Short-Term Credit Arrangements and Borrowings (Details) - USD ($)	Sep. 30, 2019	Aug. 31, 2019
Availability under combined facilities
Maximum borrowing capacity	$ 2,560,000,000
Amounts outstanding	915,000,000
Net availability	1,645,000,000
DTE Electric
Availability under combined facilities
Maximum borrowing capacity	500,000,000
Amounts outstanding	382,000,000
Net availability	118,000,000
DTE Gas
Availability under combined facilities
Maximum borrowing capacity	300,000,000
Amounts outstanding	232,000,000
Net availability	68,000,000
DTE Energy
Availability under combined facilities
Maximum borrowing capacity	1,760,000,000
Amounts outstanding	301,000,000
Net availability	1,459,000,000
Letter of credit
Availability under combined facilities
Amounts outstanding	191,000,000
Letter of credit | DTE Electric
Availability under combined facilities
Amounts outstanding	0
Letter of credit | DTE Gas
Availability under combined facilities
Amounts outstanding	0
Letter of credit | DTE Energy
Availability under combined facilities
Amounts outstanding	191,000,000
Letter of credit | Unsecured letter of credit facility, expiring in February 2021
Availability under combined facilities
Maximum borrowing capacity	150,000,000
Letter of credit | Unsecured letter of credit facility, expiring in February 2021 | DTE Electric
Availability under combined facilities
Maximum borrowing capacity	0
Letter of credit | Unsecured letter of credit facility, expiring in February 2021 | DTE Gas
Availability under combined facilities
Maximum borrowing capacity	0
Letter of credit | Unsecured letter of credit facility, expiring in February 2021 | DTE Energy
Availability under combined facilities
Maximum borrowing capacity	150,000,000
Letter of credit | Unsecured letter of credit facility, expiring in August 2021
Availability under combined facilities
Maximum borrowing capacity	110,000,000
Letter of credit | Unsecured letter of credit facility, expiring in August 2021 | DTE Electric
Availability under combined facilities
Maximum borrowing capacity	0
Letter of credit | Unsecured letter of credit facility, expiring in August 2021 | DTE Gas
Availability under combined facilities
Maximum borrowing capacity	0
Letter of credit | Unsecured letter of credit facility, expiring in August 2021 | DTE Energy
Availability under combined facilities
Maximum borrowing capacity	110,000,000	$ 110,000,000
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
Commercial paper issuances
Availability under combined facilities
Amounts outstanding	724,000,000
Commercial paper issuances | DTE Electric
Availability under combined facilities
Amounts outstanding	382,000,000
Commercial paper issuances | DTE Gas
Availability under combined facilities
Amounts outstanding	232,000,000
Commercial paper issuances | DTE Energy
Availability under combined facilities
Amounts outstanding	$ 110,000,000