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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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Amount of gain (loss) from the difference between the sale price or salvage price and the book value of an asset that was sold or retired, and gain (loss) from the write down of assets from their carrying value to fair value.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 28
-Subparagraph (b)
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Amount of increase (decrease) of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

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-Name Accounting Standards Codification
-Topic 350
-SubTopic 20
-Section 50
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