Regulatory Matters (Tables)

12 Months Ended

Dec. 31, 2016

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
	2016			2015			2016			2015
Assets	(In millions)
Recoverable pension and other postretirement costs
Pension	$	2,159		$	2,112		$	1,642		$	1,592
Other postretirement costs	286			256			207			198
Asset retirement obligation	613			565			613			565
Recoverable Michigan income taxes	231			248			187			203
Removal costs asset	193			118			193			118
Deferred environmental costs	78			54			—			—
Recoverable income taxes related to AFUDC equity	59			49			53			44
Unamortized loss on reacquired debt	59			63			39			41
Other recoverable income taxes	57			61			57			61
Customer360 deferred costs	33			16			33			16
Transitional Reconciliation Mechanism	30			43			30			43
Accrued PSCR/GCR revenue	22			12			19			—
Cost to achieve Performance Excellence Process	12			33			10			28
Other	81			94			66			77
	3,913			3,724			3,149			2,986
Less amount included in Current Assets	(42		)	(32		)	(36		)	(17		)
	$	3,871		$	3,692		$	3,113		$	2,969

Schedule of Regulatory Liabilities

	DTE Energy						DTE Electric
	2016			2015			2016			2015
Liabilities	(In millions)
Removal costs liability	$	266		$	291		$	—		$	—
Renewable energy	145			197			145			197
Negative other postretirement offset	56			—			55			—
Negative pension offset	36			46			—			—
Fermi 2 refueling outage	27			4			27			4
Refundable self-implemented rates	27			—			27			—
Refundable income taxes	11			23			—			—
Accrued PSCR/GCR refund	7			37			—			15
Energy optimization	4			10			—			—
Other	10			2			2			2
	589			610			256			218
Less amount included in Current Liabilities	(34		)	(41		)	(27		)	(19		)
	$	555		$	569		$	229		$	199