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Commitments and Contingencies (Tables) | 12 Months Ended
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Dec. 31, 2017
Commitments and Contingencies Disclosure [Abstract] |
Schedule of future non-cancelable commitments | Future non-cancelable commitments related to these items at December 31, 2017 are summarized below (in millions):
| 2018 |  | 2019 |  | 2020 |  | 2021 |  | 2022 |  | Thereafter |  | Total
Leases, rights-of-way easements and other (1) | $ | 188 |  |  | $ | 155 |  |  | $ | 127 |  |  | $ | 107 |  |  | $ | 90 |  |  | $ | 363 |  |  | $ | 1,030 |
Other commitments (2) | 205 |  |  | 178 |  |  | 145 |  |  | 127 |  |  | 109 |  |  | 299 |  |  | 1,063 |
Total | $ | 393 |  |  | $ | 333 |  |  | $ | 272 |  |  | $ | 234 |  |  | $ | 199 |  |  | $ | 662 |  |  | $ | 2,093 |
(1) | Includes operating and capital leases as defined by FASB guidance, as well as obligations for rights-of-way easements. Leases are primarily for (i) railcars, (ii) land and surface rentals, (iii) office buildings, (iv) pipeline assets and (v) vehicles and trailers. We recognize expense on a straight-line basis over the life of the agreement, as applicable. Lease expense for 2017, 2016 and 2015 was $207 million, $198 million and $164 million, respectively.
(2) | Primarily includes third-party storage and transportation agreements and pipeline throughput agreements, as well as approximately $760 million associated with an agreement to transport crude oil on a pipeline that is owned by an equity method investee, in which we own a 50% interest. Our commitment to transport is supported by crude oil buy/sell agreements with third parties (including Oxy) with commensurate quantities. Expense associated with these storage, transportation and throughput agreements was approximately $197 million, $157 million and $85 million for 2017, 2016 and 2015, respectively.

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- Definition Tabular disclosure of the aggregate amount of payments due on known contractual obligations for the five years following the date of the latest balance sheet and the combined aggregate amount of maturities of known contractual obligations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6802200&loc=d3e1835-112601 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-K (SK) -Number 229 -Section 303 -Paragraph a -Subparagraph 5 + Details
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