Significant Accounting Policies (Details Textuals) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2026	Mar. 31, 2025	Dec. 31, 2025
Significant Accounting Policies [Line Items]
Unrecognized compensation cost	$ 111
Recognition period (in years)	2 years 1 month 6 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
Notes receivable
Significant Accounting Policies [Line Items]
Financing receivables	$ 1,515
Notes receivable | Minimum
Significant Accounting Policies [Line Items]
Number of days after which receivable is considered delinquent (in days)	60 days
Notes receivable | Maximum
Significant Accounting Policies [Line Items]
Number of days after which receivable is considered delinquent (in 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
DTE Electric | Notes receivable | Minimum
Significant Accounting Policies [Line Items]
Number of days after which receivable is considered delinquent (in 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
DTE Electric | Affiliates | State taxes
Significant Accounting Policies [Line Items]
Income taxes receivable	$ 1
DTE Electric | Affiliates | Federal taxes
Significant Accounting Policies [Line Items]
Income taxes receivable	12		$ 1
DTE Electric | DTE Energy
Significant Accounting Policies [Line Items]
Allocated costs	$ 13	$ 10