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Partners' Capital and Distributions - Sale of Units (Details) - USD ($) $ in Millions | 1 Months Ended | 9 Months Ended
--- | --- | ---
Mar. 31, 2017 | Sep. 30, 2017 | Sep. 30, 2016
Subsidiary, Sale of Stock [Line Items] |  |  |
Sale of common units, net proceeds |  | $ 1,664 | $ 289
Common Units |  |  |
Subsidiary, Sale of Stock [Line Items] |  |  |
Sale of common units (units) |  | 54,119,893 |
Sale of common units, net proceeds |  | $ 1,664 |
Common Units | Continuous Offering Program |  |  |
Subsidiary, Sale of Stock [Line Items] |  |  |
Sale of common units (units) |  | 4,033,567 |
Sale of common units, net proceeds |  | $ 129 |
Commissions paid to sales agents |  | $ 1 |
Common Units | Omnibus Agreement |  |  |
Subsidiary, Sale of Stock [Line Items] |  |  |
Sale of common units (units) |  | 50,086,326 |
Sale of common units, net proceeds |  | $ 1,535 |
Omnibus Agreement | Common Units | AAP | Continuous Offering Program |  |  |
Subsidiary, Sale of Stock [Line Items] |  |  |
Sale of common units (units) |  | 1,800,000 |
Omnibus Agreement | Common Units | AAP | Underwritten Offering |  |  |
Subsidiary, Sale of Stock [Line Items] |  |  |
Sale of common units (units) | 48,300,000 |  |

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- Definition Total change in each class of partners' capital accounts during the year due to the sale of units. All partners include 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 1 -Subparagraph (SX 210.3-04) -URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187085-122770 Reference 2: 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 + Details
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- Definition Total units issued during the year due to the sale of units. All partners include 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 1 -Subparagraph (SX 210.3-04) -URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187085-122770 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 272 -SubTopic 10 -Section 50 -Paragraph 3 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6373374&loc=d3e70478-108055 + Details
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- Definition The cash outflow for cost incurred directly with the issuance of an equity security. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 15 -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3291-108585 + Details
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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