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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
--- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Disclosure Of Financial Instruments [Line Items] |  |  |
– Consolidated sales revenue | $ (40,030) | $ (33,781) | $ (34,829)
– Net operating costs | 26,983 | 26,799 | 27,919
Level 3 [member] |  |  |
Disclosure Of Financial Instruments [Line Items] |  |  |
Financial assets and liabilities at beginning balance | 479 | 456 |
Currency translation adjustments | 8 | (2) |
– Consolidated sales revenue | 1 | 1 |
– Net operating costs | (5) | (28) |
- Consolidated sales revenue | 17 |  |
– Net operating costs | (508) | 11 |
Additions |  | 43 |
Impairment |  | (2) |
Disposals/maturity of financial instruments | (5) |  |
Transfers | 6 |  |
Financial assets and liabilities at ending balance | (7) | 479 | $ 456
Total (losses)/gains for the year included in the income statement for assets and liabilities held at year end | $ (491) | $ 11 |

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