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Debt - Senior Notes (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Debt Instrument [Line Items]
Repayments of PAA senior notes	$ 617	$ 1,000
PAA senior notes
Debt Instrument [Line Items]
Debt instrument face value	$ 9,100	$ 9,000
PAA senior notes | 3.80% senior notes due September 2030
Debt Instrument [Line Items]
Debt instrument, interest rate (as a percent)	3.80%
Offering price percentage	99.794%
Debt instrument face value	$ 750
PAA senior notes | 3.55% senior notes due December 2029
Debt Instrument [Line Items]
Debt instrument, interest rate (as a percent)	3.55%	3.55%
Offering price percentage		99.801%
Debt instrument face value		$ 1,000
PAA senior notes | 5.00% senior notes due February 2021
Debt Instrument [Line Items]
Debt instrument, interest rate (as a percent)	5.00%
Repayments of PAA senior notes	$ 600
PAA senior notes | 2.60% senior notes due December 2019
Debt Instrument [Line Items]
Debt instrument, interest rate (as a percent)		2.60%
Repayments of PAA senior notes		$ 500
PAA senior notes | 5.75% senior notes due January 2020
Debt Instrument [Line Items]
Debt instrument, interest rate (as a percent)		5.75%
Repayments of PAA senior notes		$ 500
Consolidated Finance Subsidiary Issuer
Debt Instrument [Line Items]
Consolidated subsidiary, ownership interest held by the parent (as a percent)	100.00%

X

- Definition

Percentage of face value at which senior notes are sold.

+ References

No definition available.

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Face (par) amount of debt instrument at time of issuance.

+ References

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
-Section 45
-Paragraph 2
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Contractual interest rate for funds borrowed, under the debt agreement.

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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The cash outflow for a long-term debt where the holder has highest claim on the entity's asset in case of bankruptcy or liquidation during the period.

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-Paragraph 15
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- Definition

The number of units or percentage investment held in the subsidiary by the limited liability company or limited partnership.

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