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Partners' Capital and Distributions - Equity Offerings (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Partners Capital and Distributions
Issuance of units (in units)	22,133,904
Issuance of units, net proceeds	$ 1,121	$ 866	$ 477
General partners' proportionate capital contributions	23	18	25
Continuous and Underwritten Offerings | General Partner
Partners Capital and Distributions
General partners' proportionate capital contributions	$ 22	$ 18	$ 9
Continuous Offering Program
Partners Capital and Distributions
Issuance of units (in units)	1,133,904	15,375,810	8,644,807
Issuance of units, net proceeds	$ 59	$ 866	$ 477
Commissions to sales agents	$ 1	$ 9	$ 5
Underwritten Offering
Partners Capital and Distributions
Issuance of units (in units)	21,000,000
Issuance of units, net proceeds	$ 1,062

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Represents the costs incurred for commissions paid to the agent under the equity distribution agreement.

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Total change in each class of partners' capital accounts 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
-Section S99
-Paragraph 5
-URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187171-122770

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Section 04
-Article 3

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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
-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 3
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=6373374&loc=d3e70478-108055

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The cash inflow from an entity that is affiliated with the entity by means of direct or indirect ownership.

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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

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 14
-URI http://asc.fasb.org/extlink&oid=56944662&loc=d3e3255-108585

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