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Accounting Pronouncements (Narrative) (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Jan. 01, 2018
New Accounting Pronouncements or Change in Accounting Principle [Line Items]        
Cost of sales $ (5,183) $ (4,629) $ (3,984)  
Selling, General and Administrative Expense (546) (496) (378)  
Research and Development Expense (72) (73) (78)  
Other (charges) gains, net 9 (59) (8)  
Operating profit (loss) 1,334 857 934  
Non-operating pension and other postretirement employee benefit (expense) income (62) 44 (41)  
Retained earnings 5,847 4,920    
Previously Reported [Member]        
New Accounting Pronouncements or Change in Accounting Principle [Line Items]        
Cost of sales   (4,625)    
Selling, General and Administrative Expense   (456) (416)  
Research and Development Expense   (72)    
Other (charges) gains, net   (60) (11)  
Operating profit (loss)   901 893  
Non-operating pension and other postretirement employee benefit (expense) income   0 0  
Accounting Standards Update 2017-07 [Member]        
New Accounting Pronouncements or Change in Accounting Principle [Line Items]        
Selling, General and Administrative Expense     38  
Other (charges) gains, net     3  
Operating profit (loss)     41  
Non-operating pension and other postretirement employee benefit (expense) income     $ (41)  
Accounting Standards Update 2017-07 [Member] | Restatement Adjustment [Member]        
New Accounting Pronouncements or Change in Accounting Principle [Line Items]        
Cost of sales   (4)    
Selling, General and Administrative Expense   (40)    
Research and Development Expense   (1)    
Other (charges) gains, net   1    
Operating profit (loss)   (44)    
Non-operating pension and other postretirement employee benefit (expense) income   $ 44    
Accounting Standards Update 2016-02 [Member]        
New Accounting Pronouncements or Change in Accounting Principle [Line Items]        
Operating lease, liability 225      
Operating lease, right-of-use asset $ 225      
Accounting Standards Update 2016-01 [Member]        
New Accounting Pronouncements or Change in Accounting Principle [Line Items]        
Cumulative effect of new accounting principle in period of adoption       $ 1
Accounting Standards Update 2014-09 [Member] | Difference between Revenue Guidance in Effect before and after Topic 606 [Member]        
New Accounting Pronouncements or Change in Accounting Principle [Line Items]        
Retained earnings       $ 1