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Net Debt - Summary of Movement in Net Debt (Detail) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Movement in net debt      
Net increase/(decrease) in cash and cash equivalents, net of overdrafts $ 1,430 $ (500) $ 563
Add back financing cash flows in respect of other components of net debt:      
Principal element of lease payments 65 59 35
Issue of long-term bonds, including effect of currency swaps (1,093)   (554)
Issue of commercial paper (738)    
Repayment of long-term bonds 290    
Decrease/(increase) in other borrowings 125 (127) 268
Decrease/(increase) in net debt arising from cash flows 79 (568)  
Other movements:      
Lease liabilities 144 (43)  
Increase in accrued interest (5) (7)  
Acquisitions and disposals 19 (25)  
Exchange and other adjustments (101) (57)  
Decrease/(increase) in net debt 136 (700)  
Net debt at beginning of the year (2,665) (1,965)  
Net debt at end of the year $ (2,529) $ (2,665) $ (1,965)