Significant Accounting Policies (Details Textuals) - USD ($)	12 Months Ended
	Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2023
Significant Accounting Policies [Line Items]
Unbilled revenues	$ 2,031,000,000	$ 1,690,000,000
Specific review of probable future collections based on receivable balances, threshold duration (in days)	30 days
Goodwill impairments	$ 0	0
Goodwill changes in carrying value	0	0
Intangible assets amortization expense	18,000,000	16,000,000	$ 15,000,000
Excise and sales taxes net impact on statement of operations	0
Charitable contributions	20,000,000	10,000,000	$ 0
Natural gas inventory
Significant Accounting Policies [Line Items]
LIFO inventory amount	43,000,000	69,000,000
Excess of replacement costs over stated LIFO value	147,000,000	81,000,000
Notes receivable
Significant Accounting Policies [Line Items]
Financing receivables	1,455,000,000
Past due
Significant Accounting Policies [Line Items]
Financing receivables	$ 0
Minimum | Notes receivable
Significant Accounting Policies [Line Items]
Number of days after which receivable is considered delinquent (in days)	60 days
Maximum | Notes receivable
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
Significant Accounting Policies [Line Items]
Financing receivables	$ 274,000,000
DTE Electric | Minimum | Notes receivable
Significant Accounting Policies [Line Items]
Number of days after which receivable is considered delinquent (in days)	60 days
DTE Electric | Maximum | Notes receivable
Significant Accounting Policies [Line Items]
Number of days after which receivable is considered delinquent (in days)	120 days
Unbilled revenues
Significant Accounting Policies [Line Items]
Unbilled revenues	$ 1,300,000,000	1,000,000,000.0
Unbilled revenues | DTE Electric
Significant Accounting Policies [Line Items]
Unbilled revenues	$ 322,000,000	$ 303,000,000