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2018 Global Restructuring Program Narrative (Details) - 2018 Global Restructuring Program
$ in Millions
3 Months Ended 9 Months Ended 36 Months Ended
Sep. 30, 2018
USD ($)
Sep. 30, 2018
USD ($)
Dec. 31, 2020
USD ($)
Employee
Dec. 31, 2018
USD ($)
Dec. 31, 2017
USD ($)
Restructuring Cost and Reserve          
Restructuring Reserve $ 263 $ 263     $ 0
After Tax          
Restructuring Cost and Reserve          
Restructuring Charges 119 659      
Before Tax          
Restructuring Cost and Reserve          
Restructuring Charges 149 856      
Accrued Expenses          
Restructuring Cost and Reserve          
Restructuring Reserve 138 138      
Other Liabilities          
Restructuring Cost and Reserve          
Restructuring Reserve $ 125 $ 125      
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