Regulatory Matters (Tables)

12 Months Ended

Dec. 31, 2018

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
	2018			2017			2018			2017
Assets	(In millions)
Recoverable pension and other postretirement costs
Pension	$	1,961		$	2,000		$	1,476		$	1,502
Other postretirement costs	213			278			121			211
Asset retirement obligation	778			569			778			569
Recoverable undepreciated costs on retiring plants	630			—			630			—
Removal costs asset	407			299			407			299
Recoverable Michigan income taxes	201			213			161			171
Accrued PSCR/GCR revenue	116			17			116			17
Deferred environmental costs	69			75			—			—
Unamortized loss on reacquired debt	60			65			43			46
Recoverable income taxes related to AFUDC equity	51			41			41			35
Energy Waste Reduction incentive	49			39			39			30
Nuclear Performance Evaluation and Review Committee Tracker	43			22			43			22
Customer360 deferred costs	42			45			42			45
Other recoverable income taxes	23			26			23			26
Transitional Reconciliation Mechanism	21			46			21			46
Other	57			43			36			36
	4,721			3,778			3,977			3,055
Less amount included in Current Assets	(153		)	(55		)	(148		)	(50		)
	$	4,568		$	3,723		$	3,829		$	3,005

Schedule of Regulatory Liabilities

	DTE Energy						DTE Electric
	2018			2017			2018			2017
Liabilities	(In millions)
Refundable federal income taxes	$	2,410		$	2,384		$	1,958		$	1,946
Removal costs liability	253			265			—			—
TCJA rate reduction liability	118			—			93			—
Negative other postretirement offset	101			80			79			67
Renewable energy	86			112			86			112
Refundable self-implemented rates	26			2			26			2
Negative pension offset	9			21			—			—
Fermi 2 refueling outage	4			15			4			15
Other	41			14			23			12
	3,048			2,893			2,269			2,154
Less amount included in Current Liabilities	(126		)	(18		)	(98		)	(17		)
	$	2,922		$	2,875		$	2,171		$	2,137