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Note 9 - Investments - Gain of Realignment (Details) - USD ($) $ in Millions |  | 3 Months Ended | 6 Months Ended
--- | --- | --- | ---
May 31, 2016 | Jun. 30, 2016 | Jun. 30, 2015 | Jun. 30, 2016 | Jun. 30, 2015
Cash |  |  |  | $ 4,818 |
Carrying Value of Dow Corning Equity Investment |  |  |  | (1,560) |
Carrying Value of HSG Equity Investment | $ (383) |  |  | (383) |
Other (1) |  |  |  | (199) |
Gain |  | $ 2,676 |  | $ 2,676 |

X
- Definition The amount of cash received due to the realignment of an equity method investment. + References No definition available. + Details
Name: | glw_RealignmentOfEquityInvestmentCashReceived
Namespace Prefix: | glw_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition The gain (loss) associated with the realignment of an equity method investment. + References No definition available. + Details
Name: | glw_RealignmentOfEquityInvestmentGainLoss
Namespace Prefix: | glw_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition The amount of deferred tax and AOCI on equity method investments that has been removed for evaluation. + References No definition available. + Details
Name: | glw_RemovalDeferredTaxAndAOCIOnEquityMethodInvestments
Namespace Prefix: | glw_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition The carrying amount of equity method investment removed from the calculation of investment gains. + References No definition available. + Details
Name: | glw_RemovalOfCarryingValueOfEquityMethodInvestment
Namespace Prefix: | glw_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition The amount of equity method investment that has been removed and is no longer owned. + References No definition available. + Details
Name: | glw_RemovalOfEquityInvestment
Namespace Prefix: | glw_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration