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Restructuring Program - Restructuring Liability Activity (Details) - Simplify to Grow Program - USD ($)
$ in Millions
12 Months Ended 80 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2020
Restructuring Cost and Reserve [Line Items]        
Liability Balance, January 1 $ 301 $ 373    
Charges 156 176 $ 316 $ 2,882
Cash spent (169) (162)    
Non-cash settlements   (82)    
Non-cash adjustments 6      
Currency 10 (4)    
Liability Balance, December 31 304 301 373 304
Severance and related costs        
Restructuring Cost and Reserve [Line Items]        
Liability Balance, January 1 301 373    
Charges 168 125    
Cash spent (169) (162)    
Non-cash settlements (6) (31)    
Currency 10 (4)    
Liability Balance, December 31 304 301 373 304
Asset write-down and other        
Restructuring Cost and Reserve [Line Items]        
Liability Balance, January 1 [1] 0 0    
Charges [1] (12) 51    
Cash spent [1] 0 0    
Non-cash settlements [1]   (51)    
Non-cash adjustments [1] 12      
Currency [1] 0 0    
Liability Balance, December 31 [1] $ 0 $ 0 $ 0 $ 0
[1] Includes gains as a result of assets sold which are included in the restructuring program