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Lease Commitments | 12 Months Ended
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Dec. 31, 2018
Leases [Abstract] |
Lease Commitments | Lease Commitments Certain noncancelable leases are classified as capital leases, and the leased assets are included as part of “Properties, plant and equipment, at cost” on the Consolidated Balance Sheet. Such leasing arrangements involve crude oil production and processing equipment, vessels, office buildings, and other facilities. Other leases are classified as operating leases and are not capitalized. The payments on operating leases are recorded as expense. Details of the capitalized leased assets are below:
| At December 31 |
| 2018 |  |  |  | 2017 |
Upstream | $ | 719 |  |  |  | $ | 678 |
Downstream | 99 |  |  |  | 99 |
All Other | — |  |  |  | — |
Total | 818 |  |  |  | 777 |
Less: Accumulated amortization | 617 |  |  |  | 515 |
Net capitalized leased assets | $ | 201 |  |  |  | $ | 262 |
Rental expenses incurred for operating leases during 2018, 2017 and 2016 were as follows:
| Year ended December 31 |
| 2018 |  |  |  | 2017 |  |  | 2016 |
Minimum rentals | $ | 820 |  |  |  | $ | 726 |  |  | $ | 943 |
Contingent rentals | 1 |  |  |  | 1 |  |  | 2 |
Total | 821 |  |  |  | 727 |  |  | 945 |
Less: Sublease rental income | 5 |  |  |  | 6 |  |  | 7 |
Net rental expense | $ | 816 |  |  |  | $ | 721 |  |  | $ | 938 |
Contingent rentals are based on factors other than the passage of time, principally sales volumes at leased service stations. Certain leases include escalation clauses for adjusting rentals to reflect changes in price indices, renewal options, and options to purchase the leased property during or at the end of the initial or renewal lease period for the fair market value or other specified amount at that time. At December 31, 2018, the estimated future minimum lease payments (net of noncancelable sublease rentals) under operating and capital leases, which at inception had a noncancelable term of more than one year, were as follows:
|  | At December 31 |
|  | Operating Leases |  |  |  | Capital Leases * |
Year | 2019 | $ | 540 |  |  |  | $ | 30 |
| 2020 | 492 |  |  |  | 22 |
| 2021 | 378 |  |  |  | 17 |
| 2022 | 242 |  |  |  | 16 |
| 2023 | 166 |  |  |  | 16 |
| Thereafter | 341 |  |  |  | 132 |
Total | $ | 2,159 |  |  |  | $ | 233 |
Less: Amounts representing interest and executory costs |  |  |  | $ | (88 | )
Net present values |  |  |  | 145 |
Less: Capital lease obligations included in short-term debt |  |  |  | (18 | )
Long-term capital lease obligations |  |  |  | $ | 127 |
* Excluded from the table is an executed but not-yet-commenced capital lease with payments of $14, $15, $22, $21, $21, and $219 for 2019, 2020, 2021, 2022, 2023, and thereafter, respectively.

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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/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -URI http://asc.fasb.org/subtopic&trid=77888251 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -URI http://asc.fasb.org/topic&trid=2208923 + Details
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