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Reportable Segments (Reconciliation of Reportable Segment Assets to Consolidated Total Assets) (Details) - USD ($) $ in Millions | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
--- | --- | --- | ---
Segment Reporting, Asset Reconciling Item [Line Items] |  |  |  |  |
Current assets |  | $ 7,034 | $ 8,827 |  |
Investment assets |  | 376 | 340 |  |
Property, plant and equipment, net |  | 14,895 | 14,017 |  |
Other non-current assets |  | 1,021 | 934 |  |
Total assets |  | 27,505 | 27,494 |  | $ 27,899
Investment in Hemlock Semiconductor Group |  |  | 105 | [1] | 241
Operating Segments [Member] | Reportable Segments [Member] |  |  |  |  |
Segment Reporting, Asset Reconciling Item [Line Items] |  |  |  |  |
Total assets |  | 16,230 | 15,356 |  | 13,417
Operating Segments [Member] | Non Reportable Segments [Member] |  |  |  |  |
Segment Reporting, Asset Reconciling Item [Line Items] |  |  |  |  |
Total assets |  | 1,018 | 824 |  | 750
Segment Reconciling Items [Member] |  |  |  |  |
Segment Reporting, Asset Reconciling Item [Line Items] |  |  |  |  |
Current assets | [2] | 3,065 | 5,315 |  | 6,070
Investment assets | [3] | 64 | 61 |  | 12
Property, plant and equipment, net | [4] | 1,928 | 1,628 |  | 1,681
Other non-current assets | [5] | $ 5,200 | $ 4,310 |  | $ 5,969
[1] | The negative carrying value resulted from a one-time charge to this entity in 2014 for the permanent abandonment of certain assets. Refer to Note 5 (Investments) to the Consolidated Financial Statements for additional information.
[2] | Includes current corporate assets, primarily cash, short-term investments, current portion of long-term derivative assets and deferred taxes.
[3] | Primarily represents corporate equity and cost basis investments. Asset balance does not include equity method affiliate liability balance of $105 and $241 for HSG in 2017 and 2016, respectively.
[4] | Represents corporate property not specifically identifiable to an operating segment.
[5] | Includes non-current corporate assets, pension assets, long-term derivative assets and deferred taxes.

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