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Contingencies and commitments - Summary of capital commitments (Detail) - USD ($) $ in Millions | Dec. 31, 2017 | Dec. 31, 2016
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Capital Commitments |  |
Capital Commitments | $ 2,641 | $ 2,230
Due within 1 year [member] |  |
Capital Commitments |  |
Capital Commitments | 2,052 | 1,588
Between 1 and 3 years [member] |  |
Capital Commitments |  |
Capital Commitments | 531 | 433
Between 3 and 5 years [member] |  |
Capital Commitments |  |
Capital Commitments | 58 | 194
More than 5 years [member] |  |
Capital Commitments |  |
Capital Commitments |  | 15
Joint ventures [Member] |  |
Capital Commitments |  |
Capital Commitments | 29 | 113
Joint ventures [Member] | Due within 1 year [member] |  |
Capital Commitments |  |
Capital Commitments | $ 29 | $ 113

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