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Risks Arising From Financial Instruments - Disclosure of Financial Assets And Liabilities (Detail) - USD ($) $ in Millions | Dec. 31, 2021 | Dec. 31, 2020
--- | --- | ---
Disclosure of Financial assets and liabilities [line items] |  |
Financial assets at amortized cost | $ 4,629 | $ 4,515
Financial assets at fair value through profit or loss | 446 | 475
Financial assets at fair value through OCI | 736 | 1,001
Total | 5,811 | 5,991
Financial liabilities at amortized cost | 110,904 | 119,372
Financial liabilities at fair value through profit or loss | 5,610 | 6,120
Financial liabilities at fair value through OCI | 276 | 686
Total | 116,790 | 126,178
Equity swaps [member] |  |
Disclosure of Financial assets and liabilities [line items] |  |
Total | 5,412 | 5,353
Trades and other payables [member] |  |
Disclosure of Financial assets and liabilities [line items] |  |
Financial liabilities at amortized cost | 22,074 | 20,807
Total | 22,074 | 20,807
Secured bank loans [member] |  |
Disclosure of Financial assets and liabilities [line items] |  |
Financial liabilities at amortized cost | 628 | 702
Total | 628 | 702
Unsecured bank loans [member] |  |
Disclosure of Financial assets and liabilities [line items] |  |
Financial liabilities at amortized cost | 106 | 294
Total | 106 | 294
Unsecured other loans [member] |  |
Disclosure of Financial assets and liabilities [line items] |  |
Financial liabilities at amortized cost | 40 | 83
Total | 40 | 83
Lease liabilities [member] |  |
Disclosure of Financial assets and liabilities [line items] |  |
Financial liabilities at amortized cost | 2,277 | 2,234
Total | 2,277 | 2,234
Unsecured bond issues [member] |  |
Disclosure of Financial assets and liabilities [line items] |  |
Financial liabilities at amortized cost | 85,726 | 93,725
Total | 85,726 | 93,725
Commercial paper [Member] |  |
Disclosure of Financial assets and liabilities [line items] |  |
Financial liabilities at amortized cost | 0 | 1,522
Total | 0 | 1,522
Bank Overdrafts [Member] |  |
Disclosure of Financial assets and liabilities [line items] |  |
Financial liabilities at amortized cost | 53 | 5
Total | 53 | 5
Non-current financial liabilities [Member] |  |
Disclosure of Financial assets and liabilities [line items] |  |
Financial liabilities at amortized cost | 88,182 | 96,748
Financial liabilities at fair value through profit or loss | 100 | 1,758
Total | 88,282 | 98,506
Current financial liabilities [Member] |  |
Disclosure of Financial assets and liabilities [line items] |  |
Financial liabilities at amortized cost | 22,722 | 22,624
Financial liabilities at fair value through profit or loss | 5,510 | 4,362
Financial liabilities at fair value through OCI | 276 | 686
Total | 28,508 | 27,672
Derivatives not designated [member] | Equity swaps [member] |  |
Disclosure of Financial assets and liabilities [line items] |  |
Financial liabilities at fair value through profit or loss | 5,412 | 5,353
Total | 5,412 | 5,353
Derivatives not designated [member] | Cross currency interest rate swaps [Member] |  |
Disclosure of Financial assets and liabilities [line items] |  |
Financial liabilities at fair value through profit or loss | 172 | 446
Total | 172 | 446
Derivatives designated [member] | Equity swaps [member] |  |
Disclosure of Financial assets and liabilities [line items] |  |
Financial liabilities at fair value through OCI | 0 | 21
Total | 0 | 21
Derivatives designated [member] | Cross currency interest rate swaps [Member] |  |
Disclosure of Financial assets and liabilities [line items] |  |
Financial liabilities at fair value through OCI | 98 | 264
Total | 98 | 264
Derivatives designated [member] | Forward exchange contracts [member] |  |
Disclosure of Financial assets and liabilities [line items] |  |
Financial liabilities at fair value through OCI | 103 | 370
Total | 103 | 370
Derivatives designated [member] | Interest rate swap [member] |  |
Disclosure of Financial assets and liabilities [line items] |  |
Financial liabilities at fair value through OCI | 3 | 0
Total | 3 | 0
Derivatives designated [member] | Other commodity derivatives [Member] |  |
Disclosure of Financial assets and liabilities [line items] |  |
Financial liabilities at fair value through OCI | 35 | 26
Total | 35 | 26
Trade and other receivables [member] |  |
Disclosure of Financial assets and liabilities [line items] |  |
Financial assets at amortized cost | 4,607 | 4,493
Total | 4,607 | 4,493
Unquoted Debt [member] |  |
Disclosure of Financial assets and liabilities [line items] |  |
Financial assets at amortized cost | 22 | 22
Total | 22 | 22
Quoted Debt [member] |  |
Disclosure of Financial assets and liabilities [line items] |  |
Financial assets at fair value through profit or loss | 374 | 396
Total | 374 | 396
Equity instruments [member] |  |
Disclosure of Financial assets and liabilities [line items] |  |
Financial assets at fair value through OCI | 139 | 115
Total | 139 | 115
Foreign currency futures [member] | Derivatives designated [member] |  |
Disclosure of Financial assets and liabilities [line items] |  |
Financial liabilities at fair value through OCI | 37 | 5
Total | 37 | 5
Non-current financial assets [Member] |  |
Disclosure of Financial assets and liabilities [line items] |  |
Financial assets at amortized cost | 526 | 588
Financial assets at fair value through profit or loss | 73 | 79
Financial assets at fair value through OCI | 115 | 174
Total | 714 | 841
Current financial assets [Member] |  |
Disclosure of Financial assets and liabilities [line items] |  |
Financial assets at amortized cost | 4,103 | 3,927
Financial assets at fair value through profit or loss | 373 | 396
Financial assets at fair value through OCI | 621 | 827
Total | 5,097 | 5,150
Derivatives not designated [member] | Derivatives not designated [member] | Forward exchange contracts [member] |  |
Disclosure of Financial assets and liabilities [line items] |  |
Financial liabilities at fair value through profit or loss | 26 | 321
Total | 26 | 321
Derivatives not designated [member] | Equity swaps [member] |  |
Disclosure of Financial assets and liabilities [line items] |  |
Financial assets at fair value through profit or loss | 0 | 27
Total | 0 | 27
Derivatives not designated [member] | Interest rate swap [member] |  |
Disclosure of Financial assets and liabilities [line items] |  |
Financial assets at fair value through profit or loss | 20 | 45
Total | 20 | 45
Derivatives not designated [member] | Cross currency interest rate swap [member] |  |
Disclosure of Financial assets and liabilities [line items] |  |
Financial assets at fair value through profit or loss | 52 | 7
Total | 52 | 7
Derivatives designated [member] | Interest rate swap [member] |  |
Disclosure of Financial assets and liabilities [line items] |  |
Financial assets at fair value through OCI | 17 | 35
Total | 17 | 35
Derivatives designated [member] | Cross currency interest rate swap [member] |  |
Disclosure of Financial assets and liabilities [line items] |  |
Financial assets at fair value through OCI | 60 | 100
Total | 60 | 100
Derivatives designated [member] | Foreign Exchange Contracts [Member] |  |
Disclosure of Financial assets and liabilities [line items] |  |
Financial assets at fair value through OCI | 238 | 480
Total | 238 | 480
Derivatives designated [member] | Foreign currency futures [member] |  |
Disclosure of Financial assets and liabilities [line items] |  |
Financial assets at fair value through OCI | 0 | 36
Total | 0 | 36
Derivatives designated [member] | Commodity derivatives [member] |  |
Disclosure of Financial assets and liabilities [line items] |  |
Financial assets at fair value through OCI | 282 | 235
Total | $ 282 | $ 235

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- Definition The amount of financial assets that are measured at fair value and for which gains (losses) are recognised in profit or loss. A financial asset shall be measured at fair value through profit or loss unless it is measured at amortised cost or at fair value through other comprehensive income. A gain (loss) on a financial asset measured at fair value shall be recognised in profit or loss unless it is part of a hedging relationship, it is an investment in an equity instrument for which the entity has elected to present gains and losses in other comprehensive income or it is a financial asset measured at fair value through other comprehensive income. [Refer: At fair value [member]; Financial assets] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 7 -IssueDate 2021-01-01 -Paragraph 8 -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2021-en-r&anchor=para_8_a&doctype=Standard -URIDate 2021-03-24 + Details
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- Definition The amount of financial assets that are measured at fair value through other comprehensive income. A financial asset shall be measured at fair value through other comprehensive income if both of the following conditions are met: (a) the financial asset is held within a business model whose objective is achieved by both collecting contractual cash flows and selling financial assets and (b) the contractual terms of the financial asset give rise on specified dates to cash flows that are solely payments of principal and interest on the principal amount outstanding. [Refer: At fair value [member]; Financial assets] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 7 -IssueDate 2021-01-01 -Paragraph 8 -Subparagraph h -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2021-en-r&anchor=para_8_h&doctype=Standard -URIDate 2021-03-24 + Details
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- Definition The amount of liabilities that are: (a) a contractual obligation: (i) to deliver cash or another financial asset to another entity; or (ii) to exchange financial assets or financial liabilities with another entity under conditions that are potentially unfavourable to the entity; or (b) a contract that will, or may be, settled in the entity’s own equity instruments and is: (i) a non-derivative for which the entity is, or may be, obliged to deliver a variable number of the entity’s own equity instruments; or (ii) a derivative that will, or may be, settled other than by the exchange of a fixed amount of cash or another financial asset for a fixed number of the entity’s own equity instruments. For this purpose, rights, options or warrants to acquire a fixed number of the entity’s own equity instruments for a fixed amount of any currency are equity instruments if the entity offers the rights, options or warrants pro rata to all of its existing owners of the same class of its own non-derivative equity instruments. Also, for those purposes the entity’s own equity instruments do not include puttable financial instruments that are classified as equity instruments in accordance with paragraphs 16A-16B of IAS 32, instruments that impose on the entity an obligation to deliver to another party a pro rata share of the net assets of the entity only on liquidation and are classified as equity instruments in accordance with paragraphs 16C-16D of IAS 32, or instruments that are contracts for the future receipt or delivery of the entity’s own equity instruments. As an exception, an instrument that meets the definition of a financial liability is classified as an equity instrument if it has all the features and meets the conditions in paragraphs 16A-16B or paragraphs 16C-16D of IAS 32. [Refer: Financial instruments, class [member]; Financial assets; Derivatives [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 7 -IssueDate 2021-01-01 -Paragraph 25 -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2021-en-r&anchor=para_25&doctype=Standard -URIDate 2021-03-24 + Details
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