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Divestitures and Acquisition Terminals Asset Sale (Details) $ in Millions | 3 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | ---
Dec. 31, 2016 USD ($) | Dec. 31, 2018 USD ($) | Dec. 31, 2017 USD ($) | Dec. 31, 2016 USD ($) | Jun. 30, 2017 | Oct. 31, 2016 USD ($)
Long Lived Assets Held-for-sale [Line Items] |  |  |  |  |  |
Loss on impairments and divestitures, net |  | $ 167 | $ 13 | $ 387 |  |
Terminal Asset Sale [Member] |  |  |  |  |  |
Long Lived Assets Held-for-sale [Line Items] |  |  |  |  |  |
Consideration on transaction |  |  |  |  |  | $ 100
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] |  |  |  |  |  |
Number of terminals | 8 |  |  | 8 |  |
Proceeds from sale of assets | $ 37 |  |  |  |  |
Disposal Group, Held-for-sale, Not Discontinued Operations [Member] | Terminal Asset Sale [Member] |  |  |  |  |  |
Long Lived Assets Held-for-sale [Line Items] |  |  |  |  |  |
Number of terminals |  |  |  |  | 11 |

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