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Leased facilities (Tables) | 12 Months Ended
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Dec. 31, 2014
Schedule of Operating Leases | At December 31, 2014, the company held non-cancelable operating leases covering office buildings, rail cars, service stations and other properties with minimum undiscounted lease commitments totalling $494 million as indicated in the following table:
|  | Payments due by period |
millions of dollars |  | 2015 |  |  | 2016 |  |  | 2017 |  |  | 2018 |  |  | 2019 |  |  | After 2019 |  |  | Total |
Lease payments under minimum commitments (a) |  |  | 178 |  |  |  | 126 |  |  |  | 93 |  |  |  | 39 |  |  |  | 30 |  |  |  | 28 |  |  |  | 494 |
| (a) | Net rental cost under cancelable and non-cancelable operating leases incurred in 2014 was $315 million (2013 – $287 million, 2012 – $271 million). Related rental income was not material.

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- Definition Tabular disclosure of future minimum payments required in the aggregate and for each of the five succeeding fiscal years for operating leases having initial or remaining noncancelable lease terms in excess of one year and the total minimum rentals to be received in the future under noncancelable subleases as of the balance sheet date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 20 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6453985&loc=d3e41502-112717 + Details
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