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Financial risk management objectives and policies - Liquidity risk (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Maturity analysis of financial liabilities        
Cash and cash equivalents $ 6,166 $ 6,329 $ 7,832  
Short-term fixed income investments 13      
Fixed deposits 64 53 42  
Overdrafts 183 291 286  
Committed bank facilities 4,875      
Undrawn committed bank facilities 4,900      
Total financial liabilities, undiscounted cash flows 64,071 66,119 52,254  
Derivative financial instruments 93 79 33  
Derivative financial instruments 87 83 142  
Effect of interest (8,019) (8,635) (8,000)  
Effect of discounting, fair values and issue costs (3,414) (2,893) (2,283)  
Financial instruments after effects of interest and discounting, fair values and issue costs 52,638 54,591 41,971  
Issue of Ordinary Shares 29 27,214 30  
Contingent consideration 2,222 2,865 3,323 $ 4,139
Borrowings 29,232 30,781 20,380  
Derivatives        
Maturity analysis of financial liabilities        
Total derivative financial instruments payable (receivable) 48 (6) (206)  
Effect of interest (22) (26) (26)  
Effect of discounting, fair values and issue costs 70 (29) (46)  
Financial instruments after effects of interest and discounting, fair values and issue costs 96 (61) (278)  
Derivative assets [Member]        
Maturity analysis of financial liabilities        
Derivative financial instruments receivable (15,062) (14,555) (12,732)  
Effect of interest 227 299 379  
Effect of discounting, fair values and issue costs 63 (36) (70)  
Financial instruments after effects of interest and discounting, fair values and issue costs (14,772) (14,292) (12,423)  
Derivative liabilities [Member]        
Maturity analysis of financial liabilities        
Derivative financial instruments payable 15,110 14,549 12,526  
Effect of interest (249) (325) (405)  
Effect of discounting, fair values and issue costs 7 7 24  
Financial instruments after effects of interest and discounting, fair values and issue costs 14,868 14,231 12,145  
Total non-derivative financial instruments        
Maturity analysis of financial liabilities        
Non-derivative financial instruments 64,023 66,125 52,460  
Effect of interest (7,997) (8,609) (7,974)  
Effect of discounting, fair values and issue costs (3,484) (2,864) (2,237)  
Financial instruments after effects of interest and discounting, fair values and issue costs 52,542 54,652 42,249  
Bank overdrafts and other loans        
Maturity analysis of financial liabilities        
Non-derivative financial instruments 365 387 667  
Effect of interest (15)      
Effect of discounting, fair values and issue costs     (1)  
Financial instruments after effects of interest and discounting, fair values and issue costs 350 387 666  
Bonds, non-derivative        
Maturity analysis of financial liabilities        
Non-derivative financial instruments 36,024 38,158 27,116  
Effect of interest (7,982) (8,609) (7,974)  
Effect of discounting, fair values and issue costs (113) (142) (109)  
Financial instruments after effects of interest and discounting, fair values and issue costs 27,929 29,407 19,033  
Lease liabilities        
Maturity analysis of financial liabilities        
Non-derivative financial instruments 1,025 1,076 738  
Effect of discounting, fair values and issue costs (72) (89) (57)  
Financial instruments after effects of interest and discounting, fair values and issue costs 953 987 681  
Trade and other payables        
Maturity analysis of financial liabilities        
Non-derivative financial instruments 26,609 26,504 23,939  
Effect of discounting, fair values and issue costs (3,299) (2,633) (2,070)  
Financial instruments after effects of interest and discounting, fair values and issue costs 23,310 23,871 21,869  
Due within one year        
Maturity analysis of financial liabilities        
Total financial liabilities, undiscounted cash flows 25,489 21,639 18,723  
Borrowings 5,500      
Due within one year | Derivatives        
Maturity analysis of financial liabilities        
Total derivative financial instruments payable (receivable) 33 8 (99)  
Due within one year | Derivative assets [Member]        
Maturity analysis of financial liabilities        
Derivative financial instruments receivable (12,445) (11,766) (9,719)  
Due within one year | Derivative liabilities [Member]        
Maturity analysis of financial liabilities        
Derivative financial instruments payable 12,478 11,774 (9,620)  
Due within one year | Total non-derivative financial instruments        
Maturity analysis of financial liabilities        
Non-derivative financial instruments 25,456 21,631 18,822  
Due within one year | Bank overdrafts and other loans        
Maturity analysis of financial liabilities        
Non-derivative financial instruments 365 387 667  
Due within one year | Bonds, non-derivative        
Maturity analysis of financial liabilities        
Non-derivative financial instruments 5,777 1,981 2,136  
Due within one year | Lease liabilities        
Maturity analysis of financial liabilities        
Non-derivative financial instruments 249 256 207  
Due within one year | Trade and other payables        
Maturity analysis of financial liabilities        
Non-derivative financial instruments 19,065 19,007 15,812  
Years 1 and 2        
Maturity analysis of financial liabilities        
Total financial liabilities, undiscounted cash flows 7,593 8,389 4,598  
Years 1 and 2 | Derivatives        
Maturity analysis of financial liabilities        
Total derivative financial instruments payable (receivable) 66 11 7  
Years 1 and 2 | Derivative assets [Member]        
Maturity analysis of financial liabilities        
Derivative financial instruments receivable (1,012) (55) (60)  
Years 1 and 2 | Derivative liabilities [Member]        
Maturity analysis of financial liabilities        
Derivative financial instruments payable 1,078 66 (67)  
Years 1 and 2 | Total non-derivative financial instruments        
Maturity analysis of financial liabilities        
Non-derivative financial instruments 7,527 8,378 4,591  
Years 1 and 2 | Bonds, non-derivative        
Maturity analysis of financial liabilities        
Non-derivative financial instruments 5,233 5,647 1,839  
Years 1 and 2 | Lease liabilities        
Maturity analysis of financial liabilities        
Non-derivative financial instruments 208 210 168  
Years 1 and 2 | Trade and other payables        
Maturity analysis of financial liabilities        
Non-derivative financial instruments 2,086 2,521 2,584  
Years 2 and 3        
Maturity analysis of financial liabilities        
Total financial liabilities, undiscounted cash flows 3,656 7,093 3,887  
Years 2 and 3 | Derivatives        
Maturity analysis of financial liabilities        
Total derivative financial instruments payable (receivable) 4 19 8  
Years 2 and 3 | Derivative assets [Member]        
Maturity analysis of financial liabilities        
Derivative financial instruments receivable (34) (1,060) (59)  
Years 2 and 3 | Derivative liabilities [Member]        
Maturity analysis of financial liabilities        
Derivative financial instruments payable 38 1,079 (67)  
Years 2 and 3 | Total non-derivative financial instruments        
Maturity analysis of financial liabilities        
Non-derivative financial instruments 3,652 7,074 3,879  
Years 2 and 3 | Bonds, non-derivative        
Maturity analysis of financial liabilities        
Non-derivative financial instruments 2,608 5,242 2,101  
Years 2 and 3 | Lease liabilities        
Maturity analysis of financial liabilities        
Non-derivative financial instruments 172 163 120  
Years 2 and 3 | Trade and other payables        
Maturity analysis of financial liabilities        
Non-derivative financial instruments 872 1,669 1,658  
Years 3 and 4        
Maturity analysis of financial liabilities        
Total financial liabilities, undiscounted cash flows 3,706 3,587 3,356  
Years 3 and 4 | Derivatives        
Maturity analysis of financial liabilities        
Total derivative financial instruments payable (receivable)   4 (71)  
Years 3 and 4 | Derivative assets [Member]        
Maturity analysis of financial liabilities        
Derivative financial instruments receivable (103) (35) (1,151)  
Years 3 and 4 | Derivative liabilities [Member]        
Maturity analysis of financial liabilities        
Derivative financial instruments payable 103 39 (1,080)  
Years 3 and 4 | Total non-derivative financial instruments        
Maturity analysis of financial liabilities        
Non-derivative financial instruments 3,706 3,583 3,427  
Years 3 and 4 | Bonds, non-derivative        
Maturity analysis of financial liabilities        
Non-derivative financial instruments 2,983 2,591 1,617  
Years 3 and 4 | Lease liabilities        
Maturity analysis of financial liabilities        
Non-derivative financial instruments 128 130 82  
Years 3 and 4 | Trade and other payables        
Maturity analysis of financial liabilities        
Non-derivative financial instruments 595 862 1,728  
Years 4 and 5        
Maturity analysis of financial liabilities        
Total financial liabilities, undiscounted cash flows 2,168 3,292 3,281  
Years 4 and 5 | Derivatives        
Maturity analysis of financial liabilities        
Total derivative financial instruments payable (receivable) 3 (7) 4  
Years 4 and 5 | Derivative assets [Member]        
Maturity analysis of financial liabilities        
Derivative financial instruments receivable (32) (118) (36)  
Years 4 and 5 | Derivative liabilities [Member]        
Maturity analysis of financial liabilities        
Derivative financial instruments payable 35 111 (40)  
Years 4 and 5 | Total non-derivative financial instruments        
Maturity analysis of financial liabilities        
Non-derivative financial instruments 2,165 3,299 3,277  
Years 4 and 5 | Bonds, non-derivative        
Maturity analysis of financial liabilities        
Non-derivative financial instruments 1,267 2,970 2,502  
Years 4 and 5 | Lease liabilities        
Maturity analysis of financial liabilities        
Non-derivative financial instruments 84 96 53  
Years 4 and 5 | Trade and other payables        
Maturity analysis of financial liabilities        
Non-derivative financial instruments 814 233 722  
Later than five years        
Maturity analysis of financial liabilities        
Total financial liabilities, undiscounted cash flows 21,459 22,119 18,409  
Later than five years | Derivatives        
Maturity analysis of financial liabilities        
Total derivative financial instruments payable (receivable) (58) (41) (55)  
Later than five years | Derivative assets [Member]        
Maturity analysis of financial liabilities        
Derivative financial instruments receivable (1,436) (1,521) (1,707)  
Later than five years | Derivative liabilities [Member]        
Maturity analysis of financial liabilities        
Derivative financial instruments payable 1,378 1,480 (1,652)  
Later than five years | Total non-derivative financial instruments        
Maturity analysis of financial liabilities        
Non-derivative financial instruments 21,517 22,160 18,464  
Later than five years | Bonds, non-derivative        
Maturity analysis of financial liabilities        
Non-derivative financial instruments 18,156 19,727 16,921  
Later than five years | Lease liabilities        
Maturity analysis of financial liabilities        
Non-derivative financial instruments 184 221 108  
Later than five years | Trade and other payables        
Maturity analysis of financial liabilities        
Non-derivative financial instruments 3,177 $ 2,212 $ 1,435  
Maturing July 2023 | Bank overdrafts and other loans        
Maturity analysis of financial liabilities        
Borrowings 2,000      
Maturing July 2024 | Bank overdrafts and other loans        
Maturity analysis of financial liabilities        
Borrowings 2,000      
Euro medium term note programme        
Maturity analysis of financial liabilities        
Debt instruments issued 3,068      
SEC registered programme        
Maturity analysis of financial liabilities        
Debt instruments issued $ 20,651