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Leases (Tables) | 12 Months Ended
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Dec. 31, 2017
Leases |
Summary of net rental expense for operating leases | The following table is a summary of the Company’s net rental expense for operating leases for the years ended December 31:
In millions |  | 2017 |  | 2016 |  | 2015
Minimum rentals |  | $ | 2,455 |  | $ | 2,418 |  | $ | 2,317
Contingent rentals |  |  | 29 |  |  | 35 |  |  | 34
|  |  | 2,484 |  |  | 2,453 |  |  | 2,351
Less: sublease income |  |  | (24) |  |  | (24) |  |  | (22)
|  | $ | 2,460 |  | $ | 2,429 |  | $ | 2,329
Summary of future minimum lease payments under capital and operating leases | The following table is a summary of the future minimum lease payments under capital and operating leases as of December 31, 2017:
|  | Capital |  | Operating
In millions |  | Leases |  | Leases(1)
2018 |  | $ | 74 |  | $ | 2,493
2019 |  |  | 74 |  |  | 2,361
2020 |  |  | 74 |  |  | 2,201
2021 |  |  | 73 |  |  | 2,072
2022 |  |  | 73 |  |  | 1,934
Thereafter |  |  | 974 |  |  | 16,090
Total future lease payments (2) |  |  | 1,342 |  | $ | 27,151
Less: imputed interest |  |  | (672) |  |  |
Present value of capital lease obligations |  | $ | 670 |  |  |
| (1) |  | Future operating lease payments have not been reduced by minimum sublease rentals of $171 million due in the future under noncancelable subleases.
| (2) |  | The Company leases pharmacy and clinic space from Target. Amounts related to such capital and operating leases are reflected above. Amounts due in excess of the remaining estimated economic life of the buildings of approximately $1.9 billion are not reflected herein since the estimated economic life of the buildings is shorter than the contractual term of the lease arrangement.

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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 non-cancelable lease terms in excess of one year. It also represents tabular disclosure of future minimum lease payments as of the date of the latest balance sheet presented, in aggregate and for each of the five years succeeding fiscal years, with separate deductions from the total for the amount representing executor costs, including any profit thereon, included in the minimum lease payments and for the amount of the imputed interest necessary to reduce the net minimum lease payments to present value. + References No definition available. + Details
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- Definition Tabular disclosure of rental expense from operating leases for each period for which an income statement is presented with separate amounts for minimum rentals, contingent rentals, and sublease rentals. Rental payments under leases with terms of a month or less that were not renewed need not be included. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6453985&loc=d3e41499-112717 + Details
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