18 Commitments and contingent liabilities

Leasing commitments

As part of its normal business operations, the Group enters into a number of lease agreements. As of 31 December, such agreements, which are operating leases, total the following obligations for the next five years and thereafter:

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USD millions

2017

2018

128

2019

118

2020

100

2021

64

2022

57

After 2022

324

Total operating lease commitments

791

Less minimum non-cancellable sublease rentals

21

Total net future minimum lease commitments

770

Minimum rentals for all operating leases (except those with terms of one month or less that were not renewed) for the years ended 31 December 2016 and 2017 were USD 76 million and USD 94 million, respectively. Sublease rental income for the years ended 31 December 2016 and 2017 was nil and USD 2 million, respectively.

Other commitments

As a participant in limited and other investment partnerships, the Group commits itself to making available certain amounts of investment funding, callable by the partnerships for periods of up to ten years. The total commitments remaining uncalled as of 31 December 2017 were USD 2 252 million.

In 2016, the Group entered into a real estate construction contract. Total commitments under the contract amount to USD 52 million over the next three years.

The Group enters into a number of contracts in the ordinary course of reinsurance and financial services business which, if the Group’s credit rating and/or defined statutory measures decline to certain levels, would require the Group to post collateral or obtain guarantees. The contracts typically provide alternatives for recapture of the associated business.

Legal proceedings

In the normal course of business operations, the Group is involved in various claims, lawsuits and regulatory matters. In the opinion of management, the disposition of these matters is not expected to have a material adverse effect on the Group’s business, consolidated financial position, results of operations or cash flows.