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Partners' Capital (Cash Distributions) (Details) - USD ($) $ / shares in Units, $ in Millions	Feb. 14, 2018	Nov. 14, 2017	Aug. 15, 2017	May 16, 2017	Feb. 16, 2017	Nov. 15, 2016	Aug. 15, 2016	May 16, 2016	Feb. 16, 2016	Nov. 27, 2015	Aug. 28, 2015	May 29, 2015	Feb. 27, 2015	Dec. 31, 2017
Distribution Made To Limited Partner [Line Items]
Per Unit Distribution (in dollars per share)		$ 825.5	$ 825.5	$ 825.5	$ 825.5	$ 825.5	$ 825.5	$ 817.3	$ 801.3	$ 745.4	$ 693.4	$ 645.0	$ 600.0
Subsequent Event [Member]
Distribution Made To Limited Partner [Line Items]
Per Unit Distribution (in dollars per share)	$ 825.5
Series A Preferred Unit [Member]
Distribution Made To Limited Partner [Line Items]
Preferred Unit, Quarterly Distribution		$ 7	$ 8											$ 8
Series A Preferred Unit [Member] | Subsequent Event [Member]
Distribution Made To Limited Partner [Line Items]
Preferred Unit, Quarterly Distribution	$ 8

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- Definition

Per unit of ownership amount of cash distributions paid to unit-holder of a limited partnership (LP).

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.3-04)
-URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187085-122770

Reference 2: 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

Reference 3: 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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