Significant Accounting Policies (Tables)

6 Months Ended

Jun. 30, 2015

Accounting Policies [Abstract]

Schedule of Finite-Lived Intangible Assets

DTE Energy has certain intangible assets relating to emission allowances, renewable energy credits and non-utility contracts as shown below:

	June 30,		December 31,
	2015		2014
	(In millions)
Emission allowances	$	1	$	1
Renewable energy credits	48		45
Contract intangible assets	109		122
	158		168
Less accumulated amortization	57		57
Intangible assets, net	101		111
Less current intangible assets	11		9
	$	90	$	102

DTE Electric has certain intangible assets relating to emission allowances and renewable energy credits as shown below:

	June 30,		December 31,
	2015		2014
	(In millions)
Emission allowances	$	1	$	1
Renewable energy credits	48		45
	49		46
Less current intangible assets	11		9
	$	38	$	37

Schedule of Effective Tax Rate and Unrecognized Tax Benefits

The effective tax rate and unrecognized tax benefits of the Registrants are as follows:

	Effective Tax Rate								Unrecognized Tax Benefits
	Three Months Ended June 30,				Six Months Ended June 30,				June 30,
	2015		2014		2015		2014		2015
									(In millions)
DTE Energy	20	%	28	%	28	%	31	%	$	9
DTE Electric	35	%	37	%	35	%	37	%	$	4