Description of the Business [Line Items]

No definition available.

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- Definition

Combined amount of lessee's right of use assets under both operating and finance leases.

+ References

No definition available.

+ Details

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Period Type:	instant

- Definition

Percentage investment held by the managing member or general partner of the limited liability company (LLC) or limited partnership (LP).

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 272
-SubTopic 10
-Section 50
-Paragraph 3
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=6373374&loc=d3e70478-108055

+ Details

Name:	us-gaap_LimitedLiabilityCompanyLLCOrLimitedPartnershipLPManagingMemberOrGeneralPartnerOwnershipInterest
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Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Percentage investment held by members or limited partners of limited liability company (LLC) or limited partnership (LP).

+ References

+ Details

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Balance Type:	na
Period Type:	duration

- 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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Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Details

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- Details

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- Details

Name:	us-gaap_RelatedPartyTransactionsByRelatedPartyAxis=us-gaap_LimitedPartnerMember
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Operations and Organizaton (Details) - USD ($) $ in Millions	6 Months Ended
	Jun. 30, 2018	Mar. 31, 2019	Jan. 01, 2019
Description of the Business
Operating Lease, Liability		$ 5	$ 6
Panhandle [Member] \| General partnership
Description of the Business
General partnership interest	1.00%
Panhandle [Member] \| Limited partner
Description of the Business
Limited partnership interest	99.00%
Accounting Standards Update 2016-02 [Member]
Description of the Business
Lease, Right of Use Asset, Net			$ 6