Regulatory Matters (Tables)

12 Months Ended

Dec. 31, 2020

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
	2020		2019		2020		2019
Assets	(In millions)
Recoverable pension and other postretirement costs
Pension	$	1,938	$	1,983	$	1,477	$	1,497
Other postretirement costs	165		201		108		131
Recoverable undepreciated costs on retiring plants	664		657		664		657
Fermi 2 asset retirement obligation	645		669		645		669
Recoverable Michigan income taxes	176		189		142		152
Enhanced Tree Trimming Program deferred costs	119		43		119		43
Accrued PSCR revenue	100		3		100		3
Recoverable income taxes related to AFUDC equity	64		56		54		47
Energy Waste Reduction incentive	62		54		49		43
Deferred environmental costs	57		66		—		—
Unamortized loss on reacquired debt	55		56		41		40
Nuclear Performance Evaluation and Review Committee Tracker	55		48		55		48
Customer360 deferred costs	51		55		51		55
Non-service pension and other postretirement costs	21		15		—		—
Other recoverable income taxes	19		20		19		20
Transitional Reconciliation Mechanism	11		10		11		10
Other	55		51		28		38
	4,257		4,176		3,563		3,453
Less amount included in Current Assets	(129)		(5)		(123)		(5)
	$	4,128	$	4,171	$	3,440	$	3,448

Schedule of Regulatory Liabilities

	DTE Energy				DTE Electric
	2020		2019		2020		2019
Liabilities	(In millions)
Refundable federal income taxes	$	2,255	$	2,359	$	1,827	$	1,911
Removal costs liability	831		700		410		483
Negative other postretirement offset	122		93		86		69
Non-service pension and other postretirement costs	78		46		36		21
COVID-19 voluntary refund	30		—		30		—
Renewable energy	21		54		21		54
Accrued GCR refund	20		23		—		—
Other	45		54		40		48
	3,402		3,329		2,450		2,586
Less amount included in Current Liabilities	(39)		(65)		(18)		(40)
	$	3,363	$	3,264	$	2,432	$	2,546