Regulatory Matters (Tables)

12 Months Ended

Dec. 31, 2021

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
	2021		2020		2021		2020
Assets	(In millions)
Recoverable pension and other postretirement costs
Pension	$	1,372	$	1,938	$	1,056	$	1,477
Other postretirement costs	53		165		27		108
Recoverable undepreciated costs on retiring plants	667		664		667		664
Fermi 2 asset retirement obligation	613		645		613		645
Enhanced Tree Trimming Program deferred costs	189		119		189		119
Recoverable Michigan income taxes	163		176		133		142
Accrued PSCR/GCR revenue	160		100		142		100
Energy Waste Reduction incentive	79		62		63		49
Recoverable income taxes related to AFUDC equity	68		64		61		54
Deferred environmental costs	51		57		—		—
Unamortized loss on reacquired debt	51		55		38		41
Customer360 deferred costs	46		51		46		51
Nuclear Performance Evaluation and Review Committee Tracker	39		55		39		55
Non-service pension and other postretirement costs	25		21		—		—
Energy Waste Reduction	20		19		—		—
Other recoverable income taxes	16		19		16		19
Transitional Reconciliation Mechanism	8		11		8		11
Other	57		33		38		28
	3,677		4,254		3,136		3,563
Less amount included in Current Assets	(195)		(129)		(168)		(123)
	$	3,482	$	4,125	$	2,968	$	3,440

Schedule of Regulatory Liabilities

	DTE Energy				DTE Electric
	2021		2020		2021		2020
Liabilities	(In millions)
Refundable federal income taxes	$	2,117	$	2,255	$	1,729	$	1,827
Removal costs liability	679		831		283		410
Negative other postretirement offset	150		122		106		86
Non-service pension and other postretirement costs	110		78		54		36
Incremental tree trim surge	90		—		90		—
COVID-19 voluntary refund	30		30		30		30
Energy Waste Reduction	27		15		27		15
Renewable energy	13		21		13		21
Other	46		50		43		25
	3,262		3,402		2,375		2,450
Less amount included in Current Liabilities	(156)		(39)		(154)		(18)
	$	3,106	$	3,363	$	2,221	$	2,432