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2018 Global Restructuring Program Narrative (Details) - 2018 Global Restructuring Program
$ in Millions
3 Months Ended 36 Months Ended
Mar. 31, 2018
USD ($)
Dec. 31, 2020
USD ($)
Employee
Dec. 31, 2018
USD ($)
Dec. 31, 2017
USD ($)
Restructuring Cost and Reserve        
Restructuring Reserve $ 407     $ 0
After Tax        
Restructuring Cost and Reserve        
Restructuring Charges 434      
Before Tax        
Restructuring Cost and Reserve        
Restructuring Charges 577      
Other Liabilities        
Restructuring Cost and Reserve        
Restructuring Reserve 101      
Accrued Expenses        
Restructuring Cost and Reserve        
Restructuring Reserve $ 306      
Minimum | Scenario, Forecast        
Restructuring Cost and Reserve        
Expected Number of Positions Eliminated | Employee   5,000    
Minimum | After Tax | Scenario, Forecast        
Restructuring Cost and Reserve        
Restructuring and Related Cost, Expected Cost   $ 1,350 $ 950  
Minimum | Before Tax | Scenario, Forecast        
Restructuring Cost and Reserve        
Restructuring and Related Cost, Expected Cost   1,700 1,200  
Minimum | Cash charges | Scenario, Forecast        
Restructuring Cost and Reserve        
Restructuring and Related Cost, Expected Cost   900    
Minimum | Non-cash charges | Before Tax | Scenario, Forecast        
Restructuring Cost and Reserve        
Restructuring and Related Cost, Expected Cost   $ 800    
Maximum | Scenario, Forecast        
Restructuring Cost and Reserve        
Expected Number of Positions Eliminated | Employee   5,500    
Maximum | After Tax | Scenario, Forecast        
Restructuring Cost and Reserve        
Restructuring and Related Cost, Expected Cost   $ 1,500 1,050  
Maximum | Before Tax | Scenario, Forecast        
Restructuring Cost and Reserve        
Restructuring and Related Cost, Expected Cost   1,900 $ 1,350  
Maximum | Cash charges | Scenario, Forecast        
Restructuring Cost and Reserve        
Restructuring and Related Cost, Expected Cost   1,000    
Maximum | Non-cash charges | Before Tax | Scenario, Forecast        
Restructuring Cost and Reserve        
Restructuring and Related Cost, Expected Cost   $ 900