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Financial instruments and risk management - Summary of changes in fair value of Level 3 financial assets and financial liabilities (Detail) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2019 | Dec. 31, 2018
Disclosure of detailed information about financial instruments [line items] |  |
Currency translation adjustments | $ 65 | $ (898)
Level 3 [Member] |  |
Disclosure of detailed information about financial instruments [line items] |  |
Opening balance | 637 | (7)
Adjustment from transition to IFRS 9 | 0 | 19
Currency translation adjustments | (1) | (23)
– net operating costs | (7) | 9
– net operating costs | (254) | 375
Total unrealised gains transferred into other comprehensive income through cash flow hedges | 28 | 181
Additions | 1 | 67
Disposals/maturity of financial instruments | (21) | (6)
Transfers | 0 | 22
Closing balance | 383 | 637
Total gains/(losses) for the year included in the income statement for assets and liabilities held at year end | $ (263) | $ 346

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