Partners' Capital Narrative (Details) - USD ($) $ in Millions	3 Months Ended
Mar. 31, 2017	Dec. 31, 2016
Schedule of Partners' Capital [Line Items]
Percentage of membership interest acquired	100.00%
Common Units - Public [Member]
Schedule of Partners' Capital [Line Items]
Limited Partners' Capital Account, Units Outstanding	53,704,891	52,430,220
Common Units [Member]
Schedule of Partners' Capital [Line Items]
Limited Partners' Capital Account, Units Outstanding	99,455,717	98,181,046
Partners' Capital Account, Public Sale of Units, Amount Authorized	$ 400
Partners' Capital Account, Units, Sale of Units	1,268,750
Partners' Capital Account, Private Placement of Units	$ 33
Payments of Stock Issuance Costs	0
Equity Distribution, Remaining Available Authorized Amount	$ 295
Parent Company [Member]
Schedule of Partners' Capital [Line Items]
Percentage of membership interest acquired	46.00%
Parent Company [Member] \| Common Units [Member]
Schedule of Partners' Capital [Line Items]
Limited Partners' Capital Account, Units Outstanding	45,750,826

Equity Distribution, Remaining Available Authorized Amount

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Partners' Capital Account, Public Sale of Units, Amount Authorized

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Schedule of partners capital.

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

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-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

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- Definition

The number of limited partner units outstanding.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 272
-SubTopic 10
-Section 50
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=6373374&loc=d3e70434-108055

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Monetary value of the issuance of new units of limited partnership interest in a private placement.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
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Total units issued during the year due to the sale of units. All partners include general, limited and preferred partners.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
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The cash outflow for cost incurred directly with the issuance of an equity security.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Glossary Financing Activities
-URI http://asc.fasb.org/extlink&oid=6513228

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