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Risks Arising From Financial Instruments - Disclosure of Financial Liabilities (Detail) - USD ($)
$ in Millions
Jun. 30, 2020
Dec. 31, 2019
Disclosure of financial liabilities [line items]    
Non-current $ 109,995 $ 99,684
Current 26,625 28,696
Trades and other payables [member]    
Disclosure of financial liabilities [line items]    
Trade and other payables 17,085 21,189
Secured bank loans [member]    
Disclosure of financial liabilities [line items]    
Non-current interest-bearing loans and borrowings 48 71
Current interest-bearing loans and borrowings 995 790
Unsecured bank loans [member]    
Disclosure of financial liabilities [line items]    
Non-current interest-bearing loans and borrowings 55 50
Current interest-bearing loans and borrowings 133 135
Secured other loans [member]    
Disclosure of financial liabilities [line items]    
Non-current interest-bearing loans and borrowings 104,162 95,674
Current interest-bearing loans and borrowings 1,916 2,532
Unsecured other loans [member]    
Disclosure of financial liabilities [line items]    
Non-current interest-bearing loans and borrowings 81 77
Current interest-bearing loans and borrowings 16 20
Lease liabilities [member]    
Disclosure of financial liabilities [line items]    
Non-current interest-bearing loans and borrowings 1,688 1,692
Current interest-bearing loans and borrowings 352 333
Commercial paper [Member]    
Disclosure of financial liabilities [line items]    
Current interest-bearing loans and borrowings 3,072 1,599
Cash and bank overdrafts [Member]    
Disclosure of financial liabilities [line items]    
Current interest-bearing loans and borrowings 153 68
Derivatives not designated [member] | Equity swaps [member]    
Disclosure of financial liabilities [line items]    
Financial liabilities at fair value through profit or loss 6,350 3,146
Derivatives not designated [member] | Cross currency interest rate swaps [Member]    
Disclosure of financial liabilities [line items]    
Financial liabilities at fair value through profit or loss 47 140
Derivatives not designated [member] | Other interest rate derivatives [member]    
Disclosure of financial liabilities [line items]    
Financial liabilities at fair value through profit or loss 9 156
Derivatives designated [member]    
Disclosure of financial liabilities [line items]    
Total 136,620 128,381
Derivatives designated [member] | Equity swaps [member]    
Disclosure of financial liabilities [line items]    
Financial liabilities at fair value through profit or loss 54 31
Derivatives designated [member] | Cross currency interest rate swaps [Member]    
Disclosure of financial liabilities [line items]    
Financial liabilities at fair value through profit or loss 69 35
Derivatives designated [member] | Other interest rate derivatives [member]    
Disclosure of financial liabilities [line items]    
Financial liabilities at fair value through profit or loss 2 107
Derivatives designated [member] | Forward exchange contracts [member]    
Disclosure of financial liabilities [line items]    
Financial liabilities at fair value through profit or loss 84 435
Derivatives designated [member] | Interest rate swap [member]    
Disclosure of financial liabilities [line items]    
Financial liabilities at fair value through profit or loss 0 4
Derivatives designated [member] | Other commodity derivatives [Member]    
Disclosure of financial liabilities [line items]    
Financial liabilities at fair value through profit or loss $ 250 $ 97