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Partners' Capital and Distributions - Distributions (Details) - USD ($) $ / shares in Units, $ in Millions			3 Months Ended
	May 15, 2018	Feb. 14, 2018	Mar. 31, 2017
Partners Capital and Distribution [Line Items]
Total distributions paid			$ 372
Common Units | Cash Distributions
Partners Capital and Distribution [Line Items]
Total distributions paid		$ 218
Distributions per common unit, paid (usd per unit)		$ 0.30
Common Units | Cash Distributions | Forecast
Partners Capital and Distribution [Line Items]
Total distributions paid	$ 218
Distributions per common unit, paid (usd per unit)	$ 0.30
Public | Common Units | Cash Distributions
Partners Capital and Distribution [Line Items]
Distributions to common unitholders		$ 133
Public | Common Units | Cash Distributions | Forecast
Partners Capital and Distribution [Line Items]
Distributions to common unitholders	$ 133
AAP | Common Units | Cash Distributions
Partners Capital and Distribution [Line Items]
Distributions to common unitholders		$ 85
AAP | Common Units | Cash Distributions | Forecast
Partners Capital and Distribution [Line Items]
Distributions to common unitholders	$ 85

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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)
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-Publisher FASB
-Name Accounting Standards Codification
-Topic 272
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The total amount of distributions to limited partners.

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Reference 1: 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)
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Total distributions to each class of partners (i.e., 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
-Subparagraph (SAB Topic 4.F)
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