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Cash and cash equivalents (Tables)
 12 Months Ended
Dec. 31, 2017
Cash And Cash Equivalents [Abstract]  
Summary of cash and cash equivalents

 

 

 

 

 

 

2017

 

 

2016

 

 

Note

 

US$m

 

US$m

 

Cash at bank and in hand

 

 

 

 

1,035

 

 

956

 

Money market funds and other cash equivalents

 

 

 

 

9,515

 

 

7,245

 

Balance per Group balance sheet

 

 

 

 

10,550

 

 

8,201

 

Bank overdrafts repayable on demand (unsecured)

 

22

 

 

(3

)

 

(12

)

Balance per Group cash flow statement

 

 

 

 

10,547

 

 

8,189