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Summary of Significant Accounting Policies - Property, Plant and Equipment (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Property, Plant and Equipment [Line Items]
Gross property, plant and equipment	$ 4,082	$ 4,019
Less: Accumulated depreciation	1,637	1,431
Total Property, plant and equipment, net	2,445	2,588
Land and improvements
Property, Plant and Equipment [Line Items]
Gross property, plant and equipment	43	47
Buildings
Property, Plant and Equipment [Line Items]
Gross property, plant and equipment	82	83
Machinery and equipment
Property, Plant and Equipment [Line Items]
Gross property, plant and equipment	3,754	3,734
Other
Property, Plant and Equipment [Line Items]
Gross property, plant and equipment	$ 203	$ 155
Minimum | Land improvements
Property, Plant and Equipment [Line Items]
Useful life	15 years
Minimum | Buildings
Property, Plant and Equipment [Line Items]
Useful life	20 years
Minimum | Machinery and equipment
Property, Plant and Equipment [Line Items]
Useful life	5 years
Minimum | Other
Property, Plant and Equipment [Line Items]
Useful life	5 years
Maximum | Land improvements
Property, Plant and Equipment [Line Items]
Useful life	30 years
Maximum | Buildings
Property, Plant and Equipment [Line Items]
Useful life	30 years
Maximum | Machinery and equipment
Property, Plant and Equipment [Line Items]
Useful life	30 years
Maximum | Other
Property, Plant and Equipment [Line Items]
Useful life	30 years
Petroleum Segment | Assets Held for Sale
Property, Plant and Equipment [Line Items]
Carrying value of assets held for sale	$ 33

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Amount of accumulated depreciation, depletion and amortization for physical assets used in the normal conduct of business to produce goods and services.

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