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Financial instruments - Summary of fair value of financial instruments (Detail) - USD ($)
$ in Millions
Jun. 30, 2025
Dec. 31, 2024
Jun. 30, 2024
Assets      
Cash and cash equivalents $ 9,015 $ 8,495 $ 9,256
Investments in equity shares and funds 354 279  
Other investments, including loans 540 609  
Trade and other financial receivables 3,635 3,342  
Loans to equity accounted units 682 509  
Forward, option and embedded derivatives contracts 11 27  
Derivatives related to net debt 169 24  
Liabilities      
Trade and other financial payables (7,672) (6,536)  
Forward, option and embedded derivatives contracts (222) (180)  
Derivatives related to net debt (238) (367)  
Not Designated As Hedging Instrument      
Assets      
Forward, option and embedded derivatives contracts 187 61  
Liabilities      
Forward, option and embedded derivatives contracts (163) (156)  
Held at amortised cost      
Assets      
Cash and cash equivalents 5,982 3,602  
Investments in equity shares and funds 0 0  
Other investments, including loans 135 104  
Trade and other financial receivables 2,548 1,948  
Loans to equity accounted units 682 509  
Forward, option and embedded derivatives contracts 0 0  
Derivatives related to net debt 0 0  
Liabilities      
Trade and other financial payables (7,627) (6,392)  
Forward, option and embedded derivatives contracts 0 0  
Derivatives related to net debt 0 0  
Held at amortised cost | Not Designated As Hedging Instrument      
Assets      
Forward, option and embedded derivatives contracts 0 0  
Liabilities      
Forward, option and embedded derivatives contracts 0 0  
Level 1 | Fair value      
Assets      
Cash and cash equivalents 3,033 4,893  
Investments in equity shares and funds 119 96  
Other investments, including loans 115 230  
Trade and other financial receivables 10 15  
Loans to equity accounted units 0 0  
Forward, option and embedded derivatives contracts 0 0  
Derivatives related to net debt 0 0  
Liabilities      
Trade and other financial payables 0 0  
Forward, option and embedded derivatives contracts 0 0  
Derivatives related to net debt 0 0  
Level 1 | Fair value | Not Designated As Hedging Instrument      
Assets      
Forward, option and embedded derivatives contracts 0 0  
Liabilities      
Forward, option and embedded derivatives contracts 0 0  
Level 2 | Fair value      
Assets      
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 1,077 1,379  
Loans to equity accounted units 0 0  
Forward, option and embedded derivatives contracts 0 0  
Derivatives related to net debt 169 24  
Liabilities      
Trade and other financial payables (45) (144)  
Forward, option and embedded derivatives contracts 0 0  
Derivatives related to net debt (238) (367)  
Level 2 | Fair value | Not Designated As Hedging Instrument      
Assets      
Forward, option and embedded derivatives contracts 17 42  
Liabilities      
Forward, option and embedded derivatives contracts (47) (48)  
Level 3 | Fair value      
Assets      
Cash and cash equivalents 0 0  
Investments in equity shares and funds 235 183  
Other investments, including loans 290 275  
Trade and other financial receivables 0 0  
Loans to equity accounted units 0 0  
Forward, option and embedded derivatives contracts 11 27  
Derivatives related to net debt 0 0  
Liabilities      
Trade and other financial payables 0 0  
Forward, option and embedded derivatives contracts (222) (180)  
Derivatives related to net debt 0 0  
Level 3 | Fair value | Not Designated As Hedging Instrument      
Assets      
Forward, option and embedded derivatives contracts 170 19  
Liabilities      
Forward, option and embedded derivatives contracts $ (116) $ (108)