Short-Term Credit Arrangements and Borrowings (Availability Under Credit Facilities) (Details) $ in Millions	Sep. 30, 2025 USD ($)
Line Of Credit Facility [Line Items]
Maximum borrowing capacity	$ 3,200
Amounts outstanding at September 30, 2025	660
Net availability at September 30, 2025	2,540
DTE Electric
Line Of Credit Facility [Line Items]
Maximum borrowing capacity	950
Amounts outstanding at September 30, 2025	349
Net availability at September 30, 2025	601
DTE Gas
Line Of Credit Facility [Line Items]
Maximum borrowing capacity	300
Amounts outstanding at September 30, 2025	0
Net availability at September 30, 2025	300
DTE Energy
Line Of Credit Facility [Line Items]
Maximum borrowing capacity	1,950
Amounts outstanding at September 30, 2025	311
Net availability at September 30, 2025	1,639
Letters of credit
Line Of Credit Facility [Line Items]
Amounts outstanding at September 30, 2025	444
Letters of credit \| DTE Electric
Line Of Credit Facility [Line Items]
Amounts outstanding at September 30, 2025	133
Letters of credit \| DTE Gas
Line Of Credit Facility [Line Items]
Amounts outstanding at September 30, 2025	0
Letters of credit \| DTE Energy
Line Of Credit Facility [Line Items]
Amounts outstanding at September 30, 2025	311
Commercial paper issuances
Line Of Credit Facility [Line Items]
Amounts outstanding at September 30, 2025	216
Commercial paper issuances \| DTE Electric
Line Of Credit Facility [Line Items]
Amounts outstanding at September 30, 2025	216
Commercial paper issuances \| DTE Gas
Line Of Credit Facility [Line Items]
Amounts outstanding at September 30, 2025	0
Commercial paper issuances \| DTE Energy
Line Of Credit Facility [Line Items]
Amounts outstanding at September 30, 2025	0
Unsecured revolving credit facility, expiring October 2029 \| Revolving credit facility
Line Of Credit Facility [Line Items]
Maximum borrowing capacity	2,600
Unsecured revolving credit facility, expiring October 2029 \| Revolving credit facility \| DTE Electric
Line Of Credit Facility [Line Items]
Maximum borrowing capacity	800
Unsecured revolving credit facility, expiring October 2029 \| Revolving credit facility \| DTE Gas
Line Of Credit Facility [Line Items]
Maximum borrowing capacity	300
Unsecured revolving credit facility, expiring October 2029 \| Revolving credit facility \| DTE Energy
Line Of Credit Facility [Line Items]
Maximum borrowing capacity	1,500
Unsecured letter of credit facility, expiring June 2026 \| Letters of credit
Line Of Credit Facility [Line Items]
Maximum borrowing capacity	150
Unsecured letter of credit facility, expiring June 2026 \| Letters of credit \| DTE Electric
Line Of Credit Facility [Line Items]
Maximum borrowing capacity	0
Unsecured letter of credit facility, expiring June 2026 \| Letters of credit \| DTE Gas
Line Of Credit Facility [Line Items]
Maximum borrowing capacity	0
Unsecured letter of credit facility, expiring June 2026 \| Letters of credit \| DTE Energy
Line Of Credit Facility [Line Items]
Maximum borrowing capacity	150
Unsecured letter of credit facility, expiring February 2027 \| Letters of credit
Line Of Credit Facility [Line Items]
Maximum borrowing capacity	150
Unsecured letter of credit facility, expiring February 2027 \| Letters of credit \| DTE Electric
Line Of Credit Facility [Line Items]
Maximum borrowing capacity	0
Unsecured letter of credit facility, expiring February 2027 \| Letters of credit \| DTE Gas
Line Of Credit Facility [Line Items]
Maximum borrowing capacity	0
Unsecured letter of credit facility, expiring February 2027 \| Letters of credit \| DTE Energy
Line Of Credit Facility [Line Items]
Maximum borrowing capacity	150
Unsecured letter of credit facility, expiring June 2027 \| Letters of credit
Line Of Credit Facility [Line Items]
Maximum borrowing capacity	100
Unsecured letter of credit facility, expiring June 2027 \| Letters of credit \| DTE Electric
Line Of Credit Facility [Line Items]
Maximum borrowing capacity	0
Unsecured letter of credit facility, expiring June 2027 \| Letters of credit \| DTE Gas
Line Of Credit Facility [Line Items]
Maximum borrowing capacity	0
Unsecured letter of credit facility, expiring June 2027 \| Letters of credit \| DTE Energy
Line Of Credit Facility [Line Items]
Maximum borrowing capacity	100
Unsecured letter of credit facility \| Letters of credit
Line Of Credit Facility [Line Items]
Maximum borrowing capacity	50
Unsecured letter of credit facility \| Letters of credit \| DTE Electric
Line Of Credit Facility [Line Items]
Maximum borrowing capacity	0
Unsecured letter of credit facility \| Letters of credit \| DTE Gas
Line Of Credit Facility [Line Items]
Maximum borrowing capacity	0
Unsecured letter of credit facility \| Letters of credit \| DTE Energy
Line Of Credit Facility [Line Items]
Maximum borrowing capacity	50
Unsecured letter of credit facility \| Letters of credit
Line Of Credit Facility [Line Items]
Maximum borrowing capacity	150
Unsecured letter of credit facility \| Letters of credit \| DTE Electric
Line Of Credit Facility [Line Items]
Maximum borrowing capacity	150
Unsecured letter of credit facility \| Letters of credit \| DTE Gas
Line Of Credit Facility [Line Items]
Maximum borrowing capacity	0
Unsecured letter of credit facility \| Letters of credit \| DTE Energy
Line Of Credit Facility [Line Items]
Maximum borrowing capacity	$ 0

DTE ENERGY CO 10-Q