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Partners' Capital and Distributions - Distributions (Details) - USD ($) $ / shares in Units, $ in Millions						9 Months Ended
	Nov. 14, 2017	Oct. 10, 2017	Aug. 14, 2017	May 15, 2017	Feb. 14, 2017	Sep. 30, 2017	Sep. 30, 2016
Partners Capital and Distributions
Total distributions paid						$ 1,170	$ 1,302
Partners’ Capital Excluding Noncontrolling Interests
Partners Capital and Distributions
Total distributions paid						$ 1,168	$ 1,299
Common Units | Cash Distributions
Partners Capital and Distributions
Total distributions paid			$ 399	$ 399	$ 371
Distributions per common unit, paid (usd per unit)			$ 0.55	$ 0.55	$ 0.55
Common Units | Cash Distributions | Forecast
Partners Capital and Distributions
Total distributions paid	$ 218
Distributions per common unit, paid (usd per unit)	$ 0.30
Annualized distributions per common unit (usd per unit)	$ 1.20
Series A Preferred Units | Partners’ Capital Excluding Noncontrolling Interests | In-Kind Distributions
Partners Capital and Distributions
Distributions to unitholders			$ 35	$ 34	$ 34
Distribution of units in lieu of cash (units)			1,339,796	1,313,527	1,287,773
Series A Preferred Units | Partners’ Capital Excluding Noncontrolling Interests | In-Kind Distributions | Forecast
Partners Capital and Distributions
Distributions to unitholders	$ 36
Distribution of units in lieu of cash (units)	1,366,593
Public | Common Units | Cash Distributions
Partners Capital and Distributions
Distributions to unitholders			$ 240	$ 240	$ 237
Public | Common Units | Cash Distributions | Forecast
Partners Capital and Distributions
Distributions to unitholders	$ 132
AAP | Common Units | Cash Distributions
Partners Capital and Distributions
Distributions to unitholders			$ 159	$ 159	$ 134
AAP | Common Units | Cash Distributions | Forecast
Partners Capital and Distributions
Distributions to unitholders	$ 86
Subsequent event | Common Units | Cash Distributions
Partners Capital and Distributions
Annualized distributions declared per common unit (usd per unit)		$ 1.20

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

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
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Total distributions to each class of partners (i.e., general, limited and preferred partners).

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