Significant Accounting Policies (Details Textuals) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2026	Sep. 30, 2025	Sep. 30, 2026	Sep. 30, 2025	Dec. 31, 2025
Significant Accounting Policies [Line Items]
Unrecognized compensation cost	$ 88		$ 88
Recognition period (in years)			1 year 9 months 18 days
Specific review of probable future collections based on receivable balances, threshold duration (in days)			30 days
Past due
Significant Accounting Policies [Line Items]
Financing receivables	0		$ 0
Notes receivable
Significant Accounting Policies [Line Items]
Financing receivables	$ 1,618		$ 1,618
Notes receivable | Minimum
Significant Accounting Policies [Line Items]
Number of days after which receivable is considered delinquent (in days)	60 days		60 days
Notes receivable | Maximum
Significant Accounting Policies [Line Items]
Number of days after which receivable is considered delinquent (in days)	120 days		120 days
DTE Electric and DTE Gas
Significant Accounting Policies [Line Items]
Threshold period past due for write-off of trade accounts receivable (in days)			150 days
DTE Electric and DTE Gas | Accounts receivable
Significant Accounting Policies [Line Items]
Number of days after which receivable is considered delinquent (in days)	21 days		21 days
DTE Electric | Notes receivable | Minimum
Significant Accounting Policies [Line Items]
Number of days after which receivable is considered delinquent (in days)	60 days		60 days
DTE Electric | Notes receivable | Maximum
Significant Accounting Policies [Line Items]
Number of days after which receivable is considered delinquent (in days)	120 days		120 days
DTE Electric | Affiliates | Federal taxes
Significant Accounting Policies [Line Items]
Tax receivables	$ 12		$ 12
Tax payables					$ 1
DTE Electric | Affiliates | State taxes
Significant Accounting Policies [Line Items]
Tax receivables	2		2
DTE Electric | DTE Energy
Significant Accounting Policies [Line Items]
Allocated costs	$ 12	$ 11	$ 36	$ 30