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Consolidated net (debt)/cash - Analysis of changes in consolidated net (debt)/cash (Detail)
$ in Millions
 6 Months Ended
Jun. 30, 2021
USD ($)
Disclosure of financial liabilities [Abstract]  
Net debt at beginning balance $ (664)
Foreign exchange adjustment (18)
Cash movements excluding exchange movements, net debt 3,937
Other non-cash movements (115)
Net debt at ending balance 3,140
Borrowings Excluding Overdraft  
Disclosure of financial liabilities [Abstract]  
Financial liabilities, beginning balance (12,653)
Foreign exchange adjustment 5
Cash movements excluding exchange movements 120
Other non-cash movements 125
Financial liabilities, ending balance (12,403)
Lease liabilities  
Disclosure of financial liabilities [Abstract]  
Financial liabilities, beginning balance (1,178)
Foreign exchange adjustment 1
Cash movements excluding exchange movements 170
Other non-cash movements (94)
Financial liabilities, ending balance (1,101)
Debt-related derivatives (included in other financial liabilities/assets  
Disclosure of financial liabilities [Abstract]  
Financial liabilities, beginning balance 248
Foreign exchange adjustment (3)
Cash movements excluding exchange movements (1)
Other non-cash movements (133)
Financial liabilities, ending balance 111
Cash and cash equivalents  
Disclosure of financial liabilities [Abstract]  
Cash and cash equivalents and other investments, beginning balance 10,381
Foreign exchange adjustment (21)
Cash movements excluding exchange movements 3,663
Other non-cash movements 0
Cash and cash equivalents and other investments, ending balance 14,023
Other Investments  
Disclosure of financial liabilities [Abstract]  
Cash and cash equivalents and other investments, beginning balance 2,538
Foreign exchange adjustment 0
Cash movements excluding exchange movements (15)
Other non-cash movements (13)
Cash and cash equivalents and other investments, ending balance $ 2,510