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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.