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Leases | 12 Months Ended
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Dec. 31, 2019
Disclosure of leases [Abstract] |
Leases | 23 Leases Transition Refer to note 45 for additional information relating to our implementation of IFRS 16 “Leases” at 1 January 2019. Lessee arrangements We have made the following payments associated with leases during 2019:
Description of payment | 2019 US$m |  | Included within
Principal lease payments | 315 |  | Cash flows from financing activities
Interest payments on leases | 53 |  | Cash flows from operating activities
Payments for short-term leases | 327 |  | Net operating costs
Payments for variable lease components | 15 |  | Net operating costs
Payments for low value leases (>12 months in duration) | 1 |  | Net operating costs
Total lease payments | 711 |  |
23 Leases continued Lease liabilities The maturity profile of lease liabilities recognised at the balance sheet is:
| Note | 2019 US$m |  | 2018 US$m |
Lease liabilities(a) |  |  |  |  |
Due within 1 year |  | 349 |  | 5 |
Between 1 and 3 years |  | 424 |  | 10 |
Between 3 and 5 years |  | 226 |  | 18 |
More than 5 years |  | 671 |  | 12 |
Total undiscounted cash payments expected to be made |  | 1,670 |  | 45 |
Effect of discounting |  | (361 | ) | (1 | )
Present value of minimum lease payments | 22 | 1,309 |  | 44 |
(a) | Amounts for 2018 represent finance lease liabilities under IAS 17 “Leases”.
At 31 December 2019, commitments for leases not yet commenced were US$119 million; commitments relating to short-term leases which had already commenced at 31 December 2019 were US$108 million. As permitted by IFRS 16, short-term and low-value leases are not recognised on the balance sheet as a lease liability and are expensed as incurred. Lessor arrangements We sub-lease owned and right-of-use assets in cases where we no longer require the assets for our own use. At 31 December 2019 the Group recognised a net investment asset of US$63 million relating to the discounted value of cash expected to be received from assets leased out under finance leases (refer to note 18). During the year, we also recognised sub-lease income of US$5 million within net operating costs. This represents the income received in the year relating to assets subject to operating leases.

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- Definition The entire disclosure for leases. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 16 -IssueDate 2019-01-01 -Section Presentation -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=16&code=ifrs-tx-2019-en-r&doctype=Standard&dita_xref=IFRS16_g47-50_TI -URIDate 2019-03-27 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 16 -IssueDate 2019-01-01 -Section Disclosure -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=16&code=ifrs-tx-2019-en-r&doctype=Standard&dita_xref=IFRS16_g51-60_TI -URIDate 2019-03-27 + Details
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