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Lease Commitments | 12 Months Ended
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Dec. 31, 2018
Leases [Abstract] |
Lease Commitments | Lease Commitments We lease properties and equipment for use in our operations. In addition to rent, the leases may require us to pay directly for taxes, insurance, maintenance and other operating expenses or to pay higher rent when operating expenses increase. Rental expense, net of sublease income, was $301 million in 2018, $314 million in 2017 and $292 million in 2016.
The future minimum rental commitments under non-cancelable operating leases follow:
(MILLIONS OF DOLLARS) |  | 2019 |  |  | 2020 |  |  | 2021 |  |  | 2022 |  |  | 2023 |  |  | After 2023 |
Lease commitments |  | $ | 300 |  |  | $ | 252 |  |  | $ | 210 |  |  | $ | 267 |  |  | $ | 248 |  |  | $ | 2,040 |

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- Definition The entire disclosure for lessee entity's leasing arrangements including, but not limited to, all of the following: (a.) The basis on which contingent rental payments are determined, (b.) The existence and terms of renewal or purchase options and escalation clauses, (c.) Restrictions imposed by lease agreements, such as those concerning dividends, additional debt, and further leasing. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -URI http://asc.fasb.org/subtopic&trid=77888251 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -URI http://asc.fasb.org/topic&trid=2208923 + Details
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