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Partners' Capital and Distributions - Distributions (Details) - USD ($) $ / shares in Units, $ in Millions				6 Months Ended
	Aug. 14, 2018	May 15, 2018	Feb. 14, 2018	Jun. 30, 2017
Partners Capital and Distribution [Line Items]
Total distributions paid				$ 771
Common Units | Cash Distribution
Partners Capital and Distribution [Line Items]
Total distributions paid		$ 218	$ 218
Distributions per common unit, paid (usd per unit)		$ 0.30	$ 0.30
Common Units | Cash Distribution | 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 Distribution
Partners Capital and Distribution [Line Items]
Distributions to common unitholders		$ 133	$ 133
Public | Common Units | Cash Distribution | Forecast
Partners Capital and Distribution [Line Items]
Distributions to common unitholders	$ 133
AAP | Common Units | Cash Distribution
Partners Capital and Distribution [Line Items]
Distributions to common unitholders		$ 85	$ 85
AAP | Common Units | Cash Distribution | 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).

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

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