Significant Accounting Policies (Tables)

3 Months Ended

Mar. 31, 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:

	March 31,		December 31,
	2015		2014
	(In millions)
Emission allowances	$	1	$	1
Renewable energy credits	46		45
Contract intangible assets	123		122
	170		168
Less accumulated amortization	60		57
Intangible assets, net	110		111
Less current intangible assets	10		9
	$	100	$	102

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

	March 31,		December 31,
	2015		2014
	(In millions)
Emission allowances	$	1	$	1
Renewable energy credits	46		45
	47		46
Less current intangible assets	10		9
	$	37	$	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 March 31,				March 31,
	2015		2014		2015
					(In millions)
DTE Energy	31	%	33	%	$	9
DTE Electric	35	%	36	%	$	4