Short-Term Credit Arrangements and Borrowings (Details)	Sep. 30, 2020 USD ($)
Availability under combined facilities
Maximum borrowing capacity	$ 3,810,000,000
Amounts outstanding	1,200,000,000
Net availability	2,610,000,000
DTE Electric
Availability under combined facilities
Maximum borrowing capacity	900,000,000
Amounts outstanding	200,000,000
Net availability	700,000,000
DTE Gas
Availability under combined facilities
Maximum borrowing capacity	400,000,000
Amounts outstanding	100,000,000
Net availability	300,000,000
DTE Energy
Availability under combined facilities
Maximum borrowing capacity	2,510,000,000
Amounts outstanding	900,000,000
Net availability	1,610,000,000
Letters of credit
Availability under combined facilities
Amounts outstanding	212,000,000
Letters of credit | DTE Electric
Availability under combined facilities
Amounts outstanding	0
Letters of credit | DTE Gas
Availability under combined facilities
Amounts outstanding	0
Letters of credit | DTE Energy
Availability under combined facilities
Amounts outstanding	212,000,000
Unsecured term loan
Availability under combined facilities
Amounts outstanding	967,000,000
Unsecured term loan | DTE Electric
Availability under combined facilities
Amounts outstanding	200,000,000
Unsecured term loan | DTE Gas
Availability under combined facilities
Amounts outstanding	100,000,000
Unsecured term loan | DTE Energy
Availability under combined facilities
Amounts outstanding	667,000,000
Revolver borrowings
Availability under combined facilities
Amounts outstanding	21,000,000
Revolver borrowings | DTE Electric
Availability under combined facilities
Amounts outstanding	0
Revolver borrowings | DTE Gas
Availability under combined facilities
Amounts outstanding	0
Revolver borrowings | DTE Energy
Availability under combined facilities
Amounts outstanding	21,000,000
Unsecured letter of credit facility, expiring in February 2021 | Letters of credit
Availability under combined facilities
Maximum borrowing capacity	150,000,000
Unsecured letter of credit facility, expiring in February 2021 | Letters of credit | DTE Electric
Availability under combined facilities
Maximum borrowing capacity	0
Unsecured letter of credit facility, expiring in February 2021 | Letters of credit | DTE Gas
Availability under combined facilities
Maximum borrowing capacity	0
Unsecured letter of credit facility, expiring in February 2021 | Letters of credit | DTE Energy
Availability under combined facilities
Maximum borrowing capacity	150,000,000
Unsecured letter of credit facility, expiring in August 2021 | Letters of credit
Availability under combined facilities
Maximum borrowing capacity	110,000,000
Unsecured letter of credit facility, expiring in August 2021 | Letters of credit | DTE Electric
Availability under combined facilities
Maximum borrowing capacity	0
Unsecured letter of credit facility, expiring in August 2021 | Letters of credit | DTE Gas
Availability under combined facilities
Maximum borrowing capacity	0
Unsecured letter of credit facility, expiring in August 2021 | Letters of credit | DTE Energy
Availability under combined facilities
Maximum borrowing capacity	110,000,000
Unsecured term loan, expiring in March 2021 | Unsecured term loan
Availability under combined facilities
Maximum borrowing capacity	500,000,000
Unsecured term loan, expiring in March 2021 | Unsecured term loan | DTE Electric
Availability under combined facilities
Maximum borrowing capacity	0
Unsecured term loan, expiring in March 2021 | Unsecured term loan | DTE Gas
Availability under combined facilities
Maximum borrowing capacity	0
Unsecured term loan, expiring in March 2021 | Unsecured term loan | DTE Energy
Availability under combined facilities
Maximum borrowing capacity	500,000,000
Unsecured term loans, expiring in April 2021 | Unsecured term loan
Availability under combined facilities
Maximum borrowing capacity	500,000,000
Unsecured term loans, expiring in April 2021 | Unsecured term loan | DTE Electric
Availability under combined facilities
Maximum borrowing capacity	400,000,000
Unsecured term loans, expiring in April 2021 | Unsecured term loan | DTE Gas
Availability under combined facilities
Maximum borrowing capacity	100,000,000
Unsecured term loans, expiring in April 2021 | Unsecured term loan | DTE Energy
Availability under combined facilities
Maximum borrowing capacity	0
Unsecured term loan, expiring in June 2021 | Unsecured term loan
Availability under combined facilities
Maximum borrowing capacity	167,000,000
Unsecured term loan, expiring in June 2021 | Unsecured term loan | DTE Electric
Availability under combined facilities
Maximum borrowing capacity	0
Unsecured term loan, expiring in June 2021 | Unsecured term loan | DTE Gas
Availability under combined facilities
Maximum borrowing capacity	0
Unsecured term loan, expiring in June 2021 | Unsecured term loan | DTE Energy
Availability under combined facilities
Maximum borrowing capacity	167,000,000
Unsecured Canadian revolving credit facility, expiring May 2023 | Revolver borrowings
Availability under combined facilities
Maximum borrowing capacity	83,000,000
Unsecured Canadian revolving credit facility, expiring May 2023 | Revolver borrowings | DTE Electric
Availability under combined facilities
Maximum borrowing capacity	0
Unsecured Canadian revolving credit facility, expiring May 2023 | Revolver borrowings | DTE Gas
Availability under combined facilities
Maximum borrowing capacity	0
Unsecured Canadian revolving credit facility, expiring May 2023 | Revolver borrowings | DTE Energy
Availability under combined facilities
Maximum borrowing capacity	83,000,000
Unsecured revolving credit facility, expiring April 2024 | Revolver borrowings
Availability under combined facilities
Maximum borrowing capacity	2,300,000,000
Unsecured revolving credit facility, expiring April 2024 | Revolver borrowings | DTE Electric
Availability under combined facilities
Maximum borrowing capacity	500,000,000
Unsecured revolving credit facility, expiring April 2024 | Revolver borrowings | DTE Gas
Availability under combined facilities
Maximum borrowing capacity	300,000,000
Unsecured revolving credit facility, expiring April 2024 | Revolver borrowings | DTE Energy
Availability under combined facilities
Maximum borrowing capacity	$ 1,500,000,000