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Financial instruments disclosures - Summary of changes in fair value of Level 3 financial assets and financial liabilities (Detail) - Level 3 [member] - USD ($) $ in Millions | 6 Months Ended | 12 Months Ended
--- | --- | ---
Jun. 30, 2018 | Dec. 31, 2017
Disclosure Of Financial Instruments [Line Items] |  |
Opening balance | $ (7) | $ 479
Adjustment from transition | 19 |
Currency translation adjustments | (9) | 8
– Consolidated sales revenue | 0 | 1
– Net operating costs | (1) | (5)
– Consolidated sales revenue | (6) | 17
– Net operating costs | 145 | (508)
Total unrealised gains transferred into other comprehensive income | 93 |
Disposals/maturity of financial instruments |  | (5)
Transfers | 22 | 6
Closing balance | 256 | (7)
Total gains/(losses) included in the income statement for assets and liabilities held at end of period | $ 138 | $ (491)

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