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Lease Commitments (Tables) | 12 Months Ended
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Dec. 31, 2017
Leases [Abstract] |
Schedule of capitalized leased assets | Details of the capitalized leased assets are as follows:
| At December 31 |
| 2017 |  |  |  | 2016 |
Upstream | $ | 678 |  |  |  | $ | 676 |
Downstream | 99 |  |  |  | 99 |
All Other | — |  |  |  | — |
Total | 777 |  |  |  | 775 |
Less: Accumulated amortization | 515 |  |  |  | 383 |
Net capitalized leased assets | $ | 262 |  |  |  | $ | 392 |
Rental expenses incurred for operating leases | Rental expenses incurred for operating leases during 2017, 2016 and 2015 were as follows:
| Year ended December 31 |
| 2017 |  |  |  | 2016 |  |  | 2015 |
Minimum rentals | $ | 726 |  |  |  | $ | 943 |  |  | $ | 1,041 |
Contingent rentals | 1 |  |  |  | 2 |  |  | 2 |
Total | 727 |  |  |  | 945 |  |  | 1,043 |
Less: Sublease rental income | 6 |  |  |  | 7 |  |  | 9 |
Net rental expense | $ | 721 |  |  |  | $ | 938 |  |  | $ | 1,034 |
Estimated future minimum lease payments (net of noncancelable sublease rentals) under operating and capital leases | At December 31, 2017, 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 | 2018 | $ | 693 |  |  |  | $ | 26 |
| 2019 | 628 |  |  |  | 22 |
| 2020 | 474 |  |  |  | 13 |
| 2021 | 339 |  |  |  | 12 |
| 2022 | 223 |  |  |  | 11 |
| Thereafter | 538 |  |  |  | 142 |
Total | $ | 2,895 |  |  |  | $ | 226 |
Less: Amounts representing interest and executory costs |  |  |  | $ | (117 | )
Net present values |  |  |  | 109 |
Less: Capital lease obligations included in short-term debt |  |  |  | (15 | )
Long-term capital lease obligations |  |  |  | $ | 94 |

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- Definition The entire disclosure for capital leasing arrangements including, but not limited to, 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 840 -SubTopic 30 -URI http://asc.fasb.org/subtopic&trid=2209026 + Details
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- 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=77902758&loc=d3e41499-112717 + Details
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