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Employee benefit obligations - Plan assets comprise (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Employee benefit obligations.    
Target return funds $ 93 $ 92
Bonds 49 73
Cash/other 59 54
Total Plan assets $ 201 $ 219
Target return funds (percentage) 47.00% 42.00%
Bonds (percentage) 24.00% 33.00%
Cash/other (percentage) 29.00% 25.00%
Total plan asset (percentage) 100.00% 100.00%