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Financial instruments and risk management - Summary of changes in fair value of Level 3 financial assets and financial liabilities (Detail) - Level 3 [member] - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017
Disclosure Of Financial Instruments [Line Items] |  |
Opening balance | $ (7) | $ 479
Adjustment from transition to IFRS 9 | 19 |
Currency translation adjustments | (23) | 8
– consolidated sales revenue |  | 1
– net operating costs | 9 | (5)
- consolidated sales revenue |  | 17
– net operating costs | 375 | (508)
Total unrealised gains transferred into other comprehensive income through cash flow hedges | 181 |
Additions | 67 |
Disposals/maturity of financial instruments | (6) | (5)
Transfers | 22 | 6
Closing balance | 637 | (7)
Total gains/(losses) for the year included in the income statement for assets and liabilities held at year end | $ 346 | $ (491)

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