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Leases
 12 Months Ended
Dec. 31, 2021
Disclosure of leases [Abstract]  
Leases
22 Leases
Lessee arrangements
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 

Lease liabilities
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 
At 31 December 2021, commitments for leases not yet commenced were US$476 million (2020: US$125 million); commitments relating to short-term leases which had already commenced at 31 December 2021 were US$165 million (2020: US$155 million). Short-term and low value leases are not recognised on the balance sheet as a lease liability and are expensed as incurred.