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Equity Compensation Plans (Details) (USD $) In Millions, except Share data, unless otherwise specified	0 Months Ended	3 Months Ended		9 Months Ended			1 Months Ended				9 Months Ended
	Oct. 02, 2012	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012 AAP LP Class B Units	Feb. 29, 2012 PNG Long Term Incentive Plan Awards	Feb. 29, 2012 Awards associated with DERs that begin payment in February 2012	Feb. 29, 2012 Awards associated with DERs that begin payment in May 2013	Feb. 29, 2012 Awards associated with DERs that begin payment in May 2014	Sep. 30, 2012 Unit vestings with PNG common units	Sep. 30, 2011 Unit vestings with PNG common units
Equity Compensation Plans
Unit split conversion ratio	2
Impact to number of unvested LTIP awards due to stock split	doubled
Impact to number of units available for issuance under PAA LTIP	doubled
Percentage reduction in vesting arrangements	50.00%
Share-based Compensation Arrangement, by Share-based Payment Award
Award vesting rights (as a percent)							50.00%
Units with associated DERs (in units)								69,750	69,750	93,000
Annualized distribution threshold of units with associated DERs (in dollars per share)								$ 1.45	$ 1.50	$ 1.55
Phantom common units for which vesting criteria was modified (in units)							232,500
Phantom common units associated with the conversion of Series A and Series B subordinated units for which vesting criteria was modified (in units)							232,500
Reserved for Future Grants
Reserved for future grants outstanding, beginning balance (in units)						16,500
Unit forfeitures (in units)						1,000
Reserved for future grants outstanding, ending balance (in units)						17,500
Outstanding
Outstanding at the beginning of the period (in units)						183,500
Unit forfeitures (in units)						(1,000)
Outstanding at the ending of the period (in units)						182,500
Outstanding Units Earned
Outstanding Units Earned, beginning balance (in units)						80,063
Units earned (in units)						50,187
Outstanding Units Earned, end balance (in units)						130,250
Grant Date Fair Value of Outstanding Class B Units:
Grant Date Fair Value of Outstanding Class B Units, beginning balance						$ 44
Grant Date Fair Value of Outstanding Class B Units, ending balance						44
Other Consolidated Equity Compensation Information
Equity compensation expense		22	10	82	56	6
LTIP unit settled vestings		2	2	60	24						1	2
LTIP cash settled vestings		1		66	18
DER cash payments		$ 2	$ 1	$ 5	$ 3

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Percentage of awards that are no longer contingent on satisfaction of either a market condition or a performance condition, but are instead only contingent upon satsifaction of a service condition. For example, vesting may be expressed as being 25 percent of the shares under option on final vesting date.

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The number of outstanding awards on non-stock option plans for which the employer has issued equity instruments to an employee, including both employees who have and who have not yet satisfied service or performance criteria necessary to gain title to distributions to the shares.

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The number of authorized units of the general partnership that have not yet been granted/issued and are reserved for future grants.

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The increase in the number of shares reserved for issuance under non-option equity instrument agreements due to shares that were cancelled as a result of occurance of a terminating event.

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The impact to the number of outstanding shares due to a stock split during the period under the long-tem incentive plans.

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Aggregate cash paid by the entity during the period to settle equity instruments granted under equity-based payment arrangements.

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The number of non-vested equity-based payment instruments, excluding stock (or unit) options, that validly exist and are outstanding as of the balance sheet date.

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Number of shares under non-option equity instrument agreements that were cancelled as a result of occurrence of a terminating event.

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