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Partners' Capital and Distributions - Distributions (Details) - USD ($) $ / shares in Units, $ in Millions					3 Months Ended		9 Months Ended
	Nov. 14, 2019	Aug. 14, 2019	May 15, 2019	Feb. 14, 2019	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Partners Capital and Distribution [Line Items]
Total distributions paid					$ 315	$ 267	$ 894	$ 802
Common Units | Cash Distribution
Partners Capital and Distribution [Line Items]
Total distributions paid		$ 262	$ 262	$ 218
Distributions per common unit, paid (usd per unit)		$ 0.36	$ 0.36	$ 0.30
Common Units | Cash Distribution | Forecast
Partners Capital and Distribution [Line Items]
Total distributions paid	$ 262
Distributions per common unit, paid (usd per unit)	$ 0.36
Public | Common Units | Cash Distribution
Partners Capital and Distribution [Line Items]
Distributions to common unitholders		$ 166	$ 161	$ 134
Public | Common Units | Cash Distribution | Forecast
Partners Capital and Distribution [Line Items]
Distributions to common unitholders	$ 171
AAP | Common Units | Cash Distribution
Partners Capital and Distribution [Line Items]
Distributions to common unitholders		$ 96	$ 101	$ 84
AAP | Common Units | Cash Distribution | Forecast
Partners Capital and Distribution [Line Items]
Distributions to common unitholders	$ 91

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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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The total amount of distributions to limited partners.

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Total distributions to each class of partners (i.e., general, limited and preferred partners).

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