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Restructuring Program - Restructuring Liability Activity (Details) - Simplify to Grow Program - USD ($)
$ in Millions
12 Months Ended 56 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2018
Restructuring Cost and Reserve [Line Items]        
Liability balance, January 1 $ 464 $ 464    
Charges 316 535 $ 714 $ 2,550
Cash spent (310) (347)    
Non-cash settlements/adjustments (67) (215)    
Currency (30) 27    
Liability balance, December 31 373 464 464 373
Severance and related costs        
Restructuring Cost and Reserve [Line Items]        
Liability balance, January 1 464 464    
Charges 253 323    
Cash spent (310) (347)    
Non-cash settlements/adjustments (4) (3)    
Currency (30) 27    
Liability balance, December 31 373 464 464 373
Asset Write-downs        
Restructuring Cost and Reserve [Line Items]        
Liability balance, January 1 0 0    
Charges 63 212    
Cash spent 0 0    
Non-cash settlements/adjustments (63) (212)    
Currency 0 0    
Liability balance, December 31 $ 0 $ 0 $ 0 $ 0