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Cash and cash equivalents (Tables) | 12 Months Ended
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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 |

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- Definition The disclosure of detailed information about cash and cash equivalents. + References No definition available. + Details
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