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Investment in associates and joint ventures - Summary of Financial Information of Material Associate Investment (Detail) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Disclosure of associates [Line Items] |  |  |
Non-current assets | $ 2,336 | $ 2,149 |
Non-current liabilities | (2,722) | (2,552) |
Net assets | (851) | (759) |
Revenue | 1,784 | 1,715 | $ 1,803
Loss for the period | 593 | 417 | $ 1,224
Barclay associate [member] |  |  |
Disclosure of associates [Line Items] |  |  |
Non-current assets | 540 | 552 |
Non-current liabilities | (287) | (39) |
Net assets | 275 | 249 |
Revenue | 90 | 45 |
Loss for the period | (16) | (34) |
Group's share of loss for the period | (4) | (8) |
Barclay associate [member] | Group share of reported net assets at 19.9% [member] |  |  |
Disclosure of associates [Line Items] |  |  |
Net assets | 55 | 50 |
Adjustments to reflect capitalised costs, and additional rights and obligations under the shareholder agreement | 10 | (7) |
Carrying amount | $ 65 | $ 43 |

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