Short-Term Credit Arrangements and Borrowings (Availability Under Credit Facilities) (Details) $ in Millions	Jun. 30, 2026 USD ($)
Line Of Credit Facility [Line Items]
Maximum borrowing capacity	$ 4,025
Amounts outstanding at June 30, 2026	1,083
Net availability at June 30, 2026	2,942
DTE Electric
Line Of Credit Facility [Line Items]
Maximum borrowing capacity	1,600
Amounts outstanding at June 30, 2026	567
Net availability at June 30, 2026	1,033
DTE Gas
Line Of Credit Facility [Line Items]
Maximum borrowing capacity	300
Amounts outstanding at June 30, 2026	0
Net availability at June 30, 2026	300
DTE Energy
Line Of Credit Facility [Line Items]
Maximum borrowing capacity	2,125
Amounts outstanding at June 30, 2026	516
Net availability at June 30, 2026	1,609
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 June 30, 2026	1,083
Letters of credit \| DTE Electric
Line Of Credit Facility [Line Items]
Amounts outstanding at June 30, 2026	567
Letters of credit \| DTE Gas
Line Of Credit Facility [Line Items]
Amounts outstanding at June 30, 2026	0
Letters of credit \| DTE Energy
Line Of Credit Facility [Line Items]
Amounts outstanding at June 30, 2026	516
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 December 2026
Line Of Credit Facility [Line Items]
Maximum borrowing capacity	150
Letters of credit \| Unsecured letter of credit facilities, expiring December 2026 \| DTE Electric
Line Of Credit Facility [Line Items]
Maximum borrowing capacity	150
Letters of credit \| Unsecured letter of credit facilities, expiring December 2026 \| DTE Gas
Line Of Credit Facility [Line Items]
Maximum borrowing capacity	0
Letters of credit \| Unsecured letter of credit facilities, expiring December 2026 \| 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