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OTHER GAINS AND LOSSES - NET (Details) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2025
Mar. 31, 2024
Operating income and expenses    
Realized gains / (losses) on derivatives $ 6 $ (11)
Unrealized losses on derivatives at fair value though profit and loss - net (12) (4)
Unrealized exchange (losses) / gains from the remeasurement of monetary assets and liabilities – net (1) 2
Impairment of assets 0 (3)
Restructuring costs (1) 0
Losses on disposal 0 (1)
Result from the flood in Valais 4 0
Non-operating income and expenses    
Expenses on factoring arrangements (5) (5)
Pension and other post-employment benefits 3 3
Other 1 1
Total other gains and losses - net $ (5) $ (18)