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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