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Partners' Capital and Distributions - Equity Offerings (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Partners Capital and Distributions
Issuance of units (in units)	26,278,288	22,133,904
Issuance of units, net proceeds	$ 805	$ 1,121
General partners' proportionate capital contributions	42	23	$ 18
Continuous and Underwritten Offerings | General Partner
Partners Capital and Distributions
General partners' proportionate capital contributions	9	$ 22	$ 18
Continuous Offering Program
Partners Capital and Distributions
Issuance of units (in units)		1,133,904	15,375,810
Issuance of units, net proceeds		$ 59	$ 866
Commissions to sales agents	$ 8	$ 1	$ 9
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 1
-Subparagraph (SX 210.3-04)
-URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187085-122770

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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
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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
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