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Related Party Transactions - Expenses Incurred and Payments Made to Related Parties (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Related Party Transaction [Line Items]
Cost of materials and other	$ 1,561	$ 1,133	$ 4,370	$ 3,582
ARI Leasing, LLC | Railcar Lease Agreements and Maintenance
Related Party Transaction [Line Items]
Cost of materials and other	0	0	1	1
Insight Portfolio Group
Related Party Transaction [Line Items]
Payments made	0	0	0	0
American Entertainment Properties Corporation | Tax Allocation Agreement
Related Party Transaction [Line Items]
Payments made	$ 5	$ 0	$ 13	$ 10

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