13 . rentals and leases the company leases sales and administrative office facilities , distribution centers , research and manufacturing facilities , as well as vehicles and other equipment under operating leases . total rental expense under the company 2019s operating leases was $ 239 million in 2017 and $ 221 million in both 2016 and 2015 . as of december 31 , 2017 , identifiable future minimum payments with non-cancelable terms in excess of one year were : ( millions ) .

Table:
2018 | $ 131
2019 | 115
2020 | 96
2021 | 86
2022 | 74
thereafter | 115
total | $ 617
the company enters into operating leases for vehicles whose non-cancelable terms are one year or less in duration with month-to-month renewal options .
these leases have been excluded from the table above .
the company estimates payments under such leases will approximate $ 62 million in 2018 .
these vehicle leases have guaranteed residual values that have historically been satisfied by the proceeds on the sale of the vehicles .
14 .
research and development expenditures research expenditures that relate to the development of new products and processes , including significant improvements and refinements to existing products , are expensed as incurred .
such costs were $ 201 million in 2017 , $ 189 million in 2016 and $ 191 million in 2015 .
the company did not participate in any material customer sponsored research during 2017 , 2016 or 2015 .
15 .
commitments and contingencies the company is subject to various claims and contingencies related to , among other things , workers 2019 compensation , general liability ( including product liability ) , automobile claims , health care claims , environmental matters and lawsuits .
the company is also subject to various claims and contingencies related to income taxes , which are discussed in note 12 .
the company also has contractual obligations including lease commitments , which are discussed in note 13 .
the company records liabilities where a contingent loss is probable and can be reasonably estimated .
if the reasonable estimate of a probable loss is a range , the company records the most probable estimate of the loss or the minimum amount when no amount within the range is a better estimate than any other amount .
the company discloses a contingent liability even if the liability is not probable or the amount is not estimable , or both , if there is a reasonable possibility that a material loss may have been incurred .
insurance globally , the company has insurance policies with varying deductibility levels for property and casualty losses .
the company is insured for losses in excess of these deductibles , subject to policy terms and conditions and has recorded both a liability and an offsetting receivable for amounts in excess of these deductibles .
the company is self-insured for health care claims for eligible participating employees , subject to certain deductibles and limitations .
the company determines its liabilities for claims on an actuarial basis .
litigation and environmental matters the company and certain subsidiaries are party to various lawsuits , claims and environmental actions that have arisen in the ordinary course of business .
these include from time to time antitrust , commercial , patent infringement , product liability and wage hour lawsuits , as well as possible obligations to investigate and mitigate the effects on the environment of the disposal or release of certain chemical substances at various sites , such as superfund sites and other operating or closed facilities .
the company has established accruals for certain lawsuits , claims and environmental matters .
the company currently believes that there is not a reasonably possible risk of material loss in excess of the amounts accrued related to these legal matters .
because litigation is inherently uncertain , and unfavorable rulings or developments could occur , there can be no certainty that the company may not ultimately incur charges in excess of recorded liabilities .
a future adverse ruling , settlement or unfavorable development could result in future charges that could have a material adverse effect on the company 2019s results of operations or cash flows in the period in which they are recorded .
the company currently believes that such future charges related to suits and legal claims , if any , would not have a material adverse effect on the company 2019s consolidated financial position .
environmental matters the company is currently participating in environmental assessments and remediation at approximately 45 locations , the majority of which are in the u.s. , and environmental liabilities have been accrued reflecting management 2019s best estimate of future costs .
potential insurance reimbursements are not anticipated in the company 2019s accruals for environmental liabilities. .

Question: total rental expense under the company 2019s operating leases changed by how much in millions between 2017 and 2018?
Answer: -108
Calculation: subtract(131, 239)