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Investments (Investments) (Details) - USD ($) $ in Millions | Dec. 31, 2018 | Dec. 31, 2017 | May 31, 2016
--- | --- | --- | ---
Other investments |  | $ 22 | $ 60 |
Investment assets |  | 376 | 340 |
Investment liabilities |  |  | 105 |
Dow Corning Corporation [Member] |  |  |  |
Ownership interest |  |  |  | 50.00%
Investment in affiliated companies, at equity |  |  |  | $ 4,800
All Other [Member] |  |  |  |
Investment in affiliated companies, at equity | [1] | $ 354 | 280 |
HSG [Member] |  |  |  |
Ownership interest | [1],[2] | 50.00% |  |
Investment assets |  | $ 42 |  |
Investment liabilities | [1],[2] |  | $ 105 |
HSG [Member] | HSG Operating Partnership [Member] |  |  |  |
Ownership interest |  | 80.50% |  |
Minimum [Member] |  |  |  |
Ownership interest |  | 20.00% |  |
Maximum [Member] |  |  |  |
Ownership interest |  | 50.00% |  |
[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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