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Impact of New Accounting Standards - Additional Information (Detail) - USD ($) $ in Millions |  | 6 Months Ended | 12 Months Ended
--- | --- | --- | ---
Jul. 01, 2019 | Dec. 31, 2019 | Dec. 31, 2018 | Jun. 30, 2019
Disclosure of initial application of standards or interpretations [line items] |  |  |  |  |
Increase in lease liabilities |  | $ 2,578 |  | $ 715 | [1]
Lease interest recorded in net finance costs |  | 48 | $ 23 | $ 47 |
Depreciation right of use assets |  | 357 |  |  |
Principal repayments on lease liabilities |  | 401 |  |  |
Interest repayments on lease liabilities |  | 48 |  |  |
Construction in progress [member] |  |  |  |  |
Disclosure of initial application of standards or interpretations [line items] |  |  |  |  |
Capitalised depreciation right of use assets |  | 19 |  |  |
Property, plant and equipment [member] |  |  |  |  |
Disclosure of initial application of standards or interpretations [line items] |  |  |  |  |
Right-of-use assets |  | 2,188 |  |  |
Property, plant and equipment [member] | Land and buildings [member] |  |  |  |  |
Disclosure of initial application of standards or interpretations [line items] |  |  |  |  |
Right-of-use assets |  | 735 |  |  |
Property, plant and equipment [member] | Property, plant and equipment [member] |  |  |  |  |
Disclosure of initial application of standards or interpretations [line items] |  |  |  |  |
Right-of-use assets |  | 1,453 |  |  |
Property, plant and equipment [member] | Freight Contracts [Member] |  |  |  |  |
Disclosure of initial application of standards or interpretations [line items] |  |  |  |  |
Right-of-use assets |  | $ 328 |  |  |
Increase (decrease) due to application of IFRS 16 [member] |  |  |  |  |
Disclosure of initial application of standards or interpretations [line items] |  |  |  |  |
Increase in lease liabilities | $ 2,300 |  |  |  |
Right-of-use assets | 2,200 |  |  |  |
Adjustments for net increase decrease in net asset. | $ 100 |  |  |  |
Weighted average incremental borrowing rate | 2.10% |  |  |  |
[1] | Relates to existing finance leases at 1 July 2019.

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- Definition The amount of depreciation of right-of-use assets. [Refer: Depreciation and amortisation expense; Right-of-use assets] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 16 -IssueDate 2019-01-01 -Paragraph 53 -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=16&code=ifrs-tx-2019-en-r&anchor=para_53_a&doctype=Standard -URIDate 2019-03-27 + Details
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