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Inventories (Tables)
3 Months Ended
Apr. 01, 2018
Inventory Disclosure [Abstract]  
Summary of Inventories
(Dollars in Millions)
 
April 1, 2018
 
December 31, 2017
Raw materials and supplies
 
$
1,200

 
1,140

Goods in process
 
2,339

 
2,317

Finished goods
 
5,475

 
5,308

Total inventories(1)
 
$
9,014

 
8,765