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Debt (Details) (USD $) In Millions, unless otherwise specified |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 9 Months Ended |  |  |  |  |
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Sep. 30, 2014 | Dec. 31, 2013 | Sep. 30, 2014 5.25% senior notes due June 2015 | Dec. 31, 2013 5.25% senior notes due June 2015 | Sep. 30, 2014 3.95% senior notes due September 2015 | Dec. 31, 2013 3.95% senior notes due September 2015 | Sep. 30, 2014 5.88% senior notes due August 2016 | Dec. 31, 2013 5.88% senior notes due August 2016 | Sep. 30, 2014 6.13% senior notes due January 2017 | Dec. 31, 2013 6.13% senior notes due January 2017 | Sep. 30, 2014 6.50% senior notes due May 2018 | Dec. 31, 2013 6.50% senior notes due May 2018 | Sep. 30, 2014 8.75% senior notes due May 2019 | Dec. 31, 2013 8.75% senior notes due May 2019 | Sep. 30, 2014 5.75% senior notes due January 2020 | Dec. 31, 2013 5.75% senior notes due January 2020 | Sep. 30, 2014 5.00% senior notes due February 2021 | Dec. 31, 2013 5.00% senior notes due February 2021 | Sep. 30, 2014 3.65% senior notes due June 2022 | Dec. 31, 2013 3.65% senior notes due June 2022 | Sep. 30, 2014 2.85% senior notes due January 2023 | Dec. 31, 2013 2.85% senior notes due January 2023 | Sep. 30, 2014 3.85% senior notes due October 2023 | Dec. 31, 2013 3.85% senior notes due October 2023 | Sep. 30, 2014 3.60% senior notes due November 2024 | Sep. 30, 2014 6.70% senior notes due May 2036 | Dec. 31, 2013 6.70% senior notes due May 2036 | Sep. 30, 2014 6.65% senior notes due January 2037 | Dec. 31, 2013 6.65% senior notes due January 2037 | Sep. 30, 2014 5.15% senior notes due June 2042 | Dec. 31, 2013 5.15% senior notes due June 2042 | Sep. 30, 2014 4.30% senior notes due January 2043 | Dec. 31, 2013 4.30% senior notes due January 2043 | Sep. 30, 2014 4.70% senior notes due June 2044 | Apr. 23, 2014 4.70% senior notes due June 2044 | Sep. 30, 2014 PAA commercial paper notes | Dec. 31, 2013 PAA commercial paper notes | Sep. 30, 2014 AAP term loan | Dec. 31, 2013 AAP term loan | Sep. 30, 2014 AAP senior secured revolving credit facility | Dec. 31, 2013 AAP senior secured revolving credit facility
Short-term debt: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
PAA commercial paper notes, bearing a weighted-average interest rate of 0.30% and 0.33%, respectively |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 423 | $ 1,109 |  |  |  |
Senior notes, current |  |  | 150 |  | 400 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Other short-term debt | 3 | 4 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total short-term debt | 976 | 1,113 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Repayment period |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1 year |  |  |  |  |
Weighted average interest rate, short-term (as a percent) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0.30% | 0.33% |  |  |  |
Long-term debt: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Unamortized discounts | (16) | (15) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
PAA senior notes, net of unamortized discounts | 7,609 | 6,710 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
PAA senior notes, noncurrent |  |  |  | 150 |  | 400 | 175 | 175 | 400 | 400 | 600 | 600 | 350 | 350 | 500 | 500 | 600 | 600 | 750 | 750 | 400 | 400 | 700 | 700 | 750 | 250 | 250 | 600 | 600 | 500 | 500 | 350 | 350 | 700 |  |  |  |  |  |  |
AAP term loan, bearing a weighted-average interest rate of 1.8% and 1.9%, respectively |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 500 | 500 |  |
AAP senior secured revolving credit facility, bearing a weighted-average interest rate of 1.7% and 2.2%, respectively |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 31 | 15
Long-term debt, other | 4 | 5 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total long-term debt | 8,144 | 7,230 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Weighted average interest rate, long-term (as a percent) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1.80% | 1.90% | 1.70% | 2.20%
Total debt | $ 9,120 | $ 8,343 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument, interest rate (as a percent) |  |  | 5.25% | 5.25% | 3.95% | 3.95% | 5.88% | 5.88% | 6.13% | 6.13% | 6.50% | 6.50% | 8.75% | 8.75% | 5.75% | 5.75% | 5.00% | 5.00% | 3.65% | 3.65% | 2.85% | 2.85% | 3.85% | 3.85% | 3.60% | 6.70% | 6.70% | 6.65% | 6.65% | 5.15% | 5.15% | 4.30% | 4.30% | 4.70% | 4.70% |  |  |  |  |  |

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- Definition Amount of long-term debt before deduction of unamortized discount or premium. Includes, but is not limited to, notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt, with initial maturities beyond one year or the normal operating cycle, if longer. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 20 -Article 5 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 22 -Article 5 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 16 -Article 9 + Details
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- Definition The carrying value as of the balance sheet date of the noncurrent portion of long-term obligations drawn from a line of credit, which is a bank's commitment to make loans up to a specific amount. Examples of items that might be included in the application of this element may consist of letters of credit, standby letters of credit, and revolving credit arrangements, under which borrowings can be made up to a maximum amount as of any point in time conditional on satisfaction of specified terms before, as of and after the date of drawdowns on the line. Includes short-term obligations that would normally be classified as current liabilities but for which (a) postbalance sheet date issuance of a long term obligation to refinance the short term obligation on a long term basis, or (b) the enterprise has entered into a financing agreement that clearly permits the enterprise to refinance the short-term obligation on a long term basis and the following conditions are met (1) the agreement does not expire within 1 year and is not cancelable by the lender except for violation of an objectively determinable provision, (2) no violation exists at the BS date, and (3) the lender has entered into the financing agreement is expected to be financially capable of honoring the agreement. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 22 -Article 5 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Line-of-Credit Arrangement -URI http://asc.fasb.org/extlink&oid=6517033 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 10 -Section 45 -Paragraph 13 -URI http://asc.fasb.org/extlink&oid=28361426&loc=d3e1314-112600 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 10 -Section 45 -Paragraph 14 -URI http://asc.fasb.org/extlink&oid=28361426&loc=d3e1336-112600 + Details
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- Definition Carrying value as of the balance sheet date, including the current and noncurrent portions, of collateralized debt obligations (with maturities initially due after one year or beyond the operating cycle, if longer). Such obligations include mortgage loans, chattel loans, and any other borrowings secured by assets of the borrower. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.16) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 16 -Article 9 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 19, 20, 22 -Article 5 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03.16) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 + Details
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