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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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