Income Taxes (Tables)

12 Months Ended

Dec. 31, 2016

Income Tax Disclosure [Abstract]

Schedule of Effective Income Tax Rate Reconciliation

The Registrants' total Income Tax Expense varied from the statutory federal income tax rate for the following reasons:

	2016			2015			2014
DTE Energy	(In millions)
Income Before Income Taxes	$	1,105		$	950		$	1,275
Income tax expense at 35% statutory rate	$	387		$	333		$	446
Production tax credits	(145		)	(122		)	(119		)
Investment tax credits	(5		)	(7		)	(6		)
Depreciation	(4		)	(4		)	(4		)
Noncontrolling Interests	12			2			(2		)
AFUDC Equity	(10		)	(8		)	(7		)
Employee Stock Ownership Plan dividends	(5		)	(5		)	(4		)
Subsidiary stock loss	(10		)	—			—
State and local income taxes, net of federal benefit	58			35			51
Enactment of New York Corporate Income Tax Legislation, net of federal benefit	—			—			8
Other, net	(7		)	6			1
Income Tax Expense	$	271		$	230		$	364
Effective income tax rate	24.5		%	24.2		%	28.5		%

	2016			2015			2014
DTE Electric	(In millions)
Income Before Income Taxes	$	975		$	836		$	830
Income tax expense at 35% statutory rate	$	341		$	293		$	291
Production tax credits	(30		)	(31		)	(22		)
Investment tax credits	(4		)	(5		)	(5		)
Depreciation	3			3			3
AFUDC Equity	(6		)	(7		)	(7		)
Employee Stock Ownership Plan dividends	(3		)	(3		)	(3		)
Domestic production activities deduction	—			—			(2		)
State and local income taxes, net of federal benefit	56			43			43
Other, net	(4		)	(1		)	—
Income Tax Expense	$	353		$	292		$	298
Effective income tax rate	36.2		%	34.9		%	35.9		%

Schedule of Components of Income Tax Expense (Benefit)

Components of the Registrants' Income Tax Expense were as follows:

	2016			2015			2014
DTE Energy	(In millions)
Current income tax expense (benefit)
Federal	$	(1	)	$	(3	)	$	(16	)
State and other income tax	7			(4		)	24
Total current income taxes	6			(7		)	8
Deferred income tax expense
Federal	184			178			289
State and other income tax	81			59			67
Total deferred income taxes	265			237			356
	$	271		$	230		$	364

	2016		2015			2014
DTE Electric	(In millions)
Current income tax expense (benefit)
Federal	$	—	$	(26	)	$	(19	)
State and other income tax	11		(2		)	20
Total current income taxes	11		(28		)	1
Deferred income tax expense
Federal	268		252			251
State and other income tax	74		68			46
Total deferred income taxes	342		320			297
	$	353	$	292		$	298

Schedule of Deferred Tax Assets and Liabilities

The Registrants' deferred tax assets (liabilities) were comprised of the following at December 31:

	DTE Energy						DTE Electric
	2016			2015			2016			2015
	(In millions)
Property, plant, and equipment	$	(4,596	)	$	(4,211	)	$	(3,702	)	$	(3,468	)
Securitized regulatory assets	—			5			—			5
Tax credit carry-forwards	643			465			116			53
Pension and benefits	(324		)	(301		)	(222		)	(193		)
Federal net operating loss carry-forward	190			177			42			142
State and local net operating loss carry-forwards	59			63			1			16
Investments in equity method investees	(109		)	(82		)	—			—
Other	11			(4		)	(28		)	(53		)
	(4,126		)	(3,888		)	(3,793		)	(3,498		)
Less valuation allowance	(36		)	(35		)	—			—
Long-term deferred income tax liabilities	$	(4,162	)	$	(3,923	)	$	(3,793	)	$	(3,498	)
Deferred income tax assets	$	1,463		$	1,088		$	569		$	453
Deferred income tax liabilities	(5,625		)	(5,011		)	(4,362		)	(3,951		)
	$	(4,162	)	$	(3,923	)	$	(3,793	)	$	(3,498	)

Schedule of Unrecognized Tax Benefits Roll Forward

A reconciliation of the beginning and ending amount of unrecognized tax benefits for the Registrants is as follows:

	2016		2015			2014
DTE Energy	(In millions)
Balance at January 1	$	3	$	9		$	10
Additions for tax positions of prior years	7		—			—
Lapse of statute of limitations	—		(6		)	(1		)
Balance at December 31	$	10	$	3		$	9

	2016		2015		2014
DTE Electric	(In millions)
Balance at January 1	$	4	$	4	$	4
Additions for tax positions of prior years	9		—		—
Balance at December 31	$	13	$	4	$	4