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Revenue (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2018
Jun. 30, 2018
Jan. 01, 2018
Dec. 31, 2017
Revenue, Initial Application Period Cumulative Effect Transition        
Retained earnings $ 39,442 $ 39,442   $ 39,115
Contract Balance        
Current deferred income balances 512 512   $ 513
Net Sales 8,390 $ 16,668    
Exemptions and Practical Expedients Applied or Elected        
Practical Expedient, unfulfilled performance obligation   true    
Practical Expedient, relative to costs of obtaining a contract   true    
Difference between Revenue Guidance in Effect before and after Topic 606 | Maximum        
Revenue, Initial Application Period Cumulative Effect Transition        
Retained earnings     $ 2  
ASU 2014-09 Revenue from Contracts with Customers | Difference between Revenue Guidance in Effect before and after Topic 606        
Contract Balance        
Net Sales $ 110 $ 390