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2018 Global Restructuring Program Narrative (Details) - 2018 Global Restructuring Program
$ in Millions
3 Months Ended 15 Months Ended 36 Months Ended
Mar. 31, 2019
USD ($)
Mar. 31, 2018
USD ($)
Mar. 31, 2019
USD ($)
Dec. 31, 2020
USD ($)
Employee
Dec. 31, 2019
USD ($)
Dec. 31, 2018
USD ($)
Dec. 31, 2017
USD ($)
Restructuring Cost and Reserve              
Restructuring Reserve $ 219 $ 407 $ 219     $ 210 $ 0
Payments for Restructuring (71) (14)          
After Tax              
Restructuring Cost and Reserve              
Restructuring Charges 121 434 905        
Before Tax              
Restructuring Cost and Reserve              
Restructuring Charges 152 577 1,200        
Accrued Expenses              
Restructuring Cost and Reserve              
Restructuring Reserve 132 306 132        
Other current liabilities              
Restructuring Cost and Reserve              
Restructuring Reserve $ 87 $ 101 $ 87        
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 $ 470    
Minimum | Before Tax | Scenario, Forecast              
Restructuring Cost and Reserve              
Restructuring and Related Cost, Expected Cost       1,700 600    
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       $ 1,500 570    
Maximum | Before Tax | Scenario, Forecast              
Restructuring Cost and Reserve              
Restructuring and Related Cost, Expected Cost       1,900 $ 750    
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