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Analysis of Net Debt - Schedule of Currency Profile of Net Debt and Net Worth Capital and Reserves Attributable to Company's Equity Holders (Detail) - USD ($)
$ in Millions
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Disclosure of Net Debt and Net Worth (Capital and Reserves Attributable to Company's Equity Holders) [line items]        
Cash and cash equivalents (note 23) $ 5,783 $ 7,721 $ 4,218 $ 2,686
Interest-bearing loans and borrowings (note 24) (10,487) (12,215)    
Lease liabilities (note 20) (1,671) (1,635) (1,697)  
Derivative financial instruments (net) (note 25) 122 188 $ 74  
Group net debt excluding net debt reclassified as held for sale (6,253) (5,941)    
Non-debt assets and liabilities (including cash and bank overdrafts reclassified as held for sale) analysed as follows:        
Non-controlling interests (681) (692)    
Capital and reserves attributable to the Company's equity holders 20,233 19,656    
Currency profile [member]        
Disclosure of Net Debt and Net Worth (Capital and Reserves Attributable to Company's Equity Holders) [line items]        
Cash and cash equivalents (note 23) 5,783 7,721    
Interest-bearing loans and borrowings (note 24) (10,487) (12,215)    
Lease liabilities (note 20) (1,671) (1,635)    
Derivative financial instruments (net) (note 25) 122 188    
Group net debt excluding net debt reclassified as held for sale (6,253) (5,941)    
Non-debt assets and liabilities (including cash and bank overdrafts reclassified as held for sale) analysed as follows:        
Non-current assets 30,529 29,783    
Current assets 8,222 7,239    
Non-current liabilities (4,863) (4,833)    
Current liabilities (6,721) (5,900)    
Non-controlling interests (681) (692)    
Capital and reserves attributable to the Company's equity holders 20,233 19,656    
US Dollar [member] | Currency profile [member]        
Disclosure of Net Debt and Net Worth (Capital and Reserves Attributable to Company's Equity Holders) [line items]        
Cash and cash equivalents (note 23) 2,266 1,886    
Interest-bearing loans and borrowings (note 24) (4,665) (5,134)    
Lease liabilities (note 20) (856) (797)    
Derivative financial instruments (net) (note 25) 189 937    
Group net debt excluding net debt reclassified as held for sale (3,066) (3,108)    
Non-debt assets and liabilities (including cash and bank overdrafts reclassified as held for sale) analysed as follows:        
Non-current assets 17,661 16,199    
Current assets 4,369 3,586    
Non-current liabilities (3,115) (3,094)    
Current liabilities (2,866) (2,160)    
Non-controlling interests (105) (103)    
Capital and reserves attributable to the Company's equity holders 12,878 11,320    
Euro [member] | Currency profile [member]        
Disclosure of Net Debt and Net Worth (Capital and Reserves Attributable to Company's Equity Holders) [line items]        
Cash and cash equivalents (note 23) 2,386 4,586    
Interest-bearing loans and borrowings (note 24) (4,479) (5,589)    
Lease liabilities (note 20) (250) (282)    
Derivative financial instruments (net) (note 25) 1,463 736    
Group net debt excluding net debt reclassified as held for sale (880) (549)    
Non-debt assets and liabilities (including cash and bank overdrafts reclassified as held for sale) analysed as follows:        
Non-current assets 4,204 4,614    
Current assets 1,498 1,465    
Non-current liabilities (714) (678)    
Current liabilities (1,593) (1,654)    
Non-controlling interests (45) (54)    
Capital and reserves attributable to the Company's equity holders 2,470 3,144    
Pound Sterling [member] | Currency profile [member]        
Disclosure of Net Debt and Net Worth (Capital and Reserves Attributable to Company's Equity Holders) [line items]        
Cash and cash equivalents (note 23) 365 319    
Interest-bearing loans and borrowings (note 24) (537) (543)    
Lease liabilities (note 20) (255) (247)    
Derivative financial instruments (net) (note 25) (339) (344)    
Group net debt excluding net debt reclassified as held for sale (766) (815)    
Non-debt assets and liabilities (including cash and bank overdrafts reclassified as held for sale) analysed as follows:        
Non-current assets 2,614 2,598    
Current assets 993 871    
Non-current liabilities (431) (391)    
Current liabilities (1,156) (980)    
Non-controlling interests 0      
Capital and reserves attributable to the Company's equity holders 1,254 1,283    
Canadian Dollar [member] | Currency profile [member]        
Disclosure of Net Debt and Net Worth (Capital and Reserves Attributable to Company's Equity Holders) [line items]        
Cash and cash equivalents (note 23) 274 319    
Interest-bearing loans and borrowings (note 24) (3) (6)    
Lease liabilities (note 20) (150) (156)    
Derivative financial instruments (net) (note 25) (606) (774)    
Group net debt excluding net debt reclassified as held for sale (485) (617)    
Non-debt assets and liabilities (including cash and bank overdrafts reclassified as held for sale) analysed as follows:        
Non-current assets 1,844 1,905    
Current assets 564 519    
Non-current liabilities (213) (229)    
Current liabilities (348) (338)    
Non-controlling interests 0      
Capital and reserves attributable to the Company's equity holders 1,362 1,240    
Philippine Peso [member] | Currency profile [member]        
Disclosure of Net Debt and Net Worth (Capital and Reserves Attributable to Company's Equity Holders) [line items]        
Cash and cash equivalents (note 23) 19 62    
Interest-bearing loans and borrowings (note 24) (431) (546)    
Lease liabilities (note 20) (8) (10)    
Derivative financial instruments (net) (note 25) (91) (25)    
Group net debt excluding net debt reclassified as held for sale (511) (519)    
Non-debt assets and liabilities (including cash and bank overdrafts reclassified as held for sale) analysed as follows:        
Non-current assets 1,621 1,759    
Current assets 176 171    
Non-current liabilities (132) (177)    
Current liabilities (153) (165)    
Non-controlling interests (498) (501)    
Capital and reserves attributable to the Company's equity holders 503 568    
Polish Zloty [member] | Currency profile [member]        
Disclosure of Net Debt and Net Worth (Capital and Reserves Attributable to Company's Equity Holders) [line items]        
Cash and cash equivalents (note 23) 166 149    
Interest-bearing loans and borrowings (note 24) 0      
Lease liabilities (note 20) (54) (31)    
Derivative financial instruments (net) (note 25) (184) (111)    
Group net debt excluding net debt reclassified as held for sale (72) 7    
Non-debt assets and liabilities (including cash and bank overdrafts reclassified as held for sale) analysed as follows:        
Non-current assets 371 368    
Current assets 161 155    
Non-current liabilities (19) (22)    
Current liabilities (178) (175)    
Non-controlling interests 0      
Capital and reserves attributable to the Company's equity holders 263 333    
Swiss Franc [Member] | Currency profile [member]        
Disclosure of Net Debt and Net Worth (Capital and Reserves Attributable to Company's Equity Holders) [line items]        
Cash and cash equivalents (note 23) 103 125    
Interest-bearing loans and borrowings (note 24) (361) (374)    
Lease liabilities (note 20) (47) (54)    
Derivative financial instruments (net) (note 25) 0      
Group net debt excluding net debt reclassified as held for sale (305) (303)    
Non-debt assets and liabilities (including cash and bank overdrafts reclassified as held for sale) analysed as follows:        
Non-current assets 608 553    
Current assets 84 85    
Non-current liabilities (168) (145)    
Current liabilities (83) (91)    
Non-controlling interests (8) (8)    
Capital and reserves attributable to the Company's equity holders 128 91    
Other currencies [Member] | Currency profile [member]        
Disclosure of Net Debt and Net Worth (Capital and Reserves Attributable to Company's Equity Holders) [line items]        
Cash and cash equivalents (note 23) 204 275    
Interest-bearing loans and borrowings (note 24) (11) (23)    
Lease liabilities (note 20) (51) (58)    
Derivative financial instruments (net) (note 25) (310) (231)    
Group net debt excluding net debt reclassified as held for sale (168) (37)    
Non-debt assets and liabilities (including cash and bank overdrafts reclassified as held for sale) analysed as follows:        
Non-current assets 1,606 1,787    
Current assets 377 387    
Non-current liabilities (71) (97)    
Current liabilities (344) (337)    
Non-controlling interests (25) (26)    
Capital and reserves attributable to the Company's equity holders $ 1,375 $ 1,677