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Property, Plant And Equipment
 6 Months Ended
Jun. 30, 2016
Property, Plant And Equipment [Abstract]  
Property, Plant And Equipment

(5)   Property, Plant and Equipment:

Property, plant and equipment, net is as follows:







 

 

 

 

 

 



 

 

 

 

 

 

($ in millions)

 

June 30, 2016

 

December 31, 2015

    

 

 

 

 

 

 

Property, plant and equipment

 

$ 

 26,140 

 

$

 17,801 

Less:  Accumulated depreciation

 

 

 (9,979)

 

 

 (9,308)

Property, plant and equipment, net

 

$

 16,161 

 

$

 8,493 





Depreciation expense is principally based on the composite group method. Depreciation expense was as follows:







 

 

 

 

 

 

 

 

 

 

 

 



 

For the three months ended June 30,

 

For the six months ended June 30,

($ in millions)

 

2016

 

2015

 

2016

 

2015



 

 

 

 

 

 

 

 

 

 

 

 

Depreciation expense

 

$

 446 

 

$

 247 

 

$

 686 

 

$

 496 



 

 

 

 

 

 

 

 

 

 

 

 



We adopted new estimated remaining useful lives for certain plant assets as of October 1, 2015, as a result of an annual independent study of the estimated remaining useful lives of our plant assets, with an insignificant impact to depreciation expense. In addition, the estimated useful lives for assets acquired in the Verizon Acquisition were adopted for such assets based on this same study effective April 1, 2016.