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Restructuring and Related Implementation Charges - Narrative (Details)
$ in Millions
3 Months Ended 12 Months Ended
Dec. 31, 2020
USD ($)
Dec. 31, 2020
USD ($)
case
Dec. 31, 2019
USD ($)
Dec. 31, 2018
USD ($)
Dec. 31, 2017
USD ($)
Restructuring Cost and Reserve [Line Items]          
Number of new approved restructuring projects | case   0      
Total Global Growth and Efficiency Program charges, pretax   $ (13) $ 57 $ 88  
Global Growth and Efficiency Program          
Restructuring Cost and Reserve [Line Items]          
Restructuring reduction $ 16        
Restructuring reduction after tax 13        
Payments for Restructuring   53 113 167  
Restructuring Reserve 31 31 100 202 $ 234
Pretax charges related to the Restructuring Program to date     1,854    
Restructuring and related cost incurred cost to date after tax     1,380    
Charges against assets     76 27  
Total Global Growth and Efficiency Program charges, pretax     132 161  
Global Growth and Efficiency Program | Employee-Related Costs          
Restructuring Cost and Reserve [Line Items]          
Payments for Restructuring     55 107  
Restructuring Reserve     26 60 $ 127
Pretax charges related to the Restructuring Program to date     706    
Charges against assets   $ 3 7 9  
Total Global Growth and Efficiency Program charges, pretax     25 53  
Global Growth and Efficiency Program | Third party Incremental Cost          
Restructuring Cost and Reserve [Line Items]          
Total Global Growth and Efficiency Program charges, pretax     32 42  
Global Growth and Efficiency Program | Contract Termination          
Restructuring Cost and Reserve [Line Items]          
Total Global Growth and Efficiency Program charges, pretax     5 48  
Global Growth and Efficiency Program | Land and Building          
Restructuring Cost and Reserve [Line Items]          
Total Global Growth and Efficiency Program charges, pretax     28    
Global Growth and Efficiency Program | Selling, general and administrative expenses          
Restructuring Cost and Reserve [Line Items]          
Restructuring reduction 3        
Total Global Growth and Efficiency Program charges, pretax     60 33  
Global Growth and Efficiency Program | Other (income) expense, net          
Restructuring Cost and Reserve [Line Items]          
Restructuring reduction $ 13        
Total Global Growth and Efficiency Program charges, pretax     $ 57 $ 88