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Other Non-Current Assets (Tables)
12 Months Ended
Dec. 31, 2021
Other Noncurrent Assets [Abstract]  
Other non-current assets
 
 
As of December 31
 
2021
2020
 
$ millions
$ millions
 
Non-current inventories
 149
 152
Surplus in employees' defined benefit plans (1)
 115
 91
Derivative designated as a cash flow hedge
 97
 115
Investments in equity-accounted investees
 26
 27
Other
16
8
 
403
393

 
  (1)
See Note 16.