Regulatory Matters (Tables)

12 Months Ended

Dec. 31, 2015

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
	2015			2014			2015			2014
Assets	(In millions)
Recoverable pension and other postretirement costs:
Pension	$	2,112		$	2,284		$	1,592		$	1,743
Other postretirement costs	256			234			198			191
Asset retirement obligation	565			448			565			448
Recoverable Michigan income taxes	248			267			203			220
Removal costs asset	118			15			118			15
Unamortized loss on reacquired debt	63			67			41			44
Other recoverable income taxes	61			66			61			66
Deferred environmental costs	54			59			—			—
Transitional Reconciliation Mechanism	43			14			43			14
Cost to achieve Performance Excellence Process	33			54			28			46
Accrued PSCR/GCR revenue	12			61			—			34
Recoverable income taxes related to Securitized regulatory assets	—			19			—			19
Other	159			139			137			119
	3,724			3,727			2,986			2,959
Less amount included in Current Assets	(32		)	(76		)	(17		)	(46		)
	$	3,692		$	3,651		$	2,969		$	2,913
Securitized regulatory assets	$	—		$	34		$	—		$	34

Schedule of Regulatory Liabilities

	DTE Energy						DTE Electric
	2015			2014			2015			2014
Liabilities	(In millions)
Removal costs liability	$	291		$	308		$	—		$	—
Renewable energy	197			227			197			227
Negative pension offset	46			67			—			—
Accrued PSCR/GCR refund	37			—			15			—
Refundable income taxes	23			33			—			—
Energy optimization	10			24			—			14
Fermi 2 refueling outage	4			16			4			16
Securitization over recovery	—			71			—			71
Refundable revenue decoupling/deferred gain	—			63			—			63
Other	2			11			2			4
	$	610		$	820		$	218		$	395
Less amount included in Current Liabilities	(41		)	(153		)	(19		)	(150		)
	$	569		$	667		$	199		$	245