowing capacity	200
Letters of credit | Unsecured term loan, expiring in November 2021 | DTE Gas
Line Of Credit Facility [Line Items]
Line of credit facility, maximum borrowing capacity	0
Letters of credit | Unsecured term loan, expiring in November 2021 | DTE Energy
Line Of Credit Facility [Line Items]
Line of credit facility, maximum borrowing capacity	0
Revolving credit facility
Line Of Credit Facility [Line Items]
Amounts outstanding	38
Revolving credit facility | DTE Electric
Line Of Credit Facility [Line Items]
Amounts outstanding	0
Revolving credit facility | DTE Gas
Line Of Credit Facility [Line Items]
Amounts outstanding	0
Revolving credit facility | DTE Energy
Line Of Credit Facility [Line Items]
Amounts outstanding	38
Revolving credit facility | Unsecured Canadian revolving credit facility, expiring May 2023
Line Of Credit Facility [Line Items]
Line of credit facility, maximum borrowing capacity	86
Revolving credit facility | Unsecured Canadian revolving credit facility, expiring May 2023 | DTE Electric
Line Of Credit Facility [Line Items]
Line of credit facility, maximum borrowing capacity	0
Revolving credit facility | Unsecured Canadian revolving credit facility, expiring May 2023 | DTE Gas
Line Of Credit Facility [Line Items]
Line of credit facility, maximum borrowing capacity	0
Revolving credit facility | Unsecured Canadian revolving credit facility, expiring May 2023 | DTE Energy
Line Of Credit Facility [Line Items]
Line of credit facility, maximum borrowing capacity	86
Revolving credit facility | Unsecured revolving credit facility, expiring April 2024
Line Of Credit Facility [Line Items]
Line of credit facility, maximum borrowing capacity	2,300
Revolving credit facility | Unsecured revolving credit facility, expiring April 2024 | DTE Electric
Line Of Credit Facility [Line Items]
Line of credit facility, maximum borrowing capacity	500
Revolving credit facility | Unsecured revolving credit facility, expiring April 2024 | DTE Gas
Line Of Credit Facility [Line Items]
Line of credit facility, maximum borrowing capacity	300
Revolving credit facility | Unsecured revolving credit facility, expiring April 2024 | DTE Energy
Line Of Credit Facility [Line Items]
Line of credit facility, maximum borrowing capacity	$ 1,500