Commitments and Contingencies (Details)	3 Months Ended	9 Months Ended	12 Months Ended
	Sep. 30, 2025 USD ($) employee	Sep. 30, 2025 USD ($) employee site	Dec. 31, 2022 USD ($)	Dec. 31, 2024 USD ($)
Loss Contingencies [Line Items]
Asset retirement obligations	$ 4,413,000,000	$ 4,413,000,000		$ 4,031,000,000
Estimated capital expenditures for current fiscal year	4,900,000,000	4,900,000,000
Penalties Related to EES Coke | Pending litigation
Loss Contingencies [Line Items]
Loss contingency accrual	$ 8,000,000	$ 8,000,000
Workforce subject to collective bargaining arrangements | Labor force concentration risk
Loss Contingencies [Line Items]
Entity number of employees | employee	4,800	4,800
Percentage of total employees		50.00%
Workforce subject to collective bargaining arrangements expiring within one year | Labor force concentration risk
Loss Contingencies [Line Items]
Percentage of total employees		15.00%
Reduced emissions fuel guarantees
Loss Contingencies [Line Items]
Number of days after expiration of statutes of limitations (in days)		90 days
Maximum potential liability	$ 201,000,000	$ 201,000,000
Other guarantees
Loss Contingencies [Line Items]
Maximum potential liability	69,000,000	69,000,000
Performance surety bonds
Loss Contingencies [Line Items]
Performance bonds outstanding	424,000,000	424,000,000
Performance surety bonds | Energy Trading segment
Loss Contingencies [Line Items]
Performance bonds outstanding	131,000,000	$ 131,000,000
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]
Environmental capital expenditures	2,400,000,000	$ 2,400,000,000
Estimated environmental capital expenditures		$ 0
Number of former MGP sites | site		3
Accrued for remediation	10,000,000	$ 10,000,000		10,000,000
Asset retirement obligations	4,163,000,000	4,163,000,000		3,791,000,000
Estimated capital expenditures for current fiscal year	$ 3,700,000,000	$ 3,700,000,000
DTE Electric | Ludington Plant Contract Dispute | Pending litigation
Loss Contingencies [Line Items]
Damages sought, percentage liable			49.00%
DTE Electric | Workforce subject to collective bargaining arrangements | Labor force concentration risk
Loss Contingencies [Line Items]
Entity number of employees | employee	2,550	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		22.00%
DTE Electric | Minimum | Ludington Plant Contract Dispute | Pending litigation
Loss Contingencies [Line Items]
Estimated impact of loss contingency	$ 350,000,000	$ 350,000,000
DTE Electric | Maximum | Ludington Plant Contract Dispute | Pending litigation
Loss Contingencies [Line Items]
Estimated impact of loss contingency	400,000,000	400,000,000
DTE Electric | Performance surety bonds
Loss Contingencies [Line Items]
Performance bonds outstanding	248,000,000	248,000,000
DTE Electric | Legacy CCR Surface Impoundments And CCR Management Units
Loss Contingencies [Line Items]
Asset retirement obligations	430,000,000	430,000,000
Asset retirement obligation, period increase	130,000,000
DTE Electric | Coal Combustion Residual and Effluent Limitations Guidelines Rules, capital expenditures
Loss Contingencies [Line Items]
Estimated impact of loss contingency	414,000,000	$ 414,000,000
DTE Gas
Loss Contingencies [Line Items]
Number of former MGP sites | site		14
Accrued for remediation	$ 25,000,000	$ 25,000,000		$ 26,000,000
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			$ 15,000,000