Regulatory Matters (Tables)

12 Months Ended

Dec. 31, 2025

Regulatory Assets and Liabilities Disclosure [Abstract]

Schedule of Regulatory Assets

The following are balances and a brief description of the Registrants' Regulatory assets and liabilities at December 31:

	DTE Energy				DTE Electric
	2025		2024		2025		2024
Assets	(In millions)
Recoverable undepreciated costs on retiring plants	$	3,146	$	2,986	$	3,146	$	2,986
Recoverable pension and other postretirement costs
Pension	1,281		1,315		949		971
Other postretirement costs	90		91		—		—
Fermi 2 asset retirement obligation	895		951		895		951
Removal costs asset	700		501		700		501
Enhanced tree trimming program deferred costs	340		211		340		211
Renewable ITC offset	207		89		207		89
Recoverable income taxes related to AFUDC equity	148		116		139		107
Energy Waste Reduction incentive	115		102		94		82
Accrued PSCR/GCR revenue	112		—		111		—
Recoverable Michigan income taxes	107		119		89		99
Ludington contract dispute costs	58		31		58		31
Energy Waste Reduction	57		36		52		29
Deferred environmental costs	39		43		—		—
Unamortized loss on reacquired debt	33		38		26		29
Customer360 deferred costs	29		34		29		34
Other	193		158		144		106
	7,550		6,821		6,979		6,226
Less amount included in Current Assets	(170)		(50)		(158)		(39)
	$	7,380	$	6,771	$	6,821	$	6,187
Securitized regulatory assets	$	619	$	690	$	619	$	690

Schedule of Regulatory Liabilities

	DTE Energy				DTE Electric
	2025		2024		2025		2024
Liabilities	(In millions)
Refundable federal income taxes	$	1,646	$	1,733	$	1,318	$	1,389
Removal costs liability	511		506		—		—
Non-service pension and other postretirement costs	271		255		103		94
Negative other postretirement offset	205		214		133		139
Renewable energy	196		90		196		90
Accrued PSCR/GCR refund	43		136		—		111
Other	116		103		111		86
	2,988		3,037		1,861		1,909
Less amount included in Current Liabilities	(107)		(181)		(63)		(156)
	$	2,881	$	2,856	$	1,798	$	1,753