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Consolidated net cash/(debt) - Analysis of changes in consolidated net cash/(debt) (Detail) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Disclosure of financial liabilities [Line Items]      
Net debt, beginning balance $ (664) $ (3,651)  
Net debt, foreign exchange adjustment 152 74  
Net debt, cash movements excluding exchange movements 2,794 3,051  
Net debt, other non-cash movements (706) (138)  
Net debt, ending balance 1,576 (664) $ (3,651)
Borrowings 13,531 13,831  
Borrowings and other financial liabilities 14,169 14,015  
Other current financial liabilities 1,381 607  
Other non-current financial liabilities 12,788 13,408  
Bank overdrafts repayable on demand (unsecured) (2) 0  
Highly liquid financial assets held in managed investment funds classified as held for trading 2,401 2,538  
Total other financial liabilities      
Disclosure of financial liabilities [Line Items]      
Other current financial liabilities 245 23  
Other non-current financial liabilities 393 161  
Borrowings excluding overdrafts      
Disclosure of financial liabilities [Line Items]      
Financial liabilities, beginning balance (12,653) (12,806)  
Financial liabilities, foreign exchange adjustment 67 (83)  
Financial liabilities,, cash movements excluding exchange movements 270 505  
Financial liabilities,, other non-cash movements 150 (269)  
Financial liabilities, ending balance (12,166) (12,653) (12,806)
Borrowings 12,168 12,653  
Lease liabilities      
Disclosure of financial liabilities [Line Items]      
Financial liabilities, beginning balance (1,178) (1,309)  
Financial liabilities, foreign exchange adjustment 30 (47)  
Financial liabilities,, cash movements excluding exchange movements 358 324  
Financial liabilities,, other non-cash movements (573) (146)  
Financial liabilities, ending balance (1,363) (1,178) (1,309)
Net-debt related derivatives (included in other financial assets/liabilities)      
Disclosure of financial liabilities [Line Items]      
Financial liabilities, beginning balance 248 (147)  
Financial liabilities, foreign exchange adjustment (45) 39  
Financial liabilities,, cash movements excluding exchange movements (51) 91  
Financial liabilities,, other non-cash movements (253) 265  
Financial liabilities, ending balance (101) 248 (147)
Cash and cash equivalents including overdrafts      
Disclosure of financial liabilities [Line Items]      
Cash and cash equivalents and other investments, beginning balance 10,381 8,027  
Cash and cash equivalents and other investments, foreign exchange adjustment 100 165  
Cash and cash equivalents and other investments, cash movements excluding exchange movements 2,324 2,189  
Cash and cash equivalents and other investments, other non-cash movements 0 0  
Cash and cash equivalents and other investments, ending balance 12,805 10,381 8,027
Other investments      
Disclosure of financial liabilities [Line Items]      
Cash and cash equivalents and other investments, beginning balance 2,538 2,584  
Cash and cash equivalents and other investments, foreign exchange adjustment 0 0  
Cash and cash equivalents and other investments, cash movements excluding exchange movements (107) (58)  
Cash and cash equivalents and other investments, other non-cash movements (30) 12  
Cash and cash equivalents and other investments, ending balance 2,401 $ 2,538 2,584
Borrowings excluding overdrafts, including lease liabilities      
Disclosure of financial liabilities [Line Items]      
Borrowings $ 13,529   $ 13,831