Restructuring Charges - Schedule of Restructuring Related Activity (Details) $ in Millions	3 Months Ended	12 Months Ended
Dec. 31, 2018 USD ($)	Dec. 31, 2018 USD ($)
Restructuring Cost and Reserve [Line Items]
Charges Incurred	$ 19	$ 21
Payments		(5)
Reserve Balance as of December 31, 2018	16	16
Transportation
Restructuring Cost and Reserve [Line Items]
Charges Incurred		12
Payments		(3)
Reserve Balance as of December 31, 2018	9	9
Logistics
Restructuring Cost and Reserve [Line Items]
Charges Incurred		6
Payments		(1)
Reserve Balance as of December 31, 2018	5	5
Corporate
Restructuring Cost and Reserve [Line Items]
Charges Incurred		3
Payments		(1)
Reserve Balance as of December 31, 2018	$ 2	$ 2

Amount of cash payments made as the result of exit or disposal activities. Excludes payments associated with a discontinued operation or an asset retirement obligation.

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
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-Publisher FASB
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Amount of expenses associated with exit or disposal activities pursuant to an authorized plan. Excludes expenses related to a discontinued operation or an asset retirement obligation.

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Carrying amount (including both current and noncurrent portions of the accrual) as of the balance sheet date pertaining to a specified type of cost associated with exit from or disposal of business activities or restructuring pursuant to a duly authorized plan.

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