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Financial instruments and risk management - Summary of financial instruments carried at fair value (Detail) - USD ($) $ in Millions | Dec. 31, 2019 | Dec. 31, 2018
--- | --- | ---
Disclosure of detailed information about financial instruments [line items] |  |
Cash and cash equivalents | $ 8,027 | $ 10,773
Investments in equity shares and funds | 3,971 | 4,299
Equity shares and quoted funds | 61 | 130
Other investments, including loans | 2,839 | 2,782
Trade and other financial receivables | 2,938 | 3,007
Trade and other financial payables | (5,398) | (5,552)
Net assets | 45,242 | 49,823
Fair value |  |
Disclosure of detailed information about financial instruments [line items] |  |
Cash and cash equivalents | 8,027 | 10,773
Investments in equity shares and funds | 61 | 130
Other investments, including loans | 2,839 | 2,782
Trade and other financial receivables | 2,938 | 3,007
Financial assets (excluding derivative assets) |  | 16,692
Forward contracts and option contracts: designated as hedges(f) (Section B) | 42 | 8
Forward contracts and option contracts, not designated as hedges | 120 | 334
Derivatives related to net debt | (147) | (288)
Trade and other financial payables | (5,398) | (5,552)
Net assets | 8,482 | 11,194
Fair value | Level 1 [Member] |  |
Disclosure of detailed information about financial instruments [line items] |  |
Cash and cash equivalents | 5,320 | 7,994
Investments in equity shares and funds | 26 | 92
Other investments, including loans | 2,607 | 2,544
Trade and other financial receivables | 15 | 20
Financial assets (excluding derivative assets) |  | 10,650
Net assets | 7,968 | 10,650
Fair value | Level 2 |  |
Disclosure of detailed information about financial instruments [line items] |  |
Trade and other financial receivables | 1,122 | 972
Financial assets (excluding derivative assets) |  | 972
Forward contracts and option contracts, not designated as hedges | 25 | (25)
Derivatives related to net debt | (147) | (288)
Trade and other financial payables | (57) | (39)
Net assets | 943 | 620
Fair value | Level 3 [Member] |  |
Disclosure of detailed information about financial instruments [line items] |  |
Investments in equity shares and funds | 35 | 38
Other investments, including loans | 211 | 232
Financial assets (excluding derivative assets) |  | 270
Forward contracts and option contracts: designated as hedges(f) (Section B) | 42 | 8
Forward contracts and option contracts, not designated as hedges | 95 | 359
Net assets | 383 | 637
Not held at fair value |  |
Disclosure of detailed information about financial instruments [line items] |  |
Cash and cash equivalents | 2,707 | 2,779
Other investments, including loans | 21 | 6
Trade and other financial receivables | 1,801 | 2,015
Financial assets (excluding derivative assets) |  | 4,800
Trade and other financial payables | (5,341) | (5,513)
Net assets | $ (812) | $ (713)

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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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- Definition The amount of investments accounted for using the equity method. The equity method is a method of accounting whereby the investment is initially recognised at cost and adjusted thereafter for the post-acquisition change in the investor's share of net assets of the investee. The investor's profit or loss includes its share of the profit or loss of the investee. The investor's other comprehensive income includes its share of the other comprehensive income of the investee. [Refer: At cost [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 8 -IssueDate 2019-01-01 -Paragraph 24 -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=8&code=ifrs-tx-2019-en-r&anchor=para_24_a&doctype=Standard -URIDate 2019-03-27 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 12 -IssueDate 2019-01-01 -Paragraph B16 -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=12&code=ifrs-tx-2019-en-r&anchor=para_B16&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 e -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2019-en-r&anchor=para_54_e&doctype=Standard -URIDate 2019-03-27 + Details
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