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Business Restructuring (Additional Information) (Detail) - USD ($)
$ in Millions
1 Months Ended 12 Months Ended
Jun. 30, 2020
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Restructuring Reserve [Roll Forward]        
Beginning balance   $ 224 $ 110  
Business restructuring   174 176 $ 66
Payments for restructuring   126 58 66
Restructuring reserve, foreign currency translation gain (loss)   21 4  
Ending balance   293 224 $ 110
Pension Plan        
Restructuring Cost and Reserve [Line Items]        
Pension curtailment charge   (6) (4)  
United States | Pension Plan        
Restructuring Cost and Reserve [Line Items]        
Pension curtailment charge   13 0  
2019 Restructuring Program        
Restructuring Reserve [Roll Forward]        
Business restructuring $ 176 27    
Restructuring Charges        
Restructuring Reserve [Roll Forward]        
Business restructuring   203 194  
Restructuring reserve, release of previously approved programs   $ (29) $ (18)