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Financial instruments and risk management - Summary of derivative financial instruments (Detail) - USD ($) $ in Millions | Dec. 31, 2019 | Dec. 31, 2018
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Disclosure of detailed information about financial instruments [line items] |  |
Derivative financial assets | $ 366 | $ 556
Derivative financial liabilities | (351) | (502)
Disclosure Of Information About Amounts Recognised In Balance Sheet [Abstract] |  |
Non-current assets | 308 | 468
Current assets | 58 | 88
Current liabilities | (103) | (95)
Non-current liabilities | (248) | (407)
Total net derivative instruments | 15 | 54
Within 1 year [member] |  |
Disclosure of detailed information about financial instruments [line items] |  |
Derivative financial assets | 58 | 88
Derivative financial liabilities | (103) | (95)
Between 1 and 5 years [member] |  |
Disclosure of detailed information about financial instruments [line items] |  |
Derivative financial assets | 96 | 153
Derivative financial liabilities | (86) | (205)
More than 5 years [member] |  |
Disclosure of detailed information about financial instruments [line items] |  |
Derivative financial assets | 212 | 315
Derivative financial liabilities | (162) | (202)
Other Financial Assets |  |
Disclosure of detailed information about financial instruments [line items] |  |
Total net derivative instruments | 15 | 54
Derivatives designated as hedges |  |
Disclosure of detailed information about financial instruments [line items] |  |
Derivative financial assets | 217 | 124
Derivative financial liabilities | (322) | (404)
Derivatives designated as hedges | Interest rate swaps [Member] |  |
Disclosure of detailed information about financial instruments [line items] |  |
Derivative financial assets | 151 | 70
Derivative financial liabilities | (38) | (137)
Derivatives designated as hedges | Cross currency interest rate swaps |  |
Disclosure of detailed information about financial instruments [line items] |  |
Derivative financial assets | 0 | 0
Derivative financial liabilities | (260) | (221)
Derivatives designated as hedges | Aluminium Embedded Derivatives |  |
Disclosure of detailed information about financial instruments [line items] |  |
Derivative financial assets | 66 | 54
Derivative financial liabilities | (24) | (46)
Derivatives not designated as hedges |  |
Disclosure of detailed information about financial instruments [line items] |  |
Derivative financial assets | 149 | 432
Derivative financial liabilities | (29) | (98)
Derivatives not designated as hedges | Aluminium Embedded Derivatives |  |
Disclosure of detailed information about financial instruments [line items] |  |
Derivative financial assets | 96 | 346
Derivative financial liabilities | 0 | 0
Derivatives not designated as hedges | Currency Forward Contracts Options And Swaps |  |
Disclosure of detailed information about financial instruments [line items] |  |
Derivative financial assets | 13 | 0
Derivative financial liabilities | (5) | (68)
Derivatives not designated as hedges | Other embedded derivatives |  |
Disclosure of detailed information about financial instruments [line items] |  |
Derivative financial assets | 14 | 6
Derivative financial liabilities | 0 | 0
Derivatives not designated as hedges | Other commodity contracts |  |
Disclosure of detailed information about financial instruments [line items] |  |
Derivative financial assets | 26 | 80
Derivative financial liabilities | $ (24) | $ (30)

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