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Summary of Significant Accounting Policies (Tables)
 12 Months Ended
Dec. 31, 2015
Organization, Consolidation and Presentation of Financial Statements [Abstract]  
Property, Plant and Equipment
Major classes of property, plant and equipment and their useful lives are as follows:
 
 
 
 
December 31
Useful life in years, $ in millions
 
Useful Life
 
2015
 
2014
Land and land improvements
 
   Up to 40(1)
 
$
381

 
$
373

Buildings and improvements
 
Up to 45
 
1,618

 
1,589

Machinery and other equipment
 
Up to 20
 
4,610

 
4,401

Capitalized software costs
 
3-5
 
406

 
428

Leasehold improvements
 
Length of Lease(2)
 
898

 
811

Property, plant and equipment, at cost
 
 
 
7,913

 
7,602

Accumulated depreciation
 
 
 
(4,849
)
 
(4,611
)
Property, plant and equipment, net
 
 
 
$
3,064

 
$
2,991


(1) 
Land is not a depreciable asset.
(2) 
Leasehold improvements are depreciated over the shorter of the useful life of the asset or the length of the lease.
Accumulated Other Comprehensive Loss
The components of accumulated other comprehensive loss are as follows:
 
 
December 31
$ in millions
 
2015
 
2014
Unamortized benefit plan costs, net of tax benefit of $3,350 in 2015 and $3,395 in 2014
 
$
(5,241
)
 
$
(5,316
)
Cumulative translation adjustment
 
(82
)
 
(41
)
Net unrealized gain on marketable securities and cash flow hedges, net of tax
 
3

 
1

Total accumulated other comprehensive loss
 
$
(5,320
)
 
$
(5,356
)