XML 88 R12.htm IDEA: XBRL DOCUMENT v2.4.1.9
Property, Plant and Equipment (Notes)
 12 Months Ended
Dec. 31, 2014
Property, Plant and Equipment [Abstract]  
Property, Plant and Equipment
PROPERTY, PLANT AND EQUIPMENT
Summary of property by classification as of December 31:
 
December 31,
 
2014
 
2013
 
(In millions)
Property, Plant and Equipment
 
 
 
Generation
$
11,641

 
$
11,127

Distribution
8,164

 
7,603

Total
19,805

 
18,730

Less Accumulated Depreciation and Amortization
 
 
 
Generation
(4,149
)
 
(4,004
)
Distribution
(3,067
)
 
(2,947
)
Total
(7,216
)
 
(6,951
)
Net Property, Plant and Equipment
$
12,589

 
$
11,779


AFUDC capitalized was approximately $32 million and $21 million for the years ended December 31, 2014 and 2013, respectively.
The composite depreciation rate for DTE Electric was approximately 3.4% in 2014 and 2013 and 3.3% in 2012.
The average estimated useful life for our generation and distribution property was 40 years and 41 years, respectively, at December 31, 2014.
Capitalized software costs are classified as Property, plant and equipment and the related amortization is included in Accumulated depreciation and amortization on the Consolidated Statements of Financial Position. The Company capitalizes the costs associated with computer software it develops or obtains for use in its business. The Company amortizes capitalized software costs on a straight-line basis over the expected period of benefit, ranging from 5 to 15 years.
Capitalized software costs amortization expense was $71 million in 2014, $64 million in 2013 and $62 million in 2012. The gross carrying amount and accumulated amortization of capitalized software costs at December 31, 2014 were $590 million and $293 million, respectively. The gross carrying amount and accumulated amortization of capitalized software costs at December 31, 2013 were $521 million and $269 million, respectively.
Gross property under capital leases was $9 million at December 31, 2014 and 2013. Accumulated amortization of property under capital leases was $5 million and $1 million at December 31, 2014 and 2013, respectively.