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Partners' Capital and Distributions - Sale of Units (Details) - USD ($) $ in Millions	1 Months Ended	9 Months Ended
	Mar. 31, 2017	Sep. 30, 2017	Sep. 30, 2016
Subsidiary, Sale of Stock [Line Items]
Sale of common units, net proceeds		$ 1,664	$ 289
Common Units
Subsidiary, Sale of Stock [Line Items]
Sale of common units (units)		54,119,893
Sale of common units, net proceeds		$ 1,664
Common Units | Continuous Offering Program
Subsidiary, Sale of Stock [Line Items]
Sale of common units (units)		4,033,567
Sale of common units, net proceeds		$ 129
Commissions paid to sales agents		$ 1
Common Units | Omnibus Agreement
Subsidiary, Sale of Stock [Line Items]
Sale of common units (units)		50,086,326
Sale of common units, net proceeds		$ 1,535
Omnibus Agreement | Common Units | AAP | Continuous Offering Program
Subsidiary, Sale of Stock [Line Items]
Sale of common units (units)		1,800,000
Omnibus Agreement | Common Units | AAP | Underwritten Offering
Subsidiary, Sale of Stock [Line Items]
Sale of common units (units)	48,300,000

X

- Definition

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

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section S99
-Paragraph 5
-Subparagraph (SAB Topic 4.F)
-URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187171-122770

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X

- Definition

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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- Definition

The cash outflow for cost incurred directly with the issuance of an equity security.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 15
-URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3291-108585

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

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