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Equity Compensation Plans (Details 3) (USD $) In Millions, except Share data, unless otherwise specified | 0 Months Ended | 12 Months Ended | 1 Months Ended | 12 Months Ended
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Oct. 02, 2012 | Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2010 | Dec. 31, 2012 PAA Long-term Incentive Plan Awards | Dec. 31, 2011 PAA Long-term Incentive Plan Awards | Dec. 31, 2010 PAA Long-term Incentive Plan Awards | Dec. 31, 2012 PNG LTIP Awards Including Transaction Grants | Dec. 31, 2011 PNG LTIP Awards Including Transaction Grants | Dec. 31, 2010 PNG LTIP Awards Including Transaction Grants | Dec. 31, 2012 PNG LTIP Awards Including Transaction Grants Maximum | Dec. 31, 2010 PNG LTIP Awards Including Transaction Grants Maximum | Sep. 30, 2010 PNG Transaction Grants | Dec. 31, 2012 PNG Transaction Grants
Share-based Compensation Arrangement, by Share-based Payment Award |  |  |  |  |  |  |  |  |  |  |  |  |  |
Accrued liability related to all outstanding LTIP awards and DERs |  | $ 90 | $ 138 |  |  |  |  |  |  |  |  |  |  |
Short-term accrued liability related to all outstanding LTIP awards and DERs |  | 44 |  |  |  |  |  |  |  |  |  |  |  |
Long-term accrued liability related to all outstanding LTIP awards and DERs |  | 46 |  |  |  |  |  |  |  |  |  |  |  |
Equity compensation expense |  |  |  |  |  |  |  |  |  |  |  | $ 1 |  |
Outstanding (in units) |  |  |  |  |  |  |  |  |  |  |  |  |  |
Outstanding at beginning of period (in units) |  |  |  |  | 8,000,000 | 8,800,000 | 7,800,000 | 800,000 | 1,000,000 |  |  |  |  |
Granted (in units) |  |  |  |  | 1,500,000 | 1,000,000 | 4,000,000 | 100,000 |  | 1,100,000 |  |  | 375,000 |
Vested (in units) |  |  |  |  | (3,200,000) | (1,400,000) | (2,200,000) |  | (100,000) |  | (100,000) |  |  | (125,000)
Cancelled or forfeited (in units) |  |  |  |  | (300,000) | (400,000) | (800,000) |  | (100,000) | (100,000) |  |  |  |
Outstanding at end of period (in units) |  |  |  |  | 6,000,000 | 8,000,000 | 8,800,000 | 900,000 | 800,000 | 1,000,000 |  |  |  |
Annualized distribution probable of occurring |  |  |  |  | $ 2.45 | $ 2.175 |  |  |  |  |  |  |  |
Weighted Average Grant Date Fair Value per unit |  |  |  |  |  |  |  |  |  |  |  |  |  |
Outstanding at beginning of period (in dollars per unit) |  |  |  |  | $ 21.77 | $ 20.85 | $ 18.20 | $ 20.55 | $ 20.55 |  |  |  |  |
Granted (in dollars per unit) |  |  |  |  | $ 33.90 | $ 27.53 | $ 22.83 | $ 15.33 |  | $ 20.49 |  |  |  |
Vested (in dollars per unit) |  |  |  |  | $ 19.82 | $ 20.34 | $ 16.10 | $ 23.64 | $ 23.62 |  |  |  |  |
Cancelled or forfeited (in dollars per unit) |  |  |  |  | $ 29.36 | $ 20.99 | $ 17.81 |  | $ 19.20 | $ 19.22 |  |  |  |
Outstanding at end of period (in dollars per unit) |  |  |  |  | $ 25.55 | $ 21.77 | $ 20.85 | $ 17.49 | $ 20.55 | $ 20.55 |  |  |  |
Units issued in connection with the settlement of vested awards, net of tax withholding (in units) |  | 1,000,000 | 400,000 | 600,000 | 1,000,000 |  |  |  |  |  |  |  |  |
Units withheld for taxes (in units) |  | 500,000 | 200,000 | 400,000 | 500,000 |  |  |  |  |  |  |  |  |
Vested awards settled in cash (in units) |  | 1,700,000 | 800,000 | 1,200,000 | 1,700,000 |  |  |  |  |  |  |  |  |
Unit split conversion ratio | 2 |  |  |  |  |  |  |  |  |  |  |  |  |

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- Definition Represents the vested units which were settled in cash during the reporting period as a result of any share-based compensation plan other than an employee stock ownership plan. + References No definition available. + Details
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- Definition The number of equity-based payment instruments, excluding stock (or unit) options, that were forfeited during the reporting period. + 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 (c)(1)(iv)(3) -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 b(2)(e) -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. + Details
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- Definition Weighted average fair value as of the grant date of equity-based award plans other than stock (unit) option plans that were not exercised or put into effect as a result of the occurrence of a terminating event. + 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 (c)(2)(iii)(3) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The number of 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). + 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 (c)(2)(iii)(1) -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 b(2)(c) -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. + Details
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- Definition 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. + 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 (c)(2)(i)-(ii) -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 b(2)(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 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 123R -Paragraph A240 -Subparagraph b(2)(a) -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. + Details
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- Definition The weighted average fair value of nonvested awards on equity-based plans excluding option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, revenue or profit achievement stock award plan) for which the employer is contingently obligated to issue equity instruments or transfer assets to an employee who has not yet satisfied service or performance criteria necessary to gain title to proceeds from the sale of the award or underlying shares or units. + 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 (c)(2)(i)-(ii) -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 b(2)(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 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 123R -Paragraph A240 -Subparagraph b(2)(a) -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. + Details
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- Definition The number of equity-based payment instruments, excluding stock (or unit) options, that vested during the reporting period. + 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 (c)(2)(iii)(2) -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 b(2)(d) -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. + Details
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- Definition The weighted average fair value as of grant date pertaining to an equity-based award plan other than a stock (or unit) option plan for which the grantee gained the right during the reporting period, by satisfying service and performance requirements, to receive or retain shares or units, other instruments, or cash in accordance with the terms of the arrangement. + 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 (c)(2)(iii)(2) -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 b(2)(d) -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. + Details
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- Definition Number of shares (or other type of equity) issued during the period as a result of any equity-based compensation plan other than an employee stock ownership plan (ESOP), net of any shares forfeited. Shares issued could result from the issuance of restricted stock, the exercise of stock options, stock issued under employee stock purchase plans, and/or other employee benefit plans. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.3-04) -URI http://asc.fasb.org/extlink&oid=6959260&loc=d3e187085-122770 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 129 -Paragraph 5 -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 AICPA -Name Accounting Principles Board Opinion (APB) -Number 12 -Paragraph 10 -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 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 29, 30 -Article 5 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Article 3 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21463-112644 + Details
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