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Property, Plant, and Equipment (Tables)
 12 Months Ended
Dec. 31, 2016
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:
 
2016
 
2015
Property, plant, and equipment
(In millions)
DTE Electric
 
 
 
Generation
$
11,990

 
$
11,767

Distribution
8,134

 
7,816

Other
1,970

 
1,808

Total DTE Electric
22,094


21,391

DTE Gas
 
 
 
Distribution
3,382

 
3,124

Storage
503

 
453

Transmission and other
925

 
890

Total DTE Gas
4,810

 
4,467

Non-utility and other
3,125

 
2,263

Total DTE Energy
30,029

 
28,121

Accumulated depreciation and amortization
 
 
 
DTE Electric
 
 
 
Generation
(4,364
)
 
(4,346
)
Distribution
(2,769
)
 
(2,707
)
Other
(588
)
 
(593
)
Total DTE Electric
(7,721
)
 
(7,646
)
DTE Gas
 
 
 
Distribution
(1,198
)
 
(1,163
)
Storage
(152
)
 
(147
)
Transmission and other
(370
)
 
(370
)
Total DTE Gas
(1,720
)
 
(1,680
)
Non-utility and other
(858
)
 
(761
)
Total DTE Energy
(10,299
)
 
(10,087
)
Net DTE Energy Property, plant, and equipment
$
19,730

 
$
18,034

Net DTE Electric Property, plant, and equipment
$
14,373

 
$
13,745

The following is a summary of Depreciation and amortization expense for DTE Energy, including DTE Electric:
 
2016
 
2015
 
2014
 
(In millions)
Property, plant, and equipment
$
783

 
$
740

 
$
683

Regulatory assets and liabilities
193

 
150

 
159

Securitized regulatory assets(a)
—

 
(38
)
 
303

 
$
976

 
$
852

 
$
1,145

_______________________________________
(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.
The following is a summary of Depreciation and amortization expense for DTE Electric:
 
2016
 
2015
 
2014
 
(In millions)
Property, plant, and equipment
$
582

 
$
545

 
$
489

Regulatory assets and liabilities
168

 
126

 
135

Securitized regulatory assets(a)
—

 
(38
)
 
303

 
$
750

 
$
633

 
$
927

_______________________________________
(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 AFUDC and Interest Capitalized
The following is a summary of the Registrants' AFUDC and interest capitalized for the years ended December 31:
 
DTE Energy
 
DTE Electric
 
2016
 
2015
 
2016
 
2015
 
(In millions)
Allowance for debt funds used during construction and interest capitalized
$
10

 
$
13

 
$
8

 
$
11

Allowance for equity funds used during construction
21

 
21

 
18

 
20

Total
$
31

 
$
34

 
$
26

 
$
31
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, 2016 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,
 
2016
 
2015
 
2014
 
(In millions)
Amortization expense of capitalized software
$
89

 
$
98

 
$
77

Gross carrying value of capitalized software
$
715

 
$
770

 
 
Accumulated amortization of capitalized software
$
435

 
$
439

 
 
The following balances for capitalized software relate to DTE Electric:
 
Year Ended December 31,
 
2016
 
2015
 
2014
 
(In millions)
Amortization expense of capitalized software
$
83

 
$
80

 
$
71

Gross carrying value of capitalized software
$
610

 
$
664

 
 
Accumulated amortization of capitalized software
$
365

 
$
369

 
 
Schedule of Capital Leased Assets
Property under capital leases for the Registrants is as follows:
 
DTE Energy
 
DTE Electric
 
2016
 
2015
 
2016
 
2015
 
(In millions)
Gross property under capital leases
$
44

 
$
48

 
$
18

 
$
22

Accumulated amortization of property under capital leases
$
32

 
$
26

 
$
6

 
$
1