Short-Term Credit Arrangements and Borrowings (Details)	Jun. 30, 2020 USD ($)
Availability under combined facilities
Maximum borrowing capacity	$ 3,808,000,000
Amounts outstanding	1,115,000,000
Net availability	2,693,000,000
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	2,508,000,000
Amounts outstanding	815,000,000
Net availability	1,693,000,000
Letters of credit
Availability under combined facilities
Amounts outstanding	201,000,000
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	201,000,000
Letters of credit | Unsecured letter of credit facility, expiring in February 2021
Availability under combined facilities
Maximum borrowing capacity	150,000,000
Letters of credit | Unsecured letter of credit facility, expiring in February 2021 | DTE Electric
Availability under combined facilities
Maximum borrowing capacity	0
Letters of credit | Unsecured letter of credit facility, expiring in February 2021 | DTE Gas
Availability under combined facilities
Maximum borrowing capacity	0
Letters of credit | Unsecured letter of credit facility, expiring in February 2021 | DTE Energy
Availability under combined facilities
Maximum borrowing capacity	150,000,000
Letters of credit | Unsecured letter of credit facility, expiring in August 2021
Availability under combined facilities
Maximum borrowing capacity	110,000,000
Letters of credit | Unsecured letter of credit facility, expiring in August 2021 | DTE Electric
Availability under combined facilities
Maximum borrowing capacity	0
Letters of credit | Unsecured letter of credit facility, expiring in August 2021 | DTE Gas
Availability under combined facilities
Maximum borrowing capacity	0
Letters of credit | Unsecured letter of credit facility, expiring in August 2021 | DTE Energy
Availability under combined facilities
Maximum borrowing capacity	110,000,000
Unsecured term loan
Availability under combined facilities
Amounts outstanding	800,000,000
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	500,000,000
Unsecured term loan | Unsecured term loan, expiring in March 2021
Availability under combined facilities
Maximum borrowing capacity	500,000,000
Unsecured term loan | Unsecured term loan, expiring in March 2021 | DTE Electric
Availability under combined facilities
Maximum borrowing capacity	0
Unsecured term loan | Unsecured term loan, expiring in March 2021 | DTE Gas
Availability under combined facilities
Maximum borrowing capacity	0
Unsecured term loan | Unsecured term loan, expiring in March 2021 | DTE Energy
Availability under combined facilities
Maximum borrowing capacity	500,000,000
Unsecured term loan | Unsecured term loans, expiring in April 2021
Availability under combined facilities
Maximum borrowing capacity	500,000,000
Unsecured term loan | Unsecured term loans, expiring in April 2021 | DTE Electric
Availability under combined facilities
Maximum borrowing capacity	400,000,000
Unsecured term loan | Unsecured term loans, expiring in April 2021 | DTE Gas
Availability under combined facilities
Maximum borrowing capacity	100,000,000
Unsecured term loan | Unsecured term loans, expiring in April 2021 | DTE Energy
Availability under combined facilities
Maximum borrowing capacity	0
Unsecured term loan | Unsecured term loan, expiring in June 2021
Availability under combined facilities
Maximum borrowing capacity	167,000,000
Unsecured term loan | Unsecured term loan, expiring in June 2021 | DTE Electric
Availability under combined facilities
Maximum borrowing capacity	0
Unsecured term loan | Unsecured term loan, expiring in June 2021 | DTE Gas
Availability under combined facilities
Maximum borrowing capacity	0
Unsecured term loan | Unsecured term loan, expiring in June 2021 | DTE Energy
Availability under combined facilities
Maximum borrowing capacity	167,000,000
Revolving credit facility
Availability under combined facilities
Amounts outstanding	114,000,000
Revolving credit facility | DTE Electric
Availability under combined facilities
Amounts outstanding	0
Revolving credit facility | DTE Gas
Availability under combined facilities
Amounts outstanding	0
Revolving credit facility | DTE Energy
Availability under combined facilities
Amounts outstanding	114,000,000
Revolving credit facility | Unsecured Canadian revolving credit facility, expiring May 2023
Availability under combined facilities
Maximum borrowing capacity	81,000,000
Revolving credit facility | Unsecured Canadian revolving credit facility, expiring May 2023 | DTE Electric
Availability under combined facilities
Maximum borrowing capacity	0
Revolving credit facility | Unsecured Canadian revolving credit facility, expiring May 2023 | DTE Gas
Availability under combined facilities
Maximum borrowing capacity	0
Revolving credit facility | Unsecured Canadian revolving credit facility, expiring May 2023 | DTE Energy
Availability under combined facilities
Maximum borrowing capacity	81,000,000
Revolving credit facility | Unsecured revolving credit facility, expiring April 2024
Availability under combined facilities
Maximum borrowing capacity	2,300,000,000
Revolving credit facility | Unsecured revolving credit facility, expiring April 2024 | DTE Electric
Availability under combined facilities
Maximum borrowing capacity	500,000,000
Revolving credit facility | Unsecured revolving credit facility, expiring April 2024 | DTE Gas
Availability under combined facilities
Maximum borrowing capacity	300,000,000
Revolving credit facility | Unsecured revolving credit facility, expiring April 2024 | DTE Energy
Availability under combined facilities
Maximum borrowing capacity	$ 1,500,000,000