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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, 2019
Dec. 31, 2018
Jan. 01, 2019
Disclosure of financial liabilities [Abstract]      
Net debt at beginning balance $ 255 $ (3,845)  
Net debt, Adjustment for transition to new accounting standards     $ (1,248)
Foreign exchange adjustment (65) 213  
Cash movements excluding exchange movements, net debt (2,342) 4,045  
Other non-cash movements (251) (158)  
Net debt at ending balance (3,651) 255  
Borrowings (including finance leases) Excluding Overdraft [member]      
Disclosure of financial liabilities [Abstract]      
Financial liabilities, beginning balance (12,707) (15,120)  
Financial liabilities, adjustment for transition to new accounting standards     0
Foreign exchange adjustment (5) 123  
Cash movements excluding exchange movements 123 2,240  
Other non-cash movements (217) 50  
Financial liabilities, ending balance (12,806) (12,707)  
Lease liabilities [member]      
Disclosure of financial liabilities [Abstract]      
Financial liabilities, beginning balance (44) (53)  
Lease liabilities     (1,248)
Foreign exchange adjustment (9) 3  
Cash movements excluding exchange movements 315 6  
Other non-cash movements (323) 0  
Financial liabilities, ending balance (1,309) (44)  
Debt-related derivatives (included ino other financial assets/liabilities [member]      
Disclosure of financial liabilities [Abstract]      
Financial liabilities, beginning balance (288) (177)  
Financial liabilities, adjustment for transition to new accounting standards     0
Foreign exchange adjustment 3 (64)  
Cash movements excluding exchange movements 0 51  
Other non-cash movements 138 (98)  
Financial liabilities, ending balance (147) (288)  
Overdraft or Cash [member]      
Disclosure of financial liabilities [Abstract]      
Cash and overdrafts, beginning balance 10,772 10,547  
Foreign exchange adjustment (54) 151  
Cash movements excluding exchange movements (2,808) 191  
Other non-cash movements 117 (117)  
Cash and overdrafts, ending balance 8,027 10,772  
Cash and Overdrafts, adjustment for transition to new accounting standards     0
Other Investments [member]      
Disclosure of financial liabilities [Abstract]      
Cash and overdrafts, beginning balance 2,522 958  
Foreign exchange adjustment 0 0  
Cash movements excluding exchange movements 28 1,557  
Other non-cash movements 34 7  
Cash and overdrafts, ending balance $ 2,584 $ 2,522  
Cash and Overdrafts, adjustment for transition to new accounting standards     $ 0