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Summary of Significant Accounting Policies (Tables)
 12 Months Ended
Dec. 31, 2012
Organization, Consolidation and Presentation of Financial Statements [Abstract]  
Property, Plant and Equipment, Estimated Useful Lives
Major classes of property, plant and equipment and their useful lives are as follows:
 
 
 
 
December 31
Useful life in years, $ in millions
 
Useful Life
 
2012
 
2011
Land and land improvements
 
Up to 40(1)
 

$ 373

 

$ 375

Buildings and improvements
 
Up to 45
 
1,421

 
1,433

Machinery and other equipment
 
Up to 20
 
4,233

 
4,143

Capitalized software costs
 
3-5
 
413

 
444

Leasehold improvements
 
Length of Lease(1)
 
593

 
585

Property, plant and equipment, cost
 
 
 
7,033

 
6,980

Accumulated depreciation
 
 
 
(4,146
)
 
(3,933
)
Property, plant and equipment, net
 
 
 

$2,887

 

$3,047


(1)
Land is not a depreciable asset. Leasehold improvements are depreciated over the useful life of the asset if it is shorter than the length of the lease.
Accumulated Other Comprehensive Loss
The components of accumulated other comprehensive loss are as follows:
 
 
December 31
$ in millions
 
2012
 
2011
Unamortized benefit plan costs, net of tax benefit of $3,149 in 2012 and $2,289 in 2011
 

($4,790
)
 

($3,487
)
Cumulative translation adjustment
 
4

 
(4
)
Net unrealized (loss) gain on marketable securities and cash flow hedges, net of tax expense of $0 in both 2012 and 2011
 
(1
)
 
1

Total accumulated other comprehensive loss
 

($4,787
)
 

($3,490
)