Short-Term Credit Arrangements and Borrowings (Details)	Jun. 30, 2021 USD ($)
Availability under combined facilities
Maximum borrowing capacity	$ 2,732,000,000
Amounts outstanding	299,000,000
Net availability	2,433,000,000
DTE Electric
Availability under combined facilities
Maximum borrowing capacity	500,000,000
Amounts outstanding	0
Net availability	500,000,000
DTE Gas
Availability under combined facilities
Maximum borrowing capacity	300,000,000
Amounts outstanding	0
Net availability	300,000,000
DTE Energy
Availability under combined facilities
Maximum borrowing capacity	1,932,000,000
Amounts outstanding	299,000,000
Net availability	1,633,000,000
Revolver borrowings
Availability under combined facilities
Amounts outstanding	69,000,000
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	69,000,000
Letters of credit
Availability under combined facilities
Amounts outstanding	230,000,000
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	230,000,000
Unsecured revolving credit facility, expiring April 2025 | Revolver borrowings
Availability under combined facilities
Maximum borrowing capacity	2,300,000,000
Unsecured revolving credit facility, expiring April 2025 | Revolver borrowings | DTE Electric
Availability under combined facilities
Maximum borrowing capacity	500,000,000
Unsecured revolving credit facility, expiring April 2025 | Revolver borrowings | DTE Gas
Availability under combined facilities
Maximum borrowing capacity	300,000,000
Unsecured revolving credit facility, expiring April 2025 | Revolver borrowings | DTE Energy
Availability under combined facilities
Maximum borrowing capacity	1,500,000,000
Unsecured Canadian revolving credit facility, expiring May 2023 | Revolver borrowings
Availability under combined facilities
Maximum borrowing capacity	89,000,000
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	89,000,000
Secured revolving credit facility, expiring June 2026
Availability under combined facilities
Maximum borrowing capacity	33,000,000
Secured revolving credit facility, expiring June 2026 | DTE Electric
Availability under combined facilities
Maximum borrowing capacity	0
Secured revolving credit facility, expiring June 2026 | DTE Gas
Availability under combined facilities
Maximum borrowing capacity	0
Secured revolving credit facility, expiring June 2026 | DT Midstream
Availability under combined facilities
Maximum borrowing capacity	750,000,000
Secured revolving credit facility, expiring June 2026 | DTE Energy
Availability under combined facilities
Maximum borrowing capacity	33,000,000
Secured revolving credit facility, expiring June 2026 | Revolver borrowings | DTE Energy
Availability under combined facilities
Maximum borrowing capacity	25,000,000
Secured revolving credit facility, expiring June 2026 | Letters of credit | DTE Energy
Availability under combined facilities
Maximum borrowing capacity	8,000,000
Unsecured letter of credit facility, expiring in February 2023 | Letters of credit
Availability under combined facilities
Maximum borrowing capacity	150,000,000
Unsecured letter of credit facility, expiring in February 2023 | Letters of credit | DTE Electric
Availability under combined facilities
Maximum borrowing capacity	0
Unsecured letter of credit facility, expiring in February 2023 | Letters of credit | DTE Gas
Availability under combined facilities
Maximum borrowing capacity	0
Unsecured letter of credit facility, expiring in February 2023 | 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 letter of credit facility | Letters of credit
Availability under combined facilities
Maximum borrowing capacity	50,000,000
Unsecured letter of credit facility | Letters of credit | DTE Electric
Availability under combined facilities
Maximum borrowing capacity	0
Unsecured letter of credit facility | Letters of credit | DTE Gas
Availability under combined facilities
Maximum borrowing capacity	0
Unsecured letter of credit facility | Letters of credit | DTE Energy
Availability under combined facilities
Maximum borrowing capacity	50,000,000
Unsecured revolving credit facility, expiring April 2024 | Revolver borrowings
Availability under combined facilities
Maximum borrowing capacity	102,000,000
Unsecured revolving credit facility, expiring April 2024 | Revolver borrowings | DTE Electric
Availability under combined facilities
Maximum borrowing capacity	22,000,000
Unsecured revolving credit facility, expiring April 2024 | Revolver borrowings | DTE Gas
Availability under combined facilities
Maximum borrowing capacity	13,000,000
Unsecured revolving credit facility, expiring April 2024 | Revolver borrowings | DTE Energy
Availability under combined facilities
Maximum borrowing capacity	$ 67,000,000