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Risks arising from Financial instruments - Schedule of Commodity Derivatives Outstanding (Detail) - Commodity price risk [member] - Commodity derivatives [member] - USD ($) $ in Millions | Jun. 30, 2020 | Dec. 31, 2019
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Disclosure of risk management strategy related to hedge accounting [line items] |  |
Commodity derivatives outstanding | $ 1,964 | $ 2,360
Aluminum swap [member] |  |
Disclosure of risk management strategy related to hedge accounting [line items] |  |
Commodity derivatives outstanding | 1,342 | 1,449
Exchange traded sugar futures [member] |  |
Disclosure of risk management strategy related to hedge accounting [line items] |  |
Commodity derivatives outstanding | 57 | 54
Natural gas and energy derivatives [member] |  |
Disclosure of risk management strategy related to hedge accounting [line items] |  |
Commodity derivatives outstanding | 150 | 256
Corn swaps [member] |  |
Disclosure of risk management strategy related to hedge accounting [line items] |  |
Commodity derivatives outstanding | 202 | 195
Exchange traded wheat futures [member] |  |
Disclosure of risk management strategy related to hedge accounting [line items] |  |
Commodity derivatives outstanding | 7 | 20
Rice swaps [member] |  |
Disclosure of risk management strategy related to hedge accounting [line items] |  |
Commodity derivatives outstanding | 168 | 328
Plastic derivatives [member] |  |
Disclosure of risk management strategy related to hedge accounting [line items] |  |
Commodity derivatives outstanding | $ 38 | $ 59

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- Definition Commodity derivatives outstanding. + References No definition available. + Details
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Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Line items represent concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes of the table. + References No definition available. + Details
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- Details
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Namespace Prefix: |
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- Details
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Namespace Prefix: |
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Balance Type: |
Period Type: |

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- Details
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Namespace Prefix: |
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Balance Type: |
Period Type: |

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- Details
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Namespace Prefix: |
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Balance Type: |
Period Type: |

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
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Namespace Prefix: |
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Balance Type: |
Period Type: |

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
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Namespace Prefix: |
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Balance Type: |
Period Type: |

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- Details
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Namespace Prefix: |
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Balance Type: |
Period Type: |