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Acquisitions and Divestitures Terminals Asset Sale (Details) $ in Millions | 1 Months Ended | 3 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | --- | ---
Oct. 31, 2016 USD ($) | Dec. 31, 2016 USD ($) Terminals | Dec. 31, 2016 USD ($) | Dec. 31, 2017 USD ($) | Jun. 30, 2017 Terminals
Long Lived Assets Held-for-sale [Line Items] |  |  |  |  |
Assets held for sale |  | $ 78 | $ 78 | $ 0 |
Terminal Asset Sale [Member] |  |  |  |  |
Long Lived Assets Held-for-sale [Line Items] |  |  |  |  |
Proceeds from Sale of Property, Plant, and Equipment | $ 100 |  |  |  |
Gain (loss) on impairments and divestitures, net |  |  | (81) |  |
Goodwill, Period Increase (Decrease) |  |  | (7) |  |
Disposal Group, Disposed of by Sale, Not Discontinued Operations [Member] | Terminal Asset Sale [Member] |  |  |  |  |
Long Lived Assets Held-for-sale [Line Items] |  |  |  |  |
Proceeds from Sale of Property, Plant, and Equipment |  | $ 37 |  |  |
Number of Terminals Sales Transaction Closed | Terminals |  | 8 |  |  |
Disposal Group, Held-for-sale, Not Discontinued Operations [Member] | Terminal Asset Sale [Member] |  |  |  |  |
Long Lived Assets Held-for-sale [Line Items] |  |  |  |  |
Number of terminals | Terminals |  |  |  |  | 11
Assets held for sale |  | $ 61 | $ 61 |  |

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