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Financial instruments and risk management - Summary of financial instruments carried at fair value (Detail) - USD ($)
$ in Millions
Dec. 31, 2024
Dec. 31, 2023
Disclosure of detailed information about financial instruments [line items]    
Cash and cash equivalents $ 8,495 $ 9,673
Loans related to equity accounted units 509 0
Held at fair value    
Disclosure of detailed information about financial instruments [line items]    
Cash and cash equivalents 8,495 9,673
Investments in equity shares and funds 279 181
Other investments, including loans 609 1,277
Trade and other financial receivables 3,342 3,243
Loans related to equity accounted units 509 0
Forward, option and embedded derivatives contracts 27 0
Derivatives related to net debt 24 87
Trade and other financial payables (6,536) (6,324)
Derivatives related to net debt (367) (516)
Held at fair value | Hedging instruments    
Disclosure of detailed information about financial instruments [line items]    
Forward, option and embedded derivatives contracts (180) (174)
Held at fair value | Not Designated As Hedging Instrument    
Disclosure of detailed information about financial instruments [line items]    
Forward, option and embedded derivatives contracts 61 54
Forward, option and embedded derivatives contracts (156) (92)
Held at fair value | Level 1    
Disclosure of detailed information about financial instruments [line items]    
Cash and cash equivalents 4,893 2,722
Investments in equity shares and funds 96 85
Other investments, including loans 230 896
Trade and other financial receivables 15 9
Loans related to equity accounted units 0 0
Forward, option and embedded derivatives contracts 0 0
Derivatives related to net debt 0 0
Trade and other financial payables 0 0
Derivatives related to net debt 0 0
Held at fair value | Level 1 | Hedging instruments    
Disclosure of detailed information about financial instruments [line items]    
Forward, option and embedded derivatives contracts 0 0
Held at fair value | Level 1 | 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
Held at fair value | Level 2    
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 1,379 1,383
Loans related to equity accounted units 0 0
Forward, option and embedded derivatives contracts 0 0
Derivatives related to net debt 24 87
Trade and other financial payables (144) (47)
Derivatives related to net debt (367) (516)
Held at fair value | Level 2 | Hedging instruments    
Disclosure of detailed information about financial instruments [line items]    
Forward, option and embedded derivatives contracts 0 0
Held at fair value | Level 2 | Not Designated As Hedging Instrument    
Disclosure of detailed information about financial instruments [line items]    
Forward, option and embedded derivatives contracts 42 28
Forward, option and embedded derivatives contracts (48) (63)
Held at fair value | Level 3    
Disclosure of detailed information about financial instruments [line items]    
Cash and cash equivalents 0 0
Investments in equity shares and funds 183 96
Other investments, including loans 275 228
Trade and other financial receivables 0 0
Loans related to equity accounted units 0 0
Forward, option and embedded derivatives contracts 27 0
Derivatives related to net debt 0 0
Trade and other financial payables 0 0
Derivatives related to net debt 0 0
Held at fair value | Level 3 | Hedging instruments    
Disclosure of detailed information about financial instruments [line items]    
Forward, option and embedded derivatives contracts (180) (174)
Held at fair value | Level 3 | Not Designated As Hedging Instrument    
Disclosure of detailed information about financial instruments [line items]    
Forward, option and embedded derivatives contracts 19 26
Forward, option and embedded derivatives contracts (108) (29)
Held at amortised cost    
Disclosure of detailed information about financial instruments [line items]    
Cash and cash equivalents 3,602 6,951
Investments in equity shares and funds 0 0
Other investments, including loans 104 153
Trade and other financial receivables 1,948 1,851
Loans related to equity accounted units 509 0
Forward, option and embedded derivatives contracts 0 0
Derivatives related to net debt 0 0
Trade and other financial payables (6,392) (6,277)
Derivatives related to net debt 0 0
Held at amortised cost | Hedging instruments    
Disclosure of detailed information about financial instruments [line items]    
Forward, option and embedded derivatives contracts 0 0
Held at amortised cost | 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