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Leases - Narrative (Details) $ in Millions |  | 6 Months Ended | 12 Months Ended
--- | --- | --- | ---
Feb. 01, 2019 USD ($) contract | Jun. 30, 2019 USD ($) | Dec. 31, 2018
Lessee, Lease, Description [Line Items] |  |  |
Operating lease liability |  | $ 27 |
Operating lease, right-of-use asset |  | $ 25 |
Natural Gas Compressors | Midcon Compression, L.L.C. |  |  |
Lessee, Lease, Description [Line Items] |  |  |
Lease terms |  |  | 38 months
Wildhorse Resource Development Corporation |  |  |
Lessee, Lease, Description [Line Items] |  |  |
Operating lease liability | $ 40 |  |
Operating lease, right-of-use asset | 38 |  |
Lease incentive | $ 2 |  |
Number of leases | contract | 2 |  |
Minimum |  |  |
Lessee, Lease, Description [Line Items] |  |  |
Lease, remaining lease term |  | 1 month |
Maximum |  |  |
Lessee, Lease, Description [Line Items] |  |  |
Lease, remaining lease term |  | 7 years 6 months |

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- Definition This item represents the deferred charge for an incentive or inducement granted by a lessor to a lessee, in order to motivate the lessee to enter the lease agreement, which incentive or inducement is to be recognized as a reduction of rental revenue over the lease term. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 20 -Section 25 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=77902458&loc=d3e40019-112707 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 20 -Section 25 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=77902458&loc=d3e40010-112707 + 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=77888419&loc=SL77918627-209977 + Details
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