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Note 2 - Commitments, Contingencies, and Guarantees (Details) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2015 USD ($)	Jun. 30, 2014 USD ($)	Jun. 30, 2015 USD ($)	Jun. 30, 2014 USD ($)	Dec. 31, 2014 USD ($)	Nov. 12, 2013 USD ($)	Apr. 16, 2000 USD ($)
Note 2 - Commitments, Contingencies, and Guarantees (Details) [Line Items]
Recorded Unconditional Purchase Obligation	$ 311		$ 311		$ 287
Number of Hazardous Waste Sites	15		15
Contingent Guarantees [Member]
Note 2 - Commitments, Contingencies, and Guarantees (Details) [Line Items]
Guarantor Obligations, Maximum Exposure, Undiscounted	$ 174		$ 174		150
Pittsburgh Corning Corporation (PCC) [Member]
Note 2 - Commitments, Contingencies, and Guarantees (Details) [Line Items]
Equity Method Investment, Ownership Percentage	50.00%		50.00%
Equity Method Investments							$ 0
Pittsburgh Corning Europe (PCE) [Member]
Note 2 - Commitments, Contingencies, and Guarantees (Details) [Line Items]
Equity Method Investments, Fair Value Disclosure	$ 245		$ 245		241
Equity Method Investments	151		151		162
Environmental Cleanup And Related Litigation [Member]
Note 2 - Commitments, Contingencies, and Guarantees (Details) [Line Items]
Accrual for Environmental Loss Contingencies	$ 41		$ 41		43
PPG Industries, Inc. [Member] | Pittsburgh Corning Corporation (PCC) [Member]
Note 2 - Commitments, Contingencies, and Guarantees (Details) [Line Items]
Equity Method Investment, Ownership Percentage	50.00%		50.00%
Asbestos Litigation [Member]
Note 2 - Commitments, Contingencies, and Guarantees (Details) [Line Items]
Asbestos Settlement (Credit) Charge	$ 2	$ 4	$ 3	$ 6
Asbestos Litigation [Member] | Amended Pittsburgh Corning Corporation Plan [Member]
Note 2 - Commitments, Contingencies, and Guarantees (Details) [Line Items]
Loss Contingency, Required Payments Per Reorganization Plan						$ 290
Asbestos Litigation [Member] | First Payment [Member] | Amended Pittsburgh Corning Corporation Plan [Member]
Note 2 - Commitments, Contingencies, and Guarantees (Details) [Line Items]
Loss Contingency, Required Payments Per Reorganization Plan						70
Asbestos Litigation [Member] | First Subsequent Anniversary [Member] | Amended Pittsburgh Corning Corporation Plan [Member]
Note 2 - Commitments, Contingencies, and Guarantees (Details) [Line Items]
Loss Contingency, Required Payments Per Reorganization Plan						35
Asbestos Litigation [Member] | Second Subsequent Anniversary [Member] | Amended Pittsburgh Corning Corporation Plan [Member]
Note 2 - Commitments, Contingencies, and Guarantees (Details) [Line Items]
Loss Contingency, Required Payments Per Reorganization Plan						50
Asbestos Litigation [Member] | Third Subsequent Anniversary [Member] | Amended Pittsburgh Corning Corporation Plan [Member]
Note 2 - Commitments, Contingencies, and Guarantees (Details) [Line Items]
Loss Contingency, Required Payments Per Reorganization Plan						35
Asbestos Litigation [Member] | Fourth Subsequent Anniversary [Member] | Amended Pittsburgh Corning Corporation Plan [Member]
Note 2 - Commitments, Contingencies, and Guarantees (Details) [Line Items]
Loss Contingency, Required Payments Per Reorganization Plan						50
Asbestos Litigation [Member] | Fifth Subsequent Anniversary [Member] | Amended Pittsburgh Corning Corporation Plan [Member]
Note 2 - Commitments, Contingencies, and Guarantees (Details) [Line Items]
Loss Contingency, Required Payments Per Reorganization Plan						$ 50
Asbestos Litigation [Member] | Pittsburgh Corning Corporation (PCC) [Member]
Note 2 - Commitments, Contingencies, and Guarantees (Details) [Line Items]
Loss Contingency, Pending Claims, Number							11,800
Non-PCC Asbestos Litigation [Member]
Note 2 - Commitments, Contingencies, and Guarantees (Details) [Line Items]
Number of Other Cases Currently Involved Alleging Injuries from Asbestos and Similar Amounts of Monetary Damages Per Case			9,700
Number of Claims in Other Cases Currently Involved Alleging Injuries from Asbestos and Similar Amounts of Monetary Damages Per Case			37,300
Insurance Recoveries			$ 19
Loss Contingency Accrual, Period Increase (Decrease)			$ 150
Undiscounted Projection of Claims and Related Legal Fees, Period			20 years
Amended PCC Plan and Non-PCC Asbestos Claims [Member]
Note 2 - Commitments, Contingencies, and Guarantees (Details) [Line Items]
Loss Contingency, Estimate of Possible Loss	$ 685		$ 685		$ 681

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