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Financial instruments - Summary of fair value of financial instruments (Detail) - USD ($)
$ in Millions
Jun. 30, 2023
Dec. 31, 2022
Jun. 30, 2022
Disclosure of detailed information about financial instruments [line items]      
Cash and cash equivalents $ 9,179 $ 6,775 [1] $ 11,412
Investments in equity shares and funds 3,574 3,298 [1]  
Fair value      
Disclosure of detailed information about financial instruments [line items]      
Cash and cash equivalents 9,179 6,775  
Investments in equity shares and funds 167 222  
Other investments, including loans 1,474 2,275  
Trade and other financial receivables 2,908 2,765  
Derivatives related to net debt 0 2  
Trade and other financial payables (6,175) (6,485)  
Derivatives related to net debt (664) (692)  
Fair value | Not Designated As Hedging Instrument      
Disclosure of detailed information about financial instruments [line items]      
Forward, option and embedded derivatives contracts 90 67  
Forward, option and embedded derivatives contracts (27) (92)  
Fair value | Hedging instruments      
Disclosure of detailed information about financial instruments [line items]      
Forward, option and embedded derivatives contracts (104) (189)  
Not held at fair value      
Disclosure of detailed information about financial instruments [line items]      
Cash and cash equivalents 6,724 4,050  
Investments in equity shares and funds 0 0  
Other investments, including loans 42 28  
Trade and other financial receivables 1,653 1,441  
Derivatives related to net debt 0 0  
Trade and other financial payables (6,103) (6,455)  
Derivatives related to net debt 0 0  
Not held at fair value | Not Designated As Hedging Instrument      
Disclosure of detailed information about financial instruments [line items]      
Forward, option and embedded derivatives contracts 0 0  
Forward, option and embedded derivatives contracts 0 0  
Not held at fair value | Hedging instruments      
Disclosure of detailed information about financial instruments [line items]      
Forward, option and embedded derivatives contracts 0 0  
Level 1 | Fair value      
Disclosure of detailed information about financial instruments [line items]      
Cash and cash equivalents 2,455 2,725  
Investments in equity shares and funds 86 147  
Other investments, including loans 1,232 2,018  
Trade and other financial receivables 13 18  
Derivatives related to net debt 0 0  
Trade and other financial payables 0 0  
Derivatives related to net debt 0 0  
Level 1 | Fair value | Not Designated As Hedging Instrument      
Disclosure of detailed information about financial instruments [line items]      
Forward, option and embedded derivatives contracts 0 0  
Forward, option and embedded derivatives contracts 0 0  
Level 1 | Fair value | Hedging instruments      
Disclosure of detailed information about financial instruments [line items]      
Forward, option and embedded derivatives contracts 0 0  
Level 2 | Fair value      
Disclosure of detailed information about financial instruments [line items]      
Cash and cash equivalents 0 0  
Investments in equity shares and funds 0 0  
Other investments, including loans 0 0  
Trade and other financial receivables 1,242 1,306  
Derivatives related to net debt 0 2  
Trade and other financial payables (72) (30)  
Derivatives related to net debt (664) (692)  
Level 2 | Fair value | Not Designated As Hedging Instrument      
Disclosure of detailed information about financial instruments [line items]      
Forward, option and embedded derivatives contracts 18 16  
Forward, option and embedded derivatives contracts (12) (57)  
Level 2 | Fair value | Hedging instruments      
Disclosure of detailed information about financial instruments [line items]      
Forward, option and embedded derivatives contracts 0 0  
Level 3 | Fair value      
Disclosure of detailed information about financial instruments [line items]      
Cash and cash equivalents 0 0  
Investments in equity shares and funds 81 75  
Other investments, including loans 200 229  
Trade and other financial receivables 0 0  
Derivatives related to net debt 0 0  
Trade and other financial payables 0 0  
Derivatives related to net debt 0 0  
Level 3 | Fair value | Not Designated As Hedging Instrument      
Disclosure of detailed information about financial instruments [line items]      
Forward, option and embedded derivatives contracts 72 51  
Forward, option and embedded derivatives contracts (15) (35)  
Level 3 | Fair value | Hedging instruments      
Disclosure of detailed information about financial instruments [line items]      
Forward, option and embedded derivatives contracts $ (104) $ (189)  
[1] Comparative information has been restated to reflect the adoption of narrow scope amendments to IAS12 'Income Taxes', refer to note 2 for details.