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Commitments and Contingencies (Tables) | 12 Months Ended
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Dec. 31, 2018
Commitments and Contingencies Disclosure [Abstract] |
Schedule of future non-cancelable commitments | Future noncancelable commitments related to these items at December 31, 2018 are summarized below (in millions):
| 2019 |  | 2020 |  | 2021 |  | 2022 |  | 2023 |  | Thereafter |  | Total
Leases, rights-of-way easements and other (1) | $ | 167 |  |  | $ | 133 |  |  | $ | 109 |  |  | $ | 93 |  |  | $ | 68 |  |  | $ | 341 |  |  | $ | 911 |
Other commitments (2) | 220 |  |  | 174 |  |  | 147 |  |  | 122 |  |  | 107 |  |  | 181 |  |  | 951 |
Total | $ | 387 |  |  | $ | 307 |  |  | $ | 256 |  |  | $ | 215 |  |  | $ | 175 |  |  | $ | 522 |  |  | $ | 1,862 |
(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 2018, 2017 and 2016 was $199 million, $207 million and $198 million, respectively.
(2) | Primarily includes third-party storage and transportation agreements and pipeline throughput agreements, as well as approximately $750 million associated with an agreement to transport crude oil at posted tariff rates 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 $228 million, $197 million and $157 million for 2018, 2017 and 2016, 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://fasb.org/us-gaap/role/ref/legacyRef -Publisher SEC -Name Regulation S-K (SK) -Number 229 -Section 303 -Paragraph a -Subparagraph 5 + Details
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