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Property, Plant, and Equipment (Tables)
 12 Months Ended
Dec. 31, 2015
Property, Plant and Equipment [Abstract]  
PP&E by Classification, Summary of Depreciation and Amortization
The following is a summary of Property, plant, and equipment by classification as of December 31:
 
2015
 
2014
Property, plant, and equipment
(In millions)
DTE Electric
 
 
 
Generation
$
11,767

 
$
10,712

Distribution
7,816

 
7,414

Other
1,808

 
1,679

Total DTE Electric
21,391


19,805

DTE Gas
 
 
 
Distribution
3,124

 
2,946

Storage
453

 
448

Transmission and other
890

 
863

Total DTE Gas
4,467

 
4,257

Non-utility and other
2,263

 
2,476

Total DTE Energy
28,121

 
26,538

Less accumulated depreciation and amortization
 
 
 
DTE Electric
 
 
 
Generation
(4,346
)
 
(3,863
)
Distribution
(2,707
)
 
(2,822
)
Other
(593
)
 
(531
)
Total DTE Electric
(7,646
)
 
(7,216
)
DTE Gas
 
 
 
Distribution
(1,163
)
 
(1,130
)
Storage
(147
)
 
(142
)
Transmission and other
(370
)
 
(363
)
Total DTE Gas
(1,680
)
 
(1,635
)
Non-utility and other
(761
)
 
(867
)
Total DTE Energy
(10,087
)
 
(9,718
)
Net DTE Energy Property, plant, and equipment
$
18,034

 
$
16,820

Net DTE Electric Property, plant, and equipment
$
13,745

 
$
12,589

The following is a summary of Depreciation and amortization expense for DTE Energy, including DTE Electric:
 
2015
 
2014
 
2013
 
(In millions)
Property, plant, and equipment
$
740

 
$
683

 
$
630

Regulatory assets and liabilities
150

 
159

 
163

Securitized regulatory assets (a)
(38
)
 
303

 
301

 
$
852

 
$
1,145

 
$
1,094

The following is a summary of Depreciation and amortization expense for DTE Electric:
 
2015
 
2014
 
2013
 
(In millions)
Property, plant, and equipment
$
545

 
$
489

 
$
457

Regulatory assets and liabilities
126

 
135

 
138

Securitized regulatory assets (a)
(38
)
 
303

 
301

 
$
633

 
$
927

 
$
896

_______________________________________
(a)
Securitization surcharges ended in December 2014 with remaining over recovery refunded to customers in 2015. Securitization bonds were paid and Securitization regulatory assets amortization was completed in 2015. The $38 million credit represents the final adjustments to close out the Securitization program.
Schedule of Utility Property, Plant, and Equipment
The average estimated useful life for each major class of utility Property, plant, and equipment as of December 31, 2015 follows:
 
 
Estimated Useful Lives in Years
Utility
 
Generation
 
Distribution
 
Storage
DTE Electric
 
40
 
41
 
N/A
DTE Gas
 
N/A
 
50
 
53
Schedule of Capitalized Software
The following balances for capitalized software relate to DTE Energy, including DTE Electric:
 
Year Ended December 31,
 
2015
 
2014
 
2013
 
(In millions)
Amortization expense of capitalized software
$
98

 
$
77

 
$
71

Gross carrying value of capitalized software
$
770

 
$
668

 
 
Accumulated amortization of capitalized software
$
439

 
$
335

 
 
The following balances for capitalized software relate to DTE Electric:
 
Year Ended December 31,
 
2015
 
2014
 
2013
 
(In millions)
Amortization expense of capitalized software
$
80

 
$
71

 
$
64

Gross carrying value of capitalized software
$
664

 
$
590

 
 
Accumulated amortization of capitalized software
$
369

 
$
293

 
 
Schedule of Capital Leased Assets
Property under capital leases for the Registrants is as follows:
 
DTE Energy
 
DTE Electric
 
2015
 
2014
 
2015
 
2014
 
(In millions)
Gross property under capital leases
$
48

 
$
35

 
$
22

 
$
9

Accumulated amortization of property under capital leases
$
26

 
$
27

 
$
1

 
$
5