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Provisions and other current liabilities - Restructuring provisions (Details) - Restructuring provisions - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Reconciliation of changes in other provisions [abstract]      
January 1 $ 64 $ 17 $ 10
Additions 39 72 21
Cash payments (74) (24) (14)
Releases 0 (1) 0
December 31 $ 29 $ 64 $ 17