Net Income Per Limited Partner Unit (Details) (USD $) In Millions, except Per Share data, unless otherwise specified	3 Months Ended	6 Months Ended
Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013
Basic and Diluted Net Income Per Limited Partner Unit
General partner ownership interest (as a percent)			2.00%
Numerator for Basic and Diluted Net Income per Limited Partner Unit:
Net income attributable to PAA	$ 287	$ 292	$ 671	$ 821
Net income available to limited partners	166	197	435	631
Denominator for Basic and Diluted Net Income per Limited Partner Unit:
Basic weighted average number of limited partner units outstanding (in units)	365	340	363	338
Effect of dilutive securities:
Weighted average LTIP units (in units)	2	2	2	3
Diluted weighted average number of limited partner units outstanding (in units)	367	342	365	341
Basic and Diluted Net Income per Limited Partner Unit
Basic net income per limited partner unit (in dollars per unit)	$ 0.45	$ 0.58	$ 1.19	$ 1.85
Diluted net income per limited partner unit (in dollars per unit)	$ 0.45	$ 0.57	$ 1.18	$ 1.84
Basic Net Income Per Limited Partner Unit
Numerator for Basic and Diluted Net Income per Limited Partner Unit:
Net income attributable to PAA	287	292	671	821
Less: General partner's incentive distribution	(117)	(91)	(227)	(177)
Less: General partner 2% ownership	(4)	(4)	(9)	(13)
Net income available to limited partners	166	197	435	631
Less: Undistributed earnings allocated and distributions to participating securities	(1)	(1)	(3)	(5)
Net income available to limited partners in accordance with application of the two-class method for MLPs	165	196	432	626
Diluted Net Income Per Limited Partner Unit
Numerator for Basic and Diluted Net Income per Limited Partner Unit:
Net income attributable to PAA	287	292	671	821
Less: General partner's incentive distribution	(117)	(91)	(227)	(177)
Less: General partner 2% ownership	(4)	(4)	(9)	(13)
Net income available to limited partners	166	197	435	631
Less: Undistributed earnings allocated and distributions to participating securities	(1)	(1)	(3)	(3)
Net income available to limited partners in accordance with application of the two-class method for MLPs	$ 165	$ 196	$ 432	$ 628

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Amount of incentive distribution paid or to be paid to the general partner based on current period earnings.

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The general partner's ownership allocation of net income attributable to the parent after the incentive distribution is paid.

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This element represents the net income (loss) available to limited partners after making an adjustment in accordance with the application of the two-class method for Master Limited Partnerships (MLPs).

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Percentage investment held by the managing member or general partner of the limited liability company (LLC) or limited partnership (LP).

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The portion of profit or loss for the period, net of income taxes, which is attributable to the parent.

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Aggregate amount of net income allocated to limited partners.

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Per unit of ownership amount after tax of income (loss) available to limited partnership (LP) unit-holder and units that would have been outstanding assuming the issuance of limited partner units for dilutive potential units outstanding.

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Per unit of ownership amount after tax of income (loss) available to outstanding limited partnership (LP) unit-holder.

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Aggregate of earnings distributed and earnings allocated to participating securities under the two-class method to the extent that participating securities may share in earnings as if all of the earnings for the period had been distributed.

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Weighted average number of limited partnership units outstanding determined by relating the portion of time within a reporting period that general partnership units have been outstanding to the total time in that period.

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Weighted average number of limited partnership units outstanding determined by relating the portion of time within a reporting period that limited partnership units have been outstanding to the total time in that period. Used in the calculation of diluted net income or loss per limited partnership unit.

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The sum of dilutive potential limited partnership units used in the calculation of the diluted per-unit computation.

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