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Consolidated net debt - Analysis of changes in consolidated net cash/(debt) (Detail)
$ in Millions
 6 Months Ended
Jun. 30, 2020
USD ($)
Disclosure of financial liabilities [Abstract]  
Net debt at beginning balance $ (3,651)
Foreign exchange adjustment 27
Cash movements excluding exchange movements, net debt (1,127)
Other non-cash movements (75)
Net debt at ending balance (4,826)
Borrowings Excluding Overdraft  
Disclosure of financial liabilities [Abstract]  
Financial liabilities, beginning balance (12,806)
Foreign exchange adjustment 76
Cash movements excluding exchange movements 464
Other non-cash movements (323)
Financial liabilities, ending balance (12,589)
Lease liabilities  
Disclosure of financial liabilities [Abstract]  
Financial liabilities, beginning balance (1,309)
Foreign exchange adjustment 33
Cash movements excluding exchange movements 154
Other non-cash movements (53)
Financial liabilities, ending balance (1,175)
Debt-related derivatives (included in other financial assets/liabilities  
Disclosure of financial liabilities [Abstract]  
Financial liabilities, beginning balance (147)
Foreign exchange adjustment (61)
Cash movements excluding exchange movements 91
Other non-cash movements 280
Financial liabilities, ending balance 163
Cash/overdrafts  
Disclosure of financial liabilities [Abstract]  
Cash and overdrafts, beginning balance 8,027
Foreign exchange adjustment (21)
Cash movements excluding exchange movements (1,752)
Other non-cash movements 0
Cash and overdrafts, ending balance 6,254
Other Investments  
Disclosure of financial liabilities [Abstract]  
Cash and overdrafts, beginning balance 2,584
Foreign exchange adjustment 0
Cash movements excluding exchange movements (84)
Other non-cash movements 21
Cash and overdrafts, ending balance $ 2,521