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Subsequent Events - Announcement of 2018 Global Restructuring Program Narrative (Details) - 2018 Global Restructuring Program - Scenario, Forecast
$ in Millions
36 Months Ended
Dec. 31, 2020
USD ($)
Employee
Dec. 31, 2018
USD ($)
Minimum    
Restructuring Cost and Reserve    
Restructuring and Related Cost, Expected Number of Positions Eliminated | Employee 5,000  
Minimum | Cash charges    
Restructuring Cost and Reserve    
Restructuring and Related Cost, Expected Cost $ 900  
Minimum | After Tax    
Restructuring Cost and Reserve    
Restructuring and Related Cost, Expected Cost 1,350 $ 950
Minimum | Before Tax    
Restructuring Cost and Reserve    
Restructuring and Related Cost, Expected Cost 1,700 1,200
Minimum | Before Tax | Non-cash charges    
Restructuring Cost and Reserve    
Restructuring and Related Cost, Expected Cost $ 800  
Maximum    
Restructuring Cost and Reserve    
Restructuring and Related Cost, Expected Number of Positions Eliminated | Employee 5,500  
Maximum | Cash charges    
Restructuring Cost and Reserve    
Restructuring and Related Cost, Expected Cost $ 1,000  
Maximum | After Tax    
Restructuring Cost and Reserve    
Restructuring and Related Cost, Expected Cost 1,500 1,050
Maximum | Before Tax    
Restructuring Cost and Reserve    
Restructuring and Related Cost, Expected Cost 1,900 $ 1,350
Maximum | Before Tax | Non-cash charges    
Restructuring Cost and Reserve    
Restructuring and Related Cost, Expected Cost $ 900