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Investments (Narrative) (Details) - USD ($) $ in Millions |  | 12 Months Ended |  |
--- | --- | --- | --- | ---
May 31, 2016 | Dec. 31, 2016 | Dec. 31, 2018 | Dec. 31, 2017
Removal of Carrying Value of Equity Method Investment |  |  | $ (383) |  |
Release of Deferred Tax Liabilities |  |  | 105 |  |
Realignment of Equity Investment, Gain (Loss) |  |  | $ 2,676 |  |
Investment assets |  |  |  | $ 376 | $ 340
Dow Corning Corporation [Member] |  |  |  |  |
Equity Method Investment, Ownership Percentage |  | 50.00% |  |  |
Subsidiary or Equity Method Investee, Cumulative Percentage Ownership after All Transactions |  | 100.00% |  |  |
Equity Method Investments |  | $ 4,800 |  |  |
Pittsburgh Corning Corporation PCC [Member] |  |  |  |  |
Equity Method Investment, Ownership Percentage |  |  |  | 50.00% |
HSG [Member] |  |  |  |  |
Equity Method Investment, Ownership Percentage | [1],[2] |  |  | 50.00% |
Investment assets |  |  |  | $ 42 |
HSG [Member] |  |  |  |  |
Removal of Carrying Value of Equity Method Investment |  | $ 383 |  |  |
[1] | Amount reflects Corning's direct ownership interests in the affiliated companies at December 31, 2018 and December 31, 2017. Corning does not control any of such entities.
[2] | HSG indirectly holds an 80.5% interest in a HSG operating partnership. At December 31, 2018, the carrying value of the investment in HSG was $42 million and recorded in Investments. At December 31, 2017, the negative carrying value of the investment in HSG was $105 million and recorded in Other Liabilities.

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