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Leases - Balance Sheet Summary (Details) - USD ($) $ in Millions | Jun. 30, 2020 | Dec. 31, 2019
--- | --- | ---
Operating Leases: |  |
Lease liability | $ 42 |
Finance Leases: |  |
Lease liability | 63 |
Pipeline and storage |  |
Operating Leases: |  |
ROU assets, net | 17 | $ 20
Lease liability | 19 | 22
Finance Leases: |  |
ROU assets, net | 28 | 29
Lease liability | 39 | 40
Railcars |  |
Operating Leases: |  |
ROU assets, net | 10 | 12
Lease liability | 10 | 12
Real estate and other |  |
Operating Leases: |  |
ROU assets, net | 15 | 16
Lease liability | 13 | 14
Finance Leases: |  |
ROU assets, net | 23 | 24
Lease liability | $ 24 | $ 25

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- Definition Amount, after accumulated amortization, of right-of-use asset from finance lease. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 45 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=121603541&loc=SL77918627-209977 + Details
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- Definition Present value of lessee's discounted obligation for lease payments from operating lease. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 45 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=121603541&loc=SL77918627-209977 + Details
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- Definition Amount of lessee's right to use underlying asset under operating lease. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 45 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=121603541&loc=SL77918627-209977 + Details
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