Short-Term Credit Arrangements and Borrowings (Availability Under Credit Facilities) (Details) $ in Millions	Mar. 31, 2026 USD ($)
Line Of Credit Facility [Line Items]
Maximum borrowing capacity	$ 3,900
Amounts outstanding at March 31, 2026	778
Net availability at March 31, 2026	3,122
DTE Electric
Line Of Credit Facility [Line Items]
Maximum borrowing capacity	1,600
Amounts outstanding at March 31, 2026	414
Net availability at March 31, 2026	1,186
DTE Gas
Line Of Credit Facility [Line Items]
Maximum borrowing capacity	300
Amounts outstanding at March 31, 2026	0
Net availability at March 31, 2026	300
DTE Energy
Line Of Credit Facility [Line Items]
Maximum borrowing capacity	2,000
Amounts outstanding at March 31, 2026	364
Net availability at March 31, 2026	1,636
Revolving credit facility | Unsecured Revolving Credit Facility Expiring In October 2030
Line Of Credit Facility [Line Items]
Maximum borrowing capacity	2,800
Revolving credit facility | Unsecured Revolving Credit Facility Expiring In October 2030 | DTE Electric
Line Of Credit Facility [Line Items]
Maximum borrowing capacity	1,000
Revolving credit facility | Unsecured Revolving Credit Facility Expiring In October 2030 | DTE Gas
Line Of Credit Facility [Line Items]
Maximum borrowing capacity	300
Revolving credit facility | Unsecured Revolving Credit Facility Expiring In 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 March 31, 2026	778
Letters of credit | DTE Electric
Line Of Credit Facility [Line Items]
Amounts outstanding at March 31, 2026	414
Letters of credit | DTE Gas
Line Of Credit Facility [Line Items]
Amounts outstanding at March 31, 2026	0
Letters of credit | DTE Energy
Line Of Credit Facility [Line Items]
Amounts outstanding at March 31, 2026	364
Letters of credit | Unsecured letter of credit facility, expiring June 2026
Line Of Credit Facility [Line Items]
Maximum borrowing capacity	150
Letters of credit | Unsecured letter of credit facility, expiring June 2026 | DTE Electric
Line Of Credit Facility [Line Items]
Maximum borrowing capacity	0
Letters of credit | Unsecured letter of credit facility, expiring June 2026 | DTE Gas
Line Of Credit Facility [Line Items]
Maximum borrowing capacity	0
Letters of credit | Unsecured letter of credit facility, expiring June 2026 | DTE Energy
Line Of Credit Facility [Line Items]
Maximum borrowing capacity	150
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 Facility Expiring In June 2028
Line Of Credit Facility [Line Items]
Maximum borrowing capacity	150
Letters of credit | Unsecured Letter Of Credit Facility Expiring In June 2028 | DTE Electric
Line Of Credit Facility [Line Items]
Maximum borrowing capacity	0
Letters of credit | Unsecured Letter Of Credit Facility Expiring In June 2028 | DTE Gas
Line Of Credit Facility [Line Items]
Maximum borrowing capacity	0
Letters of credit | Unsecured Letter Of Credit Facility Expiring In June 2028 | DTE Energy
Line Of Credit Facility [Line Items]
Maximum borrowing capacity	150
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