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2014-2018 Restructuring Program - Restructuring Liability Activity (Details) - 2014-2018 Restructuring Program - USD ($)
$ in Millions
3 Months Ended 47 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Mar. 31, 2018
Restructuring Reserve [Roll Forward]      
Liability balance, January 1, 2018 $ 464    
Charges 52 $ 157 $ 2,286 [1]
Cash spent (79) (84)  
Non-cash settlements/adjustments (25) $ (72)  
Currency 4    
Liability balance, March 31, 2018 416   416
Severance and related costs      
Restructuring Reserve [Roll Forward]      
Liability balance, January 1, 2018 464    
Charges 28    
Cash spent (79)    
Non-cash settlements/adjustments (1)    
Currency 4    
Liability balance, March 31, 2018 416   416
Asset Write-downs      
Restructuring Reserve [Roll Forward]      
Liability balance, January 1, 2018 0    
Charges 24    
Cash spent 0    
Non-cash settlements/adjustments (24)    
Currency 0    
Liability balance, March 31, 2018 $ 0   $ 0
[1] Includes all charges recorded since program inception on May 6, 2014 through March 31, 2018.