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Consolidated net (debt)/cash - Analysis of changes in consolidated net (debt)/cash footnotes (Detail) - USD ($) $ in Millions | Jun. 30, 2021 | Dec. 31, 2020 | Jun. 30, 2020
--- | --- | --- | ---
Disclosure of financial liabilities [Abstract] |  |  |
Borrowings | $ 12,405 | $ 12,653 |
Borrowings and other financial liabilities | 13,914 | 14,015 |
Bank overdrafts repayable on demand (unsecured) | (4) | 0 | $ (15)
Total other current financial liabilities | 704 | 607 |
Other non-current financial liabilities | 13,210 | 13,408 |
Reverse repurchase agreements | 1,800 | 1,200 |
Borrowings Excluding Overdrafts, Including Lease Liabilities |  |  |
Disclosure of financial liabilities [Abstract] |  |  |
Borrowings | 13,504 | 13,831 |
Net Other Financial Liabilities |  |  |
Disclosure of financial liabilities [Abstract] |  |  |
Total other current financial liabilities | 150 | 23 |
Other non-current financial liabilities | $ 256 | $ 161 |

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- Definition The amount of current financial liabilities that the entity does not separately disclose in the same statement or note. [Refer: Other financial liabilities; Current financial liabilities] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 12 -IssueDate 2020-01-01 -Paragraph B13 -Subparagraph b -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=12&code=ifrs-tx-2020-en-r&anchor=para_B13_b&doctype=Appendix&subtype=B -URIDate 2020-01-01 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 1 -IssueDate 2020-01-01 -Paragraph 54 -Subparagraph m -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2020-en-r&anchor=para_54_m&doctype=Standard -URIDate 2020-01-01 + Details
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