Significant Accounting Policies (Tables)

9 Months Ended

Sep. 30, 2017

Accounting Policies [Abstract]

Schedule of Other Income

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

	Three Months Ended September 30,				Nine Months Ended September 30,
	2017		2016		2017		2016
	(In millions)
Equity earnings of equity method investees	$	26	$	14	$	77	$	49
Income from REF entities	20		20		60		59
Gains from trading securities	6		5		19		15
Allowance for equity funds used during construction	5		5		17		15
Contract services	9		5		17		16
Other	8		2		14		6
	$	74	$	51	$	204	$	160

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

	Three Months Ended September 30,				Nine Months Ended September 30,
	2017		2016		2017		2016
	(In millions)
Gains from trading securities allocated from DTE Energy	$	6	$	5	$	19	$	15
Contract services	9		5		18		16
Allowance for equity funds used during construction	4		4		14		13
Equity earnings of equity method investees	—		—		1		1
Other	2		1		5		3
	$	21	$	15	$	57	$	48

Schedule of Effective Tax Rate

The effective tax rate of the Registrants are as follows:

	Effective Tax Rate
	Three Months Ended September 30,				Nine Months Ended September 30,
	2017		2016		2017		2016
DTE Energy	22	%	25	%	22	%	25	%
DTE Electric	35	%	35	%	35	%	36	%