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Partners' Capital and Distributions - AAP Distributions (Details) - USD ($) $ in Millions		12 Months Ended
	Feb. 12, 2021	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
AAP | Cash Distribution
Partners Capital and Distribution [Line Items]
Distributions to noncontrolling interests		$ 57	$ 141	$ 150
Distributions to PAGP		166	231	189
Distributions paid to limited partners		223	372	$ 339
Red River Pipeline Company LLC
Partners Capital and Distribution [Line Items]
Distributions to noncontrolling interests		$ 10	$ 6
Fourth quarter distribution | AAP | Cash Distribution | Subsequent Event
Partners Capital and Distribution [Line Items]
Distributions to noncontrolling interests	$ 9
Distributions to PAGP	35
Distributions paid to limited partners	$ 44

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-Publisher FASB
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The total amount of distributions to limited partners.

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Decrease in noncontrolling interest balance from payment of dividends or other distributions by the non-wholly owned subsidiary or partially owned entity, included in the consolidation of the parent entity, to the noncontrolling interest holders.

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