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Property, Plant and Equipment (Notes)
 12 Months Ended
Dec. 31, 2013
Property, Plant and Equipment [Abstract]  
Property, Plant and Equipment Disclosure [Text Block]
PROPERTY, PLANT AND EQUIPMENT

Summary of property by classification as of December 31:
 
2013
 
2012
 
(In millions)
Property, Plant and Equipment
 
 
 
Generation
$
11,127

 
$
10,383

Distribution
7,603

 
7,306

Total
18,730

 
17,689

Less Accumulated Depreciation and Amortization
 
 
 
Generation
(4,004
)
 
(3,880
)
Distribution
(2,947
)
 
(2,837
)
Total
(6,951
)
 
(6,717
)
Net Property, Plant and Equipment
$
11,779

 
$
10,972



The Allowance for Funds used During Construction (AFUDC) capitalized was approximately $21 million and $19 million during 2013 and 2012, respectively.

The composite depreciation rate for DTE Electric was approximately 3.4% in 2013 and 3.3% 2012 and 2011.

The average estimated useful life for our generation and distribution property was 40 years and 41 years, respectively, at December 31, 2013.

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 $64 million in 2013, $62 million in 2012 and $58 million in 2011. The gross carrying amount and accumulated amortization of capitalized software costs at December 31, 2013 were $572 million and $323 million, respectively. The gross carrying amount and accumulated amortization of capitalized software costs at December 31, 2012 were $515 million and $259 million, respectively.

Gross property under capital leases was $9 million and $6 million at December 31, 2013 and 2012, respectively. Accumulated amortization of property under capital leases was $1 million and $3 million at December 31, 2013 and 2012, respectively.