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Financial instruments (Tables)
 6 Months Ended
Jun. 30, 2025
Financial Instruments [Abstract]  
Disclosure of fair value measurement of assets
The below table summarizes financial assets and liabilities measured at fair value on a recurring basis as of June 30, 2025 and December 31, 2024.
June 30, 2025
December 31, 2024
($ millions)Level 1Level 2Level 3TotalLevel 1Level 2Level 3Total
Non-current financial assets
Long-term financial investments measured at FVOCI(1)
188 — 171 359 81 — 201 282 
Long-term financial investments measured at FVPL— — 1 1 — — 1 1 
Deferred compensation assets(2)
188 — — 188 180 — — 180 
Non-current financial assets at fair value376 — 172 548 261 — 202 463 
Current financial assets
Money market funds690 — — 690 432 — — 432 
Current portion of long-term financial investments measured at FVPL(3)
— — 2 2 — — 1 1 
Derivative financial instruments(3)
— 7 — 7 — 12 — 12 
Current financial assets at fair value690 7 2 699 432 12 1 445 
Financial assets at fair value1,066 7 174 1,247 693 12 203 908 
Financial liabilities
Contingent consideration liabilities— — (110)(110)— — (96)(96)
Derivative financial instruments
— (10)— (10)— (4)— (4)
Financial liabilities at fair value— (10)(110)(120)— (4)(96)(100)
(1)    As of December 31, 2024, included $11 million of Long-term convertible notes due from associated companies.
(2)    Recorded in Other non-current assets.
(3)    Recorded in Other current assets.
Financial assets
Long-term financial investments measured
at FVOCI		Financial investments
measured at FVPL
($ millions)2025202420252024
Balance as of January 1201 147 2 8 
Additions15 90 2 — 
Net (losses)/gains recognized in Consolidated Statement of Comprehensive Income(34)6 — — 
Net gains recognized in Consolidated Income Statement— — — 2 
Amortization— — (1)(2)
Settlements(11)— — (5)
Balance as of June 30171 243 3 3 
Disclosure of fair value measurement of liabilities
The below table summarizes financial assets and liabilities measured at fair value on a recurring basis as of June 30, 2025 and December 31, 2024.
June 30, 2025
December 31, 2024
($ millions)Level 1Level 2Level 3TotalLevel 1Level 2Level 3Total
Non-current financial assets
Long-term financial investments measured at FVOCI(1)
188 — 171 359 81 — 201 282 
Long-term financial investments measured at FVPL— — 1 1 — — 1 1 
Deferred compensation assets(2)
188 — — 188 180 — — 180 
Non-current financial assets at fair value376 — 172 548 261 — 202 463 
Current financial assets
Money market funds690 — — 690 432 — — 432 
Current portion of long-term financial investments measured at FVPL(3)
— — 2 2 — — 1 1 
Derivative financial instruments(3)
— 7 — 7 — 12 — 12 
Current financial assets at fair value690 7 2 699 432 12 1 445 
Financial assets at fair value1,066 7 174 1,247 693 12 203 908 
Financial liabilities
Contingent consideration liabilities— — (110)(110)— — (96)(96)
Derivative financial instruments
— (10)— (10)— (4)— (4)
Financial liabilities at fair value— (10)(110)(120)— (4)(96)(100)
(1)    As of December 31, 2024, included $11 million of Long-term convertible notes due from associated companies.
(2)    Recorded in Other non-current assets.
(3)    Recorded in Other current assets.
Financial liabilities
Contingent consideration liabilities
($ millions)20252024
Balance as of January 1(96)(90)
Additions(9)— 
Accretion for passage of time(5)(4)
Balance as of June 30(110)(94)
Disclosure of net value of unsettled positions for derivative forward contracts and swaps
The below table summarizes the net value of unsettled positions for currency derivatives contracts including swaps, forwards and options as of June 30, 2025 and December 31, 2024.
($ millions)June 30, 2025December 31, 2024
Unrealized gains in Other current assets
7 12 
Unrealized losses in Current financial debts
(10)(4)
Net value of unsettled positions for derivatives contracts
(3)8