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Significant Accounting Policies (Narrative) (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2018
Jan. 01, 2018
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Accounting Standards Update 2018-11          
Right-of-use asset $ 350        
Operating lease, liability $ 350        
Retained Earnings          
Cumulative-effect adjustment on retained earnings     $ (759) $ 0 $ 0
Retained Earnings | Accounting Standards Update 2016-16          
Cumulative-effect adjustment on retained earnings   $ (695)      
Employee Stock Option          
Vesting period 10 years        
Restricted Stock Units (RSUs)          
Performance period 3 years        
Performance Stock Units (PSUs)          
Vesting period 3 years        
Minimum          
Finite-lived intangible asset, useful life 4 years        
Maximum          
Finite-lived intangible asset, useful life 40 years        
Building and Improvements | Minimum          
Property, plant and equipment useful life 3 years        
Building and Improvements | Maximum          
Property, plant and equipment useful life 30 years        
Machinery and Equipment | Minimum          
Property, plant and equipment useful life 3 years        
Machinery and Equipment | Maximum          
Property, plant and equipment useful life 10 years