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Financial instruments disclosures - Summary of fair value of financial instruments (Detail) - USD ($) $ in Millions | Jun. 30, 2020 | Dec. 31, 2019 | Jun. 30, 2019
--- | --- | --- | ---
Disclosure of detailed information about financial instruments [line items] |  |  |
Cash and cash equivalents | $ 6,269 | $ 8,027 | $ 6,861
Investments in equity shares and funds | 3,849 | 3,971 |
Net assets | 43,656 | 45,242 |
Provisionally priced receivables | 780 | 1,040 |
Fair value |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |
Cash and cash equivalents | 6,269 | 8,027 |
Investments in equity shares and funds | 51 | 61 |
Other investments, including loans | 2,819 | 2,839 |
Trade and other receivables | 2,314 | 2,938 |
Financial assets (excluding derivative assets) | 11,453 | 13,865 |
Forward contracts: designated as hedges | 207 | 42 |
Forward contracts and option contracts, not designated as hedges | 152 | 120 |
Derivatives related to net debt | 163 | (147) |
Trade and other financial payables | (5,019) | (5,398) |
Net assets | 6,956 | 8,482 |
Not held at fair value |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |
Cash and cash equivalents | 1,931 | 2,707 |
Investments in equity shares and funds | 0 | 0 |
Other investments, including loans | 77 | 21 |
Trade and other receivables | 1,415 | 1,801 |
Financial assets (excluding derivative assets) | 3,423 | 4,529 |
Forward contracts: designated as hedges | 0 | 0 |
Forward contracts and option contracts, not designated as hedges | 0 | 0 |
Derivatives related to net debt | 0 | 0 |
Trade and other financial payables | (4,990) | (5,341) |
Net assets | (1,567) | (812) |
Level 1 | Fair value |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |
Cash and cash equivalents | 4,338 | 5,320 |
Investments in equity shares and funds | 20 | 26 |
Other investments, including loans | 2,544 | 2,607 |
Trade and other receivables | 7 | 15 |
Financial assets (excluding derivative assets) | 6,909 | 7,968 |
Forward contracts: designated as hedges | 0 | 0 |
Forward contracts and option contracts, not designated as hedges | 3 | 0 |
Derivatives related to net debt | 0 | 0 |
Trade and other financial payables | 0 | 0 |
Net assets | 6,912 | 7,968 |
Level 2 | Fair value |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |
Cash and cash equivalents | 0 | 0 |
Investments in equity shares and funds | 0 | 0 |
Other investments, including loans | 0 | 0 |
Trade and other receivables | 892 | 1,122 |
Financial assets (excluding derivative assets) | 892 | 1,122 |
Forward contracts: designated as hedges | 4 | 0 |
Forward contracts and option contracts, not designated as hedges | 16 | 25 |
Derivatives related to net debt | 163 | (147) |
Trade and other financial payables | (29) | (57) |
Net assets | 1,046 | 943 |
Level 3 | Fair value |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |
Cash and cash equivalents | 0 | 0 |
Investments in equity shares and funds | 31 | 35 |
Other investments, including loans | 198 | 211 |
Trade and other receivables | 0 | 0 |
Financial assets (excluding derivative assets) | 229 | 246 |
Forward contracts: designated as hedges | 203 | 42 |
Forward contracts and option contracts, not designated as hedges | 133 | 95 |
Derivatives related to net debt | 0 | 0 |
Trade and other financial payables | 0 | 0 |
Net assets | $ 565 | $ 383 |

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- Definition The amount of cash on hand and demand deposits, along with short-term, highly liquid investments that are readily convertible to known amounts of cash and that are subject to an insignificant risk of changes in value. [Refer: Cash; Cash equivalents] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 7 -IssueDate 2019-01-01 -Paragraph 45 -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=7&code=ifrs-tx-2019-en-r&anchor=para_45&doctype=Standard -URIDate 2019-03-27 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 12 -IssueDate 2019-01-01 -Paragraph B13 -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=12&code=ifrs-tx-2019-en-r&anchor=para_B13_a&doctype=Appendix&subtype=B -URIDate 2019-03-27 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 1 -IssueDate 2019-01-01 -Paragraph 54 -Subparagraph i -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2019-en-r&anchor=para_54_i&doctype=Standard -URIDate 2019-03-27 + Details
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- Definition The fair value of financial instruments designated as hedging instruments. Hedging instruments are designated derivatives or (for a hedge of the risk of changes in foreign currency exchange rates only) designated non-derivative financial assets or non-derivative financial liabilities whose fair value or cash flows are expected to offset changes in the fair value or cash flows of a designated hedged item. [Refer: At fair value [member]; Derivatives [member]; Derivative financial assets; Derivative financial liabilities; Financial instruments, class [member]; Financial assets; Financial liabilities] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Note Expiry date 2021-01-01 -Name IFRS -Number 7 -IssueDate 2019-01-01 -Paragraph 22 -Subparagraph b -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2017-en-b&anchor=para_22_b&doctype=Standard&book=b -URIDate 2019-03-27 + Details
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