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Acquisitions and Divestitures (1) BP Products North America Inc. (BP) Terminal Assets (Details) $ in Millions |  | 12 Months Ended
--- | --- | ---
Feb. 01, 2016 USD ($) Terminals | Dec. 31, 2017 USD ($) | Dec. 31, 2016 USD ($) Terminals | Dec. 31, 2015 USD ($)
Business Acquisition [Line Items] |  |  |  |
Proceeds from noncontrolling interests | $ |  | $ 12 | $ 117 | $ 11
BP Terminal Assets [Member] |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Number of terminals | 15 |  |  |
Payments to Acquire Businesses, Gross | $ | $ 349 |  |  |
Number of terminals wholly owned | 1 |  |  |
New Joint Venture with BP [Member] | BP Terminal Assets [Member] |  |  |  |
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 [Member] |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Jointly Owned Utility Plant, Proportionate Ownership Share | 25.00% |  |  |
Proceeds from noncontrolling interests | $ |  |  | $ 84 |
Terminals |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Number of terminals |  |  | 20 |
Terminals | New Joint Venture with BP [Member] | BP Terminal Assets [Member] |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Number of terminals | 10 |  |  |
Products Pipelines | New Joint Venture with BP [Member] | BP Terminal Assets [Member] |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Number of terminals | 5 |  |  |

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