Short-Term Credit Arrangements and Borrowings (Availability Under Credit Facilities) (Details) $ in Millions	Sep. 30, 2026 USD ($)
Line Of Credit Facility [Line Items]
Maximum borrowing capacity	$ 4,325
Amounts outstanding at September 30, 2026	1,834
Net availability at September 30, 2026	2,491
DTE Electric
Line Of Credit Facility [Line Items]
Maximum borrowing capacity	1,900
Amounts outstanding at September 30, 2026	1,275
Net availability at September 30, 2026	625
DTE Gas
Line Of Credit Facility [Line Items]
Maximum borrowing capacity	300
Amounts outstanding at September 30, 2026	0
Net availability at September 30, 2026	300
DTE Energy
Line Of Credit Facility [Line Items]
Maximum borrowing capacity	2,125
Amounts outstanding at September 30, 2026	559
Net availability at September 30, 2026	1,566
Revolving credit facility | Unsecured revolving credit facility, expiring October 2030
Line Of Credit Facility [Line Items]
Maximum borrowing capacity	2,800
Revolving credit facility | Unsecured revolving credit facility, expiring October 2030 | DTE Electric
Line Of Credit Facility [Line Items]
Maximum borrowing capacity	1,000
Revolving credit facility | Unsecured revolving credit facility, expiring October 2030 | DTE Gas
Line Of Credit Facility [Line Items]
Maximum borrowing capacity	300
Revolving credit facility | Unsecured revolving credit facility, expiring October 2030 | DTE Energy
Line Of Credit Facility [Line Items]
Maximum borrowing capacity	1,500
Letters of credit
Line Of Credit Facility [Line Items]
Amounts outstanding at September 30, 2026	1,097
Letters of credit | DTE Electric
Line Of Credit Facility [Line Items]
Amounts outstanding at September 30, 2026	538
Letters of credit | DTE Gas
Line Of Credit Facility [Line Items]
Amounts outstanding at September 30, 2026	0
Letters of credit | DTE Energy
Line Of Credit Facility [Line Items]
Amounts outstanding at September 30, 2026	559
Letters of credit | Unsecured letter of credit facility, expiring May 2028
Line Of Credit Facility [Line Items]
Maximum borrowing capacity	200
Letters of credit | Unsecured letter of credit facility, expiring May 2028 | DTE Electric
Line Of Credit Facility [Line Items]
Maximum borrowing capacity	0
Letters of credit | Unsecured letter of credit facility, expiring May 2028 | DTE Gas
Line Of Credit Facility [Line Items]
Maximum borrowing capacity	0
Letters of credit | Unsecured letter of credit facility, expiring May 2028 | DTE Energy
Line Of Credit Facility [Line Items]
Maximum borrowing capacity	200
Letters of credit | Unsecured letter of credit facility, expiring February 2027
Line Of Credit Facility [Line Items]
Maximum borrowing capacity	200
Letters of credit | Unsecured letter of credit facility, expiring February 2027 | DTE Electric
Line Of Credit Facility [Line Items]
Maximum borrowing capacity	0
Letters of credit | Unsecured letter of credit facility, expiring February 2027 | DTE Gas
Line Of Credit Facility [Line Items]
Maximum borrowing capacity	0
Letters of credit | Unsecured letter of credit facility, expiring February 2027 | DTE Energy
Line Of Credit Facility [Line Items]
Maximum borrowing capacity	200
Letters of credit | Unsecured letter of credit facilities, expiring June 2028
Line Of Credit Facility [Line Items]
Maximum borrowing capacity	225
Letters of credit | Unsecured letter of credit facilities, expiring June 2028 | DTE Electric
Line Of Credit Facility [Line Items]
Maximum borrowing capacity	0
Letters of credit | Unsecured letter of credit facilities, expiring June 2028 | DTE Gas
Line Of Credit Facility [Line Items]
Maximum borrowing capacity	0
Letters of credit | Unsecured letter of credit facilities, expiring June 2028 | DTE Energy
Line Of Credit Facility [Line Items]
Maximum borrowing capacity	225
Letters of credit | Unsecured letter of credit facility
Line Of Credit Facility [Line Items]
Maximum borrowing capacity	75
Letters of credit | Unsecured letter of credit facility | DTE Electric
Line Of Credit Facility [Line Items]
Maximum borrowing capacity	75
Letters of credit | Unsecured letter of credit facility | DTE Gas
Line Of Credit Facility [Line Items]
Maximum borrowing capacity	0
Letters of credit | Unsecured letter of credit facility | DTE Energy
Line Of Credit Facility [Line Items]
Maximum borrowing capacity	0
Letters of credit | Unsecured letter of credit facilities, expiring August 2027
Line Of Credit Facility [Line Items]
Maximum borrowing capacity	100
Letters of credit | Unsecured letter of credit facilities, expiring August 2027 | DTE Electric
Line Of Credit Facility [Line Items]
Maximum borrowing capacity	100
Letters of credit | Unsecured letter of credit facilities, expiring August 2027 | DTE Gas
Line Of Credit Facility [Line Items]
Maximum borrowing capacity	0
Letters of credit | Unsecured letter of credit facilities, expiring August 2027 | DTE Energy
Line Of Credit Facility [Line Items]
Maximum borrowing capacity	0
Letters of credit | Unsecured letter of credit facilities, expiring August 2027
Line Of Credit Facility [Line Items]
Maximum borrowing capacity	200
Letters of credit | Unsecured letter of credit facilities, expiring August 2027 | DTE Electric
Line Of Credit Facility [Line Items]
Maximum borrowing capacity	200
Letters of credit | Unsecured letter of credit facilities, expiring August 2027 | DTE Gas
Line Of Credit Facility [Line Items]
Maximum borrowing capacity	0
Letters of credit | Unsecured letter of credit facilities, expiring August 2027 | DTE Energy
Line Of Credit Facility [Line Items]
Maximum borrowing capacity	0
Letters of credit | Unsecured letter of credit facility
Line Of Credit Facility [Line Items]
Maximum borrowing capacity	225
Letters of credit | Unsecured letter of credit facility | DTE Electric
Line Of Credit Facility [Line Items]
Maximum borrowing capacity	225
Letters of credit | Unsecured letter of credit facility | DTE Gas
Line Of Credit Facility [Line Items]
Maximum borrowing capacity	0
Letters of credit | Unsecured letter of credit facility | DTE Energy
Line Of Credit Facility [Line Items]
Maximum borrowing capacity	0
Letters of credit | Unsecured letter of credit facility
Line Of Credit Facility [Line Items]
Maximum borrowing capacity	150
Letters of credit | Unsecured letter of credit facility | DTE Electric
Line Of Credit Facility [Line Items]
Maximum borrowing capacity	150
Letters of credit | Unsecured letter of credit facility | DTE Gas
Line Of Credit Facility [Line Items]
Maximum borrowing capacity	0
Letters of credit | Unsecured letter of credit facility | DTE Energy
Line Of Credit Facility [Line Items]
Maximum borrowing capacity	0
Commercial paper issuances
Line Of Credit Facility [Line Items]
Amounts outstanding at September 30, 2026	737
Commercial paper issuances | DTE Electric
Line Of Credit Facility [Line Items]
Amounts outstanding at September 30, 2026	737
Commercial paper issuances | DTE Gas
Line Of Credit Facility [Line Items]
Amounts outstanding at September 30, 2026	0
Commercial paper issuances | DTE Energy
Line Of Credit Facility [Line Items]
Amounts outstanding at September 30, 2026	$ 0