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Leases (Tables) | 6 Months Ended
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Jun. 30, 2019
Leases [Abstract] |
Total lease cost by class of underlying asset | Total lease cost by class of underlying asset was as follows (in millions):
| Pipelines, Terminals, and Tanks |  | Transportation |  | Feedstock Processing Equipment |  | Energy and Gases |  | Real Estate |  | Other |  | Total
|  | Marine |  | Rail |  |  |  |  |
Three months ended June 30, 2019: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Finance lease cost: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Amortization of ROU assets | $ | 12 |  |  | $ | — |  |  | $ | — |  |  | $ | 1 |  |  | $ | 1 |  |  | $ | — |  |  | $ | — |  |  | $ | 14 |
Interest on lease liabilities | 12 |  |  | — |  |  | — |  |  | 1 |  |  | 1 |  |  | — |  |  | — |  |  | 14 |
Operating lease cost | 47 |  |  | 34 |  |  | 13 |  |  | 5 |  |  | 2 |  |  | 10 |  |  | 2 |  |  | 113 |
Variable lease cost | 15 |  |  | 7 |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | 22 |
Short-term lease cost | 4 |  |  | 12 |  |  | — |  |  | 8 |  |  | — |  |  | — |  |  | — |  |  | 24 |
Sublease income | — |  |  | (15 | ) |  | — |  |  | — |  |  | — |  |  | (1 | ) |  | — |  |  | (16 | )
Total lease cost | $ | 90 |  |  | $ | 38 |  |  | $ | 13 |  |  | $ | 15 |  |  | $ | 4 |  |  | $ | 9 |  |  | $ | 2 |  |  | $ | 171 |
Six months ended June 30, 2019: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Finance lease cost: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Amortization of ROU assets | $ | 20 |  |  | $ | — |  |  | $ | — |  |  | $ | 2 |  |  | $ | 2 |  |  | $ | — |  |  | $ | — |  |  | $ | 24 |
Interest on lease liabilities | 22 |  |  | — |  |  | — |  |  | 1 |  |  | 2 |  |  | — |  |  | — |  |  | 25 |
Operating lease cost | 94 |  |  | 68 |  |  | 24 |  |  | 12 |  |  | 4 |  |  | 14 |  |  | 2 |  |  | 218 |
Variable lease cost | 33 |  |  | 17 |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | 50 |
Short-term lease cost | 7 |  |  | 26 |  |  | — |  |  | 14 |  |  | — |  |  | — |  |  | — |  |  | 47 |
Sublease income | — |  |  | (16 | ) |  | — |  |  | — |  |  | — |  |  | (2 | ) |  | — |  |  | (18 | )
Total lease cost | $ | 176 |  |  | $ | 95 |  |  | $ | 24 |  |  | $ | 29 |  |  | $ | 8 |  |  | $ | 12 |  |  | $ | 2 |  |  | $ | 346 |
Rental expense, net of sublease rental income | In accordance with Topic 840, “rental expense, net of sublease rental income” was as follows (in millions):
| Three Months Ended June 30, 2018 |  | Six Months Ended June 30, 2018
Minimum rental expense | $ | 122 |  |  | $ | 251 |
Contingent rental expense | 3 |  |  | 9 |
Total rental expense | 125 |  |  | 260 |
Less sublease rental income | 6 |  |  | 16 |
Rental expense, net of sublease rental income | $ | 119 |  |  | $ | 244 |
Additional information related to operating and finance leases | The following table presents additional information related to our operating and finance leases (in millions, except for lease terms and discount rates):
|  | June 30, 2019
|  | Operating Leases |  | Finance Leases
Supplemental balance sheet information: |  |  |  |
ROU assets, net reflected in the following balance sheet line items: |  |  |  |
Property, plant, and equipment, net |  | $ | — |  |  | $ | 773 |
Deferred charges and other assets, net |  | 1,385 |  |  | — |
Total ROU assets, net |  | $ | 1,385 |  |  | $ | 773 |
Current lease liabilities reflected in the following balance sheet line items: |  |  |  |
Current portion of debt and finance lease obligations |  | $ | — |  |  | $ | 40 |
Accrued expenses |  | 317 |  |  | — |
Noncurrent lease liabilities reflected in the following balance sheet line items: |  |  |  |
Debt and finance lease obligations, less current portion |  | — |  |  | 741 |
Other long-term liabilities |  | 1,029 |  |  | — |
Total lease liabilities |  | $ | 1,346 |  |  | $ | 781 |
Other supplemental information: |  |  |  |
Weighted-average remaining lease term |  | 8.3 years |  |  | 20.3 years |
Weighted-average discount rate |  | 5.0 | % |  | 5.3 | %
Remaining minimum lease payments due under long-term operating leases | The remaining minimum lease payments due under our long-term leases were as follows (in millions):
| June 30, 2019 |  | December 31, 2018
| Operating Leases |  | Finance Leases |  | Operating Leases |  | Capital Leases
2019 (a) | $ | 202 |  |  | $ | 44 |  |  | $ | 359 |  |  | $ | 69 |
2020 | 314 |  |  | 86 |  |  | 245 |  |  | 65 |
2021 | 222 |  |  | 84 |  |  | 178 |  |  | 62 |
2022 | 180 |  |  | 85 |  |  | 146 |  |  | 64 |
2023 | 148 |  |  | 87 |  |  | 123 |  |  | 65 |
Thereafter | 633 |  |  | 1,066 |  |  | 514 |  |  | 957 |
Total undiscounted lease payments | 1,699 |  |  | 1,452 |  |  | $ | 1,565 |  |  | 1,282 |
Less amount associated with discounting | 353 |  |  | 671 |  |  |  |  | 676 |
Total lease liabilities | $ | 1,346 |  |  | $ | 781 |  |  |  |  | $ | 606 |
____________________ (a) The amounts as of June 30, 2019 are for the remaining six months of 2019.
Remaining minimum lease payments due under long-term finance leases | The remaining minimum lease payments due under our long-term leases were as follows (in millions):
| June 30, 2019 |  | December 31, 2018
| Operating Leases |  | Finance Leases |  | Operating Leases |  | Capital Leases
2019 (a) | $ | 202 |  |  | $ | 44 |  |  | $ | 359 |  |  | $ | 69 |
2020 | 314 |  |  | 86 |  |  | 245 |  |  | 65 |
2021 | 222 |  |  | 84 |  |  | 178 |  |  | 62 |
2022 | 180 |  |  | 85 |  |  | 146 |  |  | 64 |
2023 | 148 |  |  | 87 |  |  | 123 |  |  | 65 |
Thereafter | 633 |  |  | 1,066 |  |  | 514 |  |  | 957 |
Total undiscounted lease payments | 1,699 |  |  | 1,452 |  |  | $ | 1,565 |  |  | 1,282 |
Less amount associated with discounting | 353 |  |  | 671 |  |  |  |  | 676 |
Total lease liabilities | $ | 1,346 |  |  | $ | 781 |  |  |  |  | $ | 606 |
____________________ (a) The amounts as of June 30, 2019 are for the remaining six months of 2019.

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- Definition Tabular disclosure of lessee's lease cost. Includes, but is not limited to, interest expense for finance lease, amortization of right-of-use asset for finance lease, operating lease cost, short-term lease cost, variable lease cost and sublease income. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=77888426&loc=SL77918686-209980 + Details
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- Definition Tabular disclosure of undiscounted cash flows of lessee's operating lease liability. Includes, but is not limited to, reconciliation of undiscounted cash flows to operating lease liability recognized in statement of financial position. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 50 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=77888426&loc=SL77918701-209980 + 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://fasb.org/us-gaap/role/ref/otherTransitionRef -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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