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Leases (Tables)
 12 Months Ended
Dec. 31, 2021
Disclosure of leases [Abstract]  
Disclosure of additional information about leasing activities for lessee We have made the following payments associated with leases:
Description of payment
2021
US$m		2020
US$m
Included within
Principal lease payments358 324 Cash flows from financing activities
Interest payments on leases48 50 Cash flows from operating activities
Payments for short-term leases502 314 Net operating costs
Payments for variable lease components34 30 Net operating costs
Payments for low value leases (>12 months in duration)2 1 Net operating costs
Total lease payments944 719 
Summary of capitalised finance leases The maturity profile of lease liabilities recognised at the balance sheet date is:

Note
2021
US$m
2020
US$m
Lease liabilities
Due within 1 year
361 271 
Between 1 and 3 years
440 386 
Between 3 and 5 years
226 185 
More than 5 years
704 724 
Total undiscounted cash payments expected to be made
1,731 1,566 
Effect of discounting
(368)(388)
Present value of minimum lease payments
211,363 1,178