Significant Accounting Policies (Tables)

12 Months Ended

Dec. 31, 2025

Accounting Policies [Abstract]

Schedule of Other Income

The following is a summary of DTE Energy's Other income:

	Year Ended December 31,
	2025		2024		2023
	(In millions)
Allowance for equity funds used during construction	$	105	$	86	$	42
Equity earnings of equity method investees	47		15		3
Contract services	43		34		26
Investment income(a)	17		17		17
Other	18		15		14
	$	230	$	167	$	102

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(a)Investment losses are recorded separately to Other expenses on the Consolidated Statements of Operations.

The following is a summary of DTE Electric's Other income:

	Year Ended December 31,
	2025		2024		2023
	(In millions)
Allowance for equity funds used during construction	$	103	$	84	$	40
Contract services	43		33		25
Investment income(a)	14		13		11
Other	11		14		11
	$	171	$	144	$	87

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(a)Investment losses are recorded separately to Other expenses on the Consolidated Statements of Operations.

Schedule of Accumulated Other Comprehensive Income (Loss)

The following table summarizes the changes in DTE Energy's Accumulated other comprehensive income (loss) by component(a) for the years ended December 31, 2025 and 2024:

	Net Unrealized Gain (Loss) on Derivatives		Benefit Obligations(b)		Foreign Currency Translation		Total
	(In millions)
Balance, December 31, 2023	$	(17)	$	(52)	$	2	$	(67)
Other comprehensive income (loss) before reclassifications	47		(3)		(7)		37
Amounts reclassified from Accumulated other comprehensive loss	—		4		—		4
Net current period Other comprehensive income (loss)	47		1		(7)		41
Balance, December 31, 2024	$	30	$	(51)	$	(5)	$	(26)
Other comprehensive income (loss) before reclassifications	(8)		(9)		3		(14)
Amounts reclassified from Accumulated other comprehensive loss	(3)		4		—		1
Net current period Other comprehensive income (loss)	(11)		(5)		3		(13)
Balance, December 31, 2025	$	19	$	(56)	$	(2)	$	(39)

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(a)All amounts are net of tax, except for foreign currency translation.

(b)Benefit obligations activity includes changes in actuarial (gain) loss and prior service cost in DTE Energy's pension and other postretirement benefit plans. Refer to Note 20 to the Consolidated Financial Statements, "Retirement Benefits and Trusteed Assets," for details regarding this activity.

Schedule of Financing Receivables Classified by Internal Grade of Credit Risk

The following represents the Registrants' financing receivables by year of origination as determined by the date the original agreement was executed, classified by internal grade of credit risk, including current year-to-date gross write-offs, if any. The related credit quality indicators and risk ratings utilized to develop the internal grades have been updated through December 31, 2025.

	DTE Energy								DTE Electric(a)
	Year of Origination
	2025		2024		2023 and prior		Total		2025 and prior
	(In millions)
Notes receivable
Internal grade 1	$	247	$	4	$	27	$	278	$	274
Internal grade 2	4		923		250		1,177		—
Total notes receivable(b)	$	251	$	927	$	277	$	1,455	$	274
Net investment in leases
Internal grade 1	$	—	$	—	$	34	$	34	$	—
Internal grade 2	—		2		—		2		—
Total net investment in leases(b)	$	—	$	2	$	34	$	36	$	—

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(a)For DTE Electric, $247 million is included in Internal grade 1 with a 2025 year of origination.

(b)For DTE Energy, the current portion is included in Current Assets — Other on the Consolidated Statements of Financial Position. For DTE Electric, the amounts are included in Other Assets — Other on the Consolidated Statements of Financial Position.

Schedule of Roll-Forward of Activity for Financing Receivables Credit Loss Reserves

The following tables present a roll-forward of the activity for the Registrants' financing receivables credit loss reserves:

	DTE Energy						DTE Electric
	Trade accounts receivable		Other receivables(a)		Total		Trade and other accounts receivable
	(In millions)
Balance at December 31, 2022	$	78	$	1	$	79	$	49
Current period provision	52		—		52		36
Write-offs charged against allowance	(112)		—		(112)		(72)
Recoveries of amounts previously written off	44		—		44		28
Balance at December 31, 2023	$	62	$	1	$	63	$	41
Current period provision	74		2		76		49
Write-offs charged against allowance	(108)		—		(108)		(70)
Recoveries of amounts previously written off	41		—		41		26
Balance at December 31, 2024	$	69	$	3	$	72	$	46
Current period provision	69		—		69		44
Write-offs charged against allowance	(116)		—		(116)		(74)
Recoveries of amounts previously written off	37		—		37		25
Balance at December 31, 2025	$	59	$	3	$	62	$	41

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(a)Other receivables includes reserves on notes receivable and Accounts receivable — Other.

Schedule of Uncollectible Expense

Uncollectible expense for the Registrants is primarily comprised of the current period provision for allowance for doubtful accounts and is summarized as follows:

	Year Ended December 31,
	2025		2024		2023
	(In millions)
DTE Energy	$	70	$	74	$	55
DTE Electric	$	45	$	50	$	38

Schedule of Finite-Lived Intangible Assets

The Registrants have certain Intangible assets as shown below:

		December 31, 2025						December 31, 2024
	Useful Lives	Gross Carrying Value		Accumulated Amortization		Net Carrying Value		Gross Carrying Value		Accumulated Amortization		Net Carrying Value
		(In millions)
Intangible assets subject to amortization
Contract intangibles	5 to 39 years	$	306	$	(137)	$	169	$	246	$	(119)	$	127
Carbon offsets		16		—		16		14		—		14
Renewable energy credits		—		—		—		1		—		1
Other		3		—		3		2		—		2
Intangible assets not subject to amortization(a)		19		—		19		17		—		17
DTE Energy Long-term intangible assets		$	325	$	(137)	$	188	$	263	$	(119)	$	144

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(a)Amounts are charged to expense, using average cost, as they are consumed in the operation of the business. DTE Electric intangible assets include the Renewable energy credits above, which are included in Other Assets — Other on the DTE Electric Consolidated Statements of Financial Position.

Schedule of Indefinite-Lived Intangible Assets

The Registrants have certain Intangible assets as shown below:

		December 31, 2025						December 31, 2024
	Useful Lives	Gross Carrying Value		Accumulated Amortization		Net Carrying Value		Gross Carrying Value		Accumulated Amortization		Net Carrying Value
		(In millions)
Intangible assets subject to amortization
Contract intangibles	5 to 39 years	$	306	$	(137)	$	169	$	246	$	(119)	$	127
Carbon offsets		16		—		16		14		—		14
Renewable energy credits		—		—		—		1		—		1
Other		3		—		3		2		—		2
Intangible assets not subject to amortization(a)		19		—		19		17		—		17
DTE Energy Long-term intangible assets		$	325	$	(137)	$	188	$	263	$	(119)	$	144

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(a)Amounts are charged to expense, using average cost, as they are consumed in the operation of the business. DTE Electric intangible assets include the Renewable energy credits above, which are included in Other Assets — Other on the DTE Electric Consolidated Statements of Financial Position.

Schedule of Estimated Contract Intangible Amortization Expense

The following table summarizes DTE Energy's estimated contract intangible amortization expense expected to be recognized during each year through 2030:

	2026		2027		2028		2029		2030
	(In millions)
Estimated amortization expense	$	24	$	24	$	24	$	24	$	22

Schedule of Cloud Computing Costs

The following balances for cloud computing costs relate to DTE Energy:

	Year Ended December 31,
	2025		2024		2023
	(In millions)
Amortization expense of capitalized cloud computing costs	$	13	$	12	$	10
Gross value of capitalized cloud computing costs	$	94	$	64
Accumulated amortization of capitalized cloud computing costs	$	40	$	27

The following balances for cloud computing costs relate to DTE Electric:

	Year Ended December 31,
	2025		2024		2023
	(In millions)
Amortization expense of capitalized cloud computing costs	$	10	$	10	$	8
Gross value of capitalized cloud computing costs	$	69	$	51
Accumulated amortization of capitalized cloud computing costs	$	32	$	22

Schedule of Other Accounting Policies

See the following notes for other accounting policies impacting the Registrants’ Consolidated Financial Statements:

Note	Title
5	Revenue
6	Property, Plant, and Equipment
8	Asset Retirement Obligations
9	Regulatory Matters
10	Income Taxes
12	Fair Value
13	Financial and Other Derivative Instruments
17	Leases
20	Retirement Benefits and Trusteed Assets
21	Stock-Based Compensation
22	Segment and Related Information
23	Related Party Transactions