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Rental Expense and Lease Commitments | 12 Months Ended
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Dec. 31, 2017
Leases, Operating [Abstract] |
Rental Expense and Lease Commitments | Rental Expense and Lease Commitments Rentals of space, vehicles, manufacturing equipment and office and data processing equipment under operating leases were approximately $372 million, $330 million and $316 million in 2017, 2016 and 2015, respectively. The approximate minimum rental payments required under operating leases that have initial or remaining non-cancelable lease terms in excess of one year at December 31, 2017 are: (Dollars in Millions)
2018 |  | 2019 |  | 2020 |  | 2021 |  | 2022 |  | After 2022 |  | Total
$227 |  | 184 |  | 143 |  | 106 |  | 76 |  | 103 |  | 839
Commitments under capital leases are not significant.

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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/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -URI http://asc.fasb.org/subtopic&trid=77888251 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -URI http://asc.fasb.org/topic&trid=2208923 + Details
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- References No definition available. + Details
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