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Partners' Capital and Distributions - Schedule of Distributions (Details) - USD ($) $ / shares in Units, $ in Millions | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Distribution Made to Limited Partner [Line Items] |  |  |
Total distributions paid | $ 1,399 | $ 1,631 | $ 1,674
Cash Distribution |  |  |
Distribution Made to Limited Partner [Line Items] |  |  |
Total distributions paid |  | $ 1,627 | $ 1,671
Common Units | Cash Distribution |  |  |
Distribution Made to Limited Partner [Line Items] |  |  |
Total distributions paid | $ 1,386 |  |
Distributions per common unit (in dollars per unit) | $ 1.95 | $ 2.65 | $ 2.76
Public | Common Units | Cash Distribution |  |  |
Distribution Made to Limited Partner [Line Items] |  |  |
Distributions paid to limited partners | $ 849 | $ 1,062 | $ 1,081
AAP | Cash Distribution |  |  |
Distribution Made to Limited Partner [Line Items] |  |  |
Distributions paid to General Partner |  | $ 565 | $ 590
AAP | Common Units | Cash Distribution |  |  |
Distribution Made to Limited Partner [Line Items] |  |  |
Distributions paid to limited partners | $ 537 |  |

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- Definition The total amount of distributions to the general partner during the period. + 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=27012166&loc=d3e187085-122770 + Details
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- Definition Total distributions to each class of partners (i.e., general, limited and preferred partners). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section S99 -Paragraph 5 -Subparagraph (SAB Topic 4.F) -URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187171-122770 Reference 2: 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=27012166&loc=d3e187085-122770 + Details
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