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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
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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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- Definition 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. + References No definition available. + Details
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- Definition The number of shares (or other type of equity) under an equity-based award plan pertaining to grants made during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan) associated with the conversion of Series A and Series B subordinated units for which the vesting criteria was modified during the period. + References No definition available. + Details
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- Definition 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. + References No definition available. + Details
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- Definition Represents the expense recognized during the period arising from equity-based compensation arrangements (for example, shares of stock, unit, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(1)(i) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 123R -Paragraph A240 -Subparagraph g(1) -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5047-113901 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Staff Accounting Bulletin (SAB) -Number Topic 14 -Section F Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 123R -Paragraph 64 -Subparagraph b -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB TOPIC 14.F) -URI http://asc.fasb.org/extlink&oid=6793087&loc=d3e301413-122809 + Details
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