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Note 3 - Commitments, Contingencies, and Guarantees (Details Textual) $ in Millions | 1 Months Ended | 6 Months Ended |  |  |
--- | --- | --- | --- | --- | ---
Jun. 09, 2016 USD ($) | Jun. 30, 2016 USD ($) | Apr. 27, 2016 USD ($) | Dec. 31, 2015 USD ($) | Apr. 16, 2000
Pittsburgh Corning Corporation PCC [Member] | PPG Industries, Inc. [Member] |  |  |  |  |
Equity Method Investment, Ownership Percentage |  | 50.00% |  |  |
Pittsburgh Corning Corporation PCC [Member] | Asbestos Litigation [Member] |  |  |  |  |
Loss Contingency, Pending Claims, Number |  |  |  |  | 11,800
Pittsburgh Corning Corporation PCC [Member] |  |  |  |  |
Equity Method Investment, Ownership Percentage |  | 50.00% |  |  |
PCC and PCE [Member] |  |  |  |  |
Gain (Loss) on Investments | $ 56 |  |  |  |
Asbestos Litigation [Member] | Amended Pittsburgh Corning Corporation Plan [Member] | First Payment [Member] |  |  |  |  |
Loss Contingency Required Payments Per Reorganization Plan |  |  | $ 70 |  |
Asbestos Litigation [Member] | Amended Pittsburgh Corning Corporation Plan [Member] | First Subsequent Anniversary [Member] |  |  |  |  |
Loss Contingency Required Payments Per Reorganization Plan |  |  | 35 |  |
Asbestos Litigation [Member] | Amended Pittsburgh Corning Corporation Plan [Member] | Second Subsequent Anniversary [Member] |  |  |  |  |
Loss Contingency Required Payments Per Reorganization Plan |  |  | 50 |  |
Asbestos Litigation [Member] | Amended Pittsburgh Corning Corporation Plan [Member] | Third Subsequent Anniversary [Member] |  |  |  |  |
Loss Contingency Required Payments Per Reorganization Plan |  |  | 35 |  |
Asbestos Litigation [Member] | Amended Pittsburgh Corning Corporation Plan [Member] | Fourth Subsequent Anniversary [Member] |  |  |  |  |
Loss Contingency Required Payments Per Reorganization Plan |  |  | 50 |  |
Asbestos Litigation [Member] | Amended Pittsburgh Corning Corporation Plan [Member] | Fifth Subsequent Anniversary [Member] |  |  |  |  |
Loss Contingency Required Payments Per Reorganization Plan |  |  | 50 |  |
Asbestos Litigation [Member] | Amended Pittsburgh Corning Corporation Plan [Member] |  |  |  |  |
Loss Contingency Required Payments Per Reorganization Plan |  |  | $ 290 |  |
Asbestos Litigation [Member] | Amended PCC Plan and Non-PCC Asbestos Claims [Member] |  |  |  |  |
Loss Contingency Accrual, Period Increase (Decrease) |  | $ (238) |  |  |
Loss Contingency, Estimate of Possible Loss |  | 440 |  | $ 678 |
Asbestos Litigation [Member] | PCC Asbestos Claims [Member] |  |  |  |  |
Loss Contingency, Estimate of Possible Loss |  | 290 |  |  |
Loss Contingency, Accrual, Noncurrent |  | 220 |  |  |
Asbestos Litigation [Member] | Non-PCC Asbestos Litigation [Member] |  |  |  |  |
Loss Contingency, Estimate of Possible Loss |  | 150 |  |  |
Loss Contingency, Accrual, Noncurrent |  | 150 |  |  |
Loss Contingency, Accrual, Current |  | 70 |  |  |
Asbestos Litigation [Member] |  |  |  |  |
Loss Contingency, Accrual, Noncurrent |  | $ 370 |  |  |
Non-PCC Asbestos Litigation [Member] |  |  |  |  |
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 |  |  |
Contingent Guarantees [Member] |  |  |  |  |
Guarantor Obligations, Maximum Exposure, Undiscounted |  | $ 190 |  | 184 |
Environmental Cleanup and Related Litigation [Member] |  |  |  |  |
Accrual for Environmental Loss Contingencies |  | 47 |  | 37 |
Loss Contingency, Accrual, Noncurrent |  | 394 |  | 440 |
Loss Contingency, Accrual, Current |  | 76 |  | 238 |
Recorded Unconditional Purchase Obligation |  | $ 220 |  | $ 220 |
Number of Hazardous Waste Sites |  | 17 |  |  |

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