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Acquisitions Acquisition of Terminal Assets from and Joint Venture With BP (Details) $ in Millions |  | 6 Months Ended
--- | --- | ---
Feb. 01, 2016 USD ($) | Jun. 30, 2016 USD ($) | Jun. 30, 2015 USD ($)
Business Acquisition [Line Items] |  |  |
Contributions from noncontrolling interests |  | $ 87 | $ 0
BP Terminal Assets |  |  |
Business Acquisition [Line Items] |  |  |
Number of terminals | 15 |  |
Payments to Acquire Businesses, Gross | $ 349 | 349 |
New Joint Venture with BP [Member] | BP Terminal Assets |  |  |
Business Acquisition [Line Items] |  |  |
Jointly Owned Utility Plant, Proportionate Ownership Share | 75.00% |  |
Number of terminals contributed to equity investment | 14 |  |
BP [Member] | New Joint Venture with BP [Member] | BP Terminal Assets |  |  |
Business Acquisition [Line Items] |  |  |
Jointly Owned Utility Plant, Proportionate Ownership Share | 25.00% |  |
Contributions from noncontrolling interests |  | $ 84 |
Terminals | New Joint Venture with BP [Member] | BP Terminal Assets |  |  |
Business Acquisition [Line Items] |  |  |
Number of terminals contributed to equity investment | 10 |  |
Products Pipelines | New Joint Venture with BP [Member] | BP Terminal Assets |  |  |
Business Acquisition [Line Items] |  |  |
Number of terminals contributed to equity investment | 5 |  |

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- Definition The proportionate share of interest (percent) in a jointly owned utility plant. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 980 -SubTopic 360 -Section S99 -Paragraph 1 -Subparagraph (SAB Topic 10.C) -URI http://asc.fasb.org/extlink&oid=6500719&loc=d3e659983-123033 + Details
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