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2018 Global Restructuring Program Narrative (Details) - 2018 Global Restructuring Program
3 Months Ended 9 Months Ended 45 Months Ended 48 Months Ended
Sep. 30, 2021
USD ($)
Sep. 30, 2020
USD ($)
Sep. 30, 2021
USD ($)
Sep. 30, 2020
USD ($)
Sep. 30, 2021
USD ($)
Dec. 31, 2021
USD ($)
Employee
Dec. 31, 2020
USD ($)
Dec. 31, 2019
USD ($)
Restructuring Cost and Reserve                
Restructuring Reserve $ 65,000,000 $ 114,000,000 $ 65,000,000 $ 114,000,000 $ 65,000,000   $ 94,000,000 $ 132,000,000
Payments for Restructuring     (171,000,000) (177,000,000)        
Before Tax                
Restructuring Cost and Reserve                
Restructuring Charges 97,000,000 157,000,000 250,000,000 337,000,000 2,100,000,000      
After Tax                
Restructuring Cost and Reserve                
Restructuring Charges 81,000,000 107,000,000 202,000,000 254,000,000 1,600,000,000      
Accrued Expenses                
Restructuring Cost and Reserve                
Restructuring Reserve 48,000,000 80,000,000 48,000,000 80,000,000 48,000,000      
Other current liabilities                
Restructuring Cost and Reserve                
Restructuring Reserve $ 17,000,000 $ 34,000,000 $ 17,000,000 $ 34,000,000 $ 17,000,000      
Minimum | Scenario, Forecast                
Restructuring Cost and Reserve                
Expected Number of Positions Eliminated | Employee           6,300    
Minimum | Before Tax | Scenario, Forecast                
Restructuring Cost and Reserve                
Restructuring and Related Cost, Expected Cost           $ 2,100,000,000    
Restructuring and Related Cost, Expected Cost Remaining           280,000,000    
Minimum | After Tax | Scenario, Forecast                
Restructuring Cost and Reserve                
Restructuring and Related Cost, Expected Cost           1,600,000,000    
Restructuring and Related Cost, Expected Cost Remaining           225,000,000    
Minimum | Cash charges | Scenario, Forecast                
Restructuring Cost and Reserve                
Restructuring and Related Cost, Expected Cost           1,150,000,000    
Minimum | Non-cash charges | Before Tax | Scenario, Forecast                
Restructuring Cost and Reserve                
Restructuring and Related Cost, Expected Cost           $ 950,000,000    
Maximum | Scenario, Forecast                
Restructuring Cost and Reserve                
Expected Number of Positions Eliminated | Employee           6,400    
Maximum | Before Tax | Scenario, Forecast                
Restructuring Cost and Reserve                
Restructuring and Related Cost, Expected Cost           $ 2,200,000,000    
Restructuring and Related Cost, Expected Cost Remaining           380,000,000    
Maximum | After Tax | Scenario, Forecast                
Restructuring Cost and Reserve                
Restructuring and Related Cost, Expected Cost           1,700,000,000    
Restructuring and Related Cost, Expected Cost Remaining           300,000,000    
Maximum | Cash charges | Scenario, Forecast                
Restructuring Cost and Reserve                
Restructuring and Related Cost, Expected Cost           1,200,000,000    
Maximum | Non-cash charges | Before Tax | Scenario, Forecast                
Restructuring Cost and Reserve                
Restructuring and Related Cost, Expected Cost           $ 1,000,000,000.0