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Cash and cash equivalents - Summary of cash and cash equivalents (Detail) - USD ($)
$ in Millions
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Cash and cash equivalents [abstract]        
Cash at bank and in hand $ 978 $ 740    
Money market funds and other cash equivalents 7,049 10,033    
Balance per Group balance sheet 8,027 10,773    
Bank overdrafts repayable on demand (unsecured) 0 (1)    
Cash and cash equivalents included in Assets held for sale 0 117    
Balance per Group cash flow statement $ 8,027 $ 10,889 $ 10,547 $ 8,189