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Partners' Capital and Distributions - PAA Distributions (Details) - PAA - USD ($) $ / shares in Units, $ in Millions			12 Months Ended
	Feb. 12, 2021	Jan. 07, 2021	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Partners Capital and Distribution [Line Items]
Percentage of available cash distributed			100.00%
Number of days after end of quarter within which distributions must be paid to unitholders			45 days
Cash Distribution | Series A Preferred Units
Partners Capital and Distribution [Line Items]
Total distribution amount			$ 149	$ 149	$ 112
Cash Distribution | Series B Preferred Units
Partners Capital and Distribution [Line Items]
Total distribution amount			49	49	49
Cash Distribution | Common Units
Partners Capital and Distribution [Line Items]
Distributions paid to limited partners			$ 655	$ 1,004	$ 871
Distributions per common unit (in dollars per share)			$ 0.90	$ 1.38	$ 1.20
Cash Distribution | Common Units | Subsequent Event
Partners Capital and Distribution [Line Items]
Distributions paid to limited partners	$ 130
Distributions per common unit (in dollars per share)		$ 0.18
Unit Distribution | Series A Preferred Units
Partners Capital and Distribution [Line Items]
Distribution made to limited partner, unit distributions paid (in units)			0	0	1,393,926
Distributions paid to limited partners					$ 37
Public | Cash Distribution | Common Units
Partners Capital and Distribution [Line Items]
Distributions paid to limited partners			$ 432	$ 632	532
AAP | Cash Distribution | Common Units
Partners Capital and Distribution [Line Items]
Distributions paid to limited partners			$ 223	372	$ 339
AAP | Fourth quarter distribution | Cash Distribution | Common Units | Subsequent Event
Partners Capital and Distribution [Line Items]
Distributions paid to limited partners	44
Other current liabilities | Series B Preferred Units
Partners Capital and Distribution [Line Items]
Distributions payable				$ 6
Other current liabilities | Cash Distribution | Series A Preferred Units | Subsequent Event
Partners Capital and Distribution [Line Items]
Distributions paid to limited partners	$ 37

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The number of days after the end of the relevant quarter within which distributions of available cash must be paid to unitholders.

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

+ References

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Carrying value as of the balance sheet date of dividends declared but unpaid on equity securities issued by the entity and outstanding.

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