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Note 15 - Shareholders' Equity (Details Textual) - USD ($) |  |  | 3 Months Ended | 6 Months Ended |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | ---
Jan. 22, 2016 | Jan. 15, 2014 | Jun. 30, 2016 | Jun. 30, 2015 | Jun. 30, 2016 | Jun. 30, 2015 | Dec. 31, 2015 | Oct. 28, 2015 | Oct. 26, 2015 | Jul. 15, 2015
Convertible Preferred Stock, Series A [Member] | Samsung Corning Precision Materials Co., Ltd. [Member] |  |  |  |  |  |  |  |  |  |
Stock Issued During Period, Shares, Acquisitions |  | 2,300 |  |  |  |  |  |  |  |
Share Price |  | $ 1,000,000 |  |  |  |  |  |  |  |
Stock Issued During Period, Value, Acquisitions |  | $ 2,300,000,000 |  |  |  |  |  |  |  |
Convertible Preferred Stock, Series A [Member] |  |  |  |  |  |  |  |  |  |
Preferred Stock, Par or Stated Value Per Share |  | $ 100 |  |  |  |  |  |  |  |
Common Stock [Member] |  |  |  |  |  |  |  |  |  |
Convertible Preferred Stock, Shares Issued upon Conversion |  | 50,000 |  |  |  |  |  |  |  |
Accumulated Defined Benefit Plans Adjustment Attributable to Parent [Member] |  |  |  |  |  |  |  |  |  |
Other Comprehensive Income (Loss), Equity Method Investments, Tax |  |  | $ 19,000,000 | $ 0 | $ 19,000,000 | $ 0 |  |  |  |
July 15, 2015 [Member] |  |  |  |  |  |  |  |  |  |
Stock Repurchase Program, Authorized Amount |  |  |  |  |  |  |  |  |  | $ 2,000,000,000
Oct. 26, 2015 [Member] |  |  |  |  |  |  |  |  |  |
Stock Repurchase Program, Authorized Amount |  |  |  |  |  |  |  |  | $ 4,000,000,000 |
Oct. 28, 2015 [Member] | Morgan Stanley [Member] |  |  |  |  |  |  |  |  |  |
Stock Repurchase Program, Authorized Amount |  |  |  |  |  |  |  | $ 1,250,000,000 |  |
Treasury Stock, Shares, Acquired | 15,900,000 |  |  |  |  |  |  |  |  |
The 2015 Repurchase Program [Member] |  |  |  |  |  |  |  |  |  |
Treasury Stock, Shares, Acquired |  |  | 40,900,000 |  | 80,700,000 |  |  |  |  |
Treasury Stock, Value, Acquired, Cost Method |  |  | $ 810,000,000 |  | $ 1,561,000,000 |  |  |  |  |
Gain on Realignment of Equity Investment [Member] |  |  |  |  |  |  |  |  |  |
Foreign Currency Transaction Gain, before Tax |  |  | 45,000,000 |  |  |  |  |  |  |
Cumulative Unamortized Actuarial Loss Released During Period, Net of Tax |  |  | 260,000,000 |  |  |  |  |  |  |
Cumulative Unamortized Actuarial Loss Released During Period, Tax |  |  | 19,000,000 |  |  |  |  |  |  |
Selling, General and Administrative Expenses [Member] |  |  |  |  |  |  |  |  |  |
Foreign Currency Transaction Loss, before Tax |  |  | 22,000,000 |  |  |  |  |  |  |
Cumulative Unamortized Actuarial Loss Released During Period, Net of Tax |  |  | $ 2,000,000 |  |  |  |  |  |  |
Preferred Stock, Par or Stated Value Per Share |  |  | $ 100 |  | $ 100 |  | $ 100 |  |  |

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