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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, 2020
Dec. 31, 2019
Jan. 01, 2019
Disclosure of financial liabilities [Abstract]      
Net debt at beginning balance $ (3,651) $ 255  
Net debt, Adjustment for transition to new accounting standards     $ (1,248)
Foreign exchange adjustment 74 (65)  
Cash movements excluding exchange movements, net debt 3,051 (2,342)  
Other non-cash movements (138) (251)  
Net debt at ending balance (664) (3,651)  
Borrowings excluding overdrafts      
Disclosure of financial liabilities [Abstract]      
Financial liabilities, beginning balance (12,806) (12,707)  
Financial liabilities, adjustment for transition to new accounting standards     0
Foreign exchange adjustment (83) (5)  
Cash movements excluding exchange movements 505 123  
Other non-cash movements (269) (217)  
Financial liabilities, ending balance (12,653) (12,806)  
Lease liabilities      
Disclosure of financial liabilities [Abstract]      
Financial liabilities, beginning balance (1,309) (44)  
Lease liabilities     (1,248)
Foreign exchange adjustment (47) (9)  
Cash movements excluding exchange movements 324 315  
Other non-cash movements (146) (323)  
Financial liabilities, ending balance (1,178) (1,309)  
Debt-related derivatives (included in other financial assets/liabilities      
Disclosure of financial liabilities [Abstract]      
Financial liabilities, beginning balance (147) (288)  
Financial liabilities, adjustment for transition to new accounting standards     0
Foreign exchange adjustment 39 3  
Cash movements excluding exchange movements 91 0  
Other non-cash movements 265 138  
Financial liabilities, ending balance 248 (147)  
Cash and cash equivalents      
Disclosure of financial liabilities [Abstract]      
Cash and cash equivalents and other investments, beginning balance 8,027 10,772  
Cash and cash equivalents and other investments, adjustment for transition to new accounting standards     0
Foreign exchange adjustment 165 (54)  
Cash movements excluding exchange movements 2,189 (2,808)  
Other non-cash movements 0 117  
Cash and cash equivalents and other investments, ending balance 10,381 8,027  
Other Investments      
Disclosure of financial liabilities [Abstract]      
Cash and cash equivalents and other investments, beginning balance 2,584 2,522  
Cash and cash equivalents and other investments, adjustment for transition to new accounting standards     $ 0
Foreign exchange adjustment 0 0  
Cash movements excluding exchange movements (58) 28  
Other non-cash movements 12 34  
Cash and cash equivalents and other investments, ending balance $ 2,538 $ 2,584