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Fixed Assets (Tables)
 12 Months Ended
Dec. 31, 2018
Property, Plant and Equipment [Abstract]  
Fixed Assets [Text Block]
(dollars in millions)
Estimated
Useful Lives

2018

2017
Land
 

$
425


$
412

Buildings and improvements
12-40 years

6,486


5,727

Machinery, tools and equipment
3-20 years

15,119


13,476

Other, including assets under construction
 

2,054


1,749

 
 

24,084


21,364

Accumulated depreciation
 

(11,787
)

(11,178
)
 
 

$
12,297


$
10,186