Significant Accounting Policies (Tables)

6 Months Ended

Jun. 30, 2017

Accounting Policies [Abstract]

Schedule of Other Nonoperating Income, by Component

The following is a summary of DTE Energy's Other income:

	Three Months Ended June 30,				Six Months Ended June 30,
	2017		2016		2017		2016
	(In millions)
Equity earnings of equity method investees	$	25	$	20	$	51	$	35
Income from REF entities	22		20		40		39
Gains from trading securities	5		5		13		10
Allowance for equity funds used during construction	5		5		12		10
Contract services	4		5		8		11
Other	5		2		6		4
	$	66	$	57	$	130	$	109

The following is a summary of DTE Electric's Other income:

	Three Months Ended June 30,				Six Months Ended June 30,
	2017		2016		2017		2016
	(In millions)
Gains from trading securities allocated from DTE Energy	$	5	$	5	$	13	$	10
Contract services	5		5		9		11
Allowance for equity funds used during construction	4		5		10		9
Equity earnings of equity method investees	1		1		1		1
Other	2		1		3		2
	$	17	$	17	$	36	$	33

Schedule of Effective Tax Rate

The effective tax rate of the Registrants are as follows:

	Effective Tax Rate
	Three Months Ended June 30,				Six Months Ended June 30,
	2017		2016		2017		2016
DTE Energy	25	%	26	%	23	%	26	%
DTE Electric	35	%	36	%	35	%	36	%