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Commitments and Contingencies (Details) $ in Millions		3 Months Ended	6 Months Ended	12 Months Ended
Commitments and Contingencies (Details) $ in Millions	Feb. 17, 2026 USD ($)	Mar. 31, 2026 USD ($)	Jun. 30, 2026 USD ($) employee site	Dec. 31, 2022 USD ($)	Dec. 31, 2025 USD ($)
Loss Contingencies [Line Items]
Asset retirement obligations			$ 4,710		$ 4,469
Estimated capital expenditures for current fiscal year			6,800
Penalties Related to EES Coke \| Pending litigation
Loss Contingencies [Line Items]
Civil penalty accrued	$ 100
Loss contingency accrual, period increase		$ 112
Loss contingency accrual			$ 120
Penalties For Installation of Pollution Controls and Establishing and Funding an Action Committee for Community Air Quality Improvement Projects \| Pending litigation
Loss Contingencies [Line Items]
Remediation costs	$ 20
Workforce subject to collective bargaining arrangements \| Labor force concentration risk
Loss Contingencies [Line Items]
Entity number of employees \| employee			4,700
Percentage of total employees			49.00%
Workforce subject to collective bargaining arrangements expiring within one year \| Labor force concentration risk
Loss Contingencies [Line Items]
Percentage of total employees			72.00%
Reduced emissions fuel guarantees
Loss Contingencies [Line Items]
Number of days after expiration of statutes of limitations (in days)			90 days
Maximum potential liability			$ 201
Other guarantees
Loss Contingencies [Line Items]
Maximum potential liability			64
Performance surety bonds
Loss Contingencies [Line Items]
Performance bonds outstanding			377
Performance surety bonds \| Energy Trading segment
Loss Contingencies [Line Items]
Performance bonds outstanding			$ 91
Performance surety bonds \| Minimum \| Energy Trading segment
Loss Contingencies [Line Items]
Performance bonds term (in years)			1 year
Performance surety bonds \| Maximum \| Energy Trading segment
Loss Contingencies [Line Items]
Performance bonds term (in years)			3 years
DTE Electric
Loss Contingencies [Line Items]
Number of former MGP sites \| site			3
Accrued for remediation			$ 10		10
Asset retirement obligations			4,451		4,217
Estimated capital expenditures for current fiscal year			$ 5,200
DTE Electric \| Workforce subject to collective bargaining arrangements \| Labor force concentration risk
Loss Contingencies [Line Items]
Entity number of employees \| employee			2,550
Percentage of total employees			58.00%
DTE Electric \| Workforce subject to collective bargaining arrangements expiring within one year \| Labor force concentration risk
Loss Contingencies [Line Items]
Percentage of total employees			99.00%
DTE Electric \| Minimum \| Ludington Plant Contract Dispute \| Pending litigation
Loss Contingencies [Line Items]
Estimated impact of loss contingency			$ 350
DTE Electric \| Maximum \| Ludington Plant Contract Dispute \| Pending litigation
Loss Contingencies [Line Items]
Estimated impact of loss contingency			400
DTE Electric \| Performance surety bonds
Loss Contingencies [Line Items]
Performance bonds outstanding			272
DTE Electric \| Legacy CCR Surface Impoundments And CCR Management Units
Loss Contingencies [Line Items]
Asset retirement obligations			420
DTE Electric \| Coal Combustion Residual and Effluent Limitations Guidelines Rules, capital expenditures
Loss Contingencies [Line Items]
Estimated impact of loss contingency			$ 369
DTE Gas
Loss Contingencies [Line Items]
Number of former MGP sites \| site			14
Accrued for remediation			$ 25		$ 25
Amortization period (in years)			10 years
DTE Gas \| Clean up completed and site closed
Loss Contingencies [Line Items]
Number of former MGP sites \| site			8
DTE Gas \| Partial closure complete
Loss Contingencies [Line Items]
Number of former MGP sites \| site			5
TAES and Toshiba Corporation \| Ludington Plant Contract Dispute \| DTE Electric and Consumers \| Pending litigation
Loss Contingencies [Line Items]
Damages sought				$ 15