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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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- Definition

The gain (loss) associated with the realignment of an equity method investment.

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- Definition

The carrying amount of equity method investment removed from the calculation of investment gains.

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- Definition

The percentage of ownership of common stock or equity participation in the investee accounted for under the equity method of accounting.

+ References

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Amount of investment in equity method investee and investment in and advance to affiliate.

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Percentage of subsidiary's or equity method investee's stock owned by parent immediately after all stock transactions.

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