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Note 17 - Shareholders' Equity (Details) - USD ($) $ / shares in Units, $ in Millions |  |  |  |  | 1 Months Ended | 3 Months Ended | 4 Months Ended | 10 Months Ended | 11 Months Ended | 12 Months Ended |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Jan. 22, 2016 | Oct. 29, 2015 | Mar. 04, 2014 | Jan. 15, 2014 | Jan. 15, 2014 | May. 28, 2014 | Jan. 31, 2014 | Oct. 31, 2013 | Jan. 22, 2016 | May. 28, 2014 | Mar. 31, 2014 | Jan. 31, 2014 | Dec. 31, 2014 | Mar. 31, 2014 | Dec. 31, 2015 | Dec. 31, 2014 | Mar. 31, 2014 | Dec. 31, 2013 | Oct. 28, 2015 | Oct. 26, 2015 | Jul. 15, 2015 | Dec. 03, 2014 | Oct. 22, 2013
Note 17 - Shareholders' Equity (Details) [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Preferred Stock, Par or Stated Value Per Share (in Dollars per share) |  |  |  |  |  |  |  |  |  |  |  |  | $ 100 |  | $ 100 | $ 100 |  |  |  |  |  |  |
Stock Issued During Period, Value, Acquisitions |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 1,915 |  |  |  |  |  |  |
Stock Issued During Period, Value, New Issues |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 400 |  |  |  |  |  |  |
Minimum Closing Price of Common Stock for the Company to Exercise Option to Convert Preferred Stock (in Dollars per share) |  |  |  | $ 35 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Treasury Stock, Shares, Acquired (in Shares) |  |  |  |  |  |  |  |  |  |  |  |  | 98,200,000 | 118,900,000 | 151,000,000 |  |  |  |  |  |  |  |
Treasury Stock, Value, Acquired, Cost Method |  |  |  |  |  |  |  |  |  |  |  |  | $ 2,000 | $ 2,000 | $ 3,228 | 2,483 |  | $ 1,516 |  |  |  |  |
Other Comprehensive Income (Loss), Tax |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (41) | (96) |  | 197 |  |  |  |  |
Hedges [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Note 17 - Shareholders' Equity (Details) [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Other Comprehensive Income (Loss), Tax |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (35) | 7 |  | 33 |  |  |  |  |
Postretirement Benefits [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Note 17 - Shareholders' Equity (Details) [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Other Comprehensive Income (Loss), Tax |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ (6) | (104) |  | $ 164 |  |  |  |  |
Investment Gains [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Note 17 - Shareholders' Equity (Details) [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Other Comprehensive Income (Loss), Tax |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 1 |  |  |  |  |  |  |
Oct. 22, 2013 [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Note 17 - Shareholders' Equity (Details) [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stock Repurchase Program, Authorized Amount |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 2,000
Dec. 3, 2014 [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Note 17 - Shareholders' Equity (Details) [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stock Repurchase Program, Authorized Amount |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 1,500 |
Treasury Stock, Shares, Acquired (in Shares) |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 70,400,000 |  |  |  |  |  |  |  |
Treasury Stock, Value, Acquired, Cost Method |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 1,500 |  |  |  |  |  |  |  |
July 15, 2015 [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Note 17 - Shareholders' Equity (Details) [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stock Repurchase Program, Authorized Amount |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 2,000 |  |
Oct. 26, 2015 [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Note 17 - Shareholders' Equity (Details) [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stock Repurchase Program, Authorized Amount |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 4,000 |  |  |
Dec. 3, 2014 & July 15, 2015 [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Note 17 - Shareholders' Equity (Details) [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Treasury Stock, Shares, Acquired (in Shares) |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 98,000,000 |  |  |  |  |  |  |  |
Treasury Stock, Value, Acquired, Cost Method |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 2,000 |  |  |  |  |  |  |  |
Convertible Preferred Stock, Series A [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Note 17 - Shareholders' Equity (Details) [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Preferred Stock, Par or Stated Value Per Share (in Dollars per share) |  |  |  | $ 100 | $ 100 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Preferred Stock, Dividend Rate, Percentage |  |  |  | 4.25% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Convertible Preferred Stock, Threshold Trading Days |  |  |  | 25 days |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Convertible Preferred Stock, Threshold Consecutive Trading Days |  |  |  | 40 days |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Samsung Corning Precision Materials Co., Ltd. [Member] | Convertible Preferred Stock, Series A [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Note 17 - Shareholders' Equity (Details) [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Preferred Stock, Par or Stated Value Per Share (in Dollars per share) |  |  |  | $ 100 | $ 100 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stock Issued During Period, Shares, Acquisitions (in Shares) |  |  |  | 1,900 | 2,300 |  |  |  |  |  | 1,900 |  |  |  |  |  |  |  |  |  |  |  |
Share Price (in Dollars per share) |  |  |  | $ 1,000,000 | $ 1,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stock Issued During Period, Value, Acquisitions |  |  |  | $ 1,900 | $ 2,300 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Samsung Corning Precision Materials Co., Ltd. [Member] | Additional Amount Issued at Closing [Member] | Convertible Preferred Stock, Series A [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Note 17 - Shareholders' Equity (Details) [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stock Issued During Period, Value, New Issues |  |  |  | $ 400 |  |  |  |  |  |  | $ 400 |  |  |  |  |  |  |  |  |  |  |  |
JP Morgan Chase [Member] | April 24, 2013 [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Note 17 - Shareholders' Equity (Details) [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stock Repurchase Program, Authorized Amount |  |  |  |  |  |  |  | $ 1,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Treasury Stock, Shares, Acquired (in Shares) |  |  |  |  |  |  | 10,500,000 | 47,100,000 |  |  |  | 57,600,000 |  |  |  |  |  |  |  |  |  |  |
Accelerated Share Repurchases, Settlement (Payment) or Receipt |  |  |  |  |  |  |  | $ (1,000) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Treasury Stock, Value, Acquired, Cost Method |  |  |  |  |  |  |  | 800 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Adjustments to Additional Paid in Capital, Other |  |  |  |  |  |  |  | $ (200) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Open Market [Member] | April 24, 2013 [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Note 17 - Shareholders' Equity (Details) [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Treasury Stock, Shares, Acquired (in Shares) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 61,300,000 |  |  |  |  |  |
Treasury Stock, Value, Acquired, Cost Method |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 1,000 |  |  |  |  |  |
Open Market [Member] | Jan 15, 2014 [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Note 17 - Shareholders' Equity (Details) [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Treasury Stock, Shares, Acquired (in Shares) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 36,900,000 |  |  |  |  |  |  |
Treasury Stock, Value, Acquired, Cost Method |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 750 |  |  |  |  |  |  |
Citibank [Member] | March 4, 2014 [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Note 17 - Shareholders' Equity (Details) [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stock Repurchase Program, Authorized Amount |  |  | $ 1,250 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Treasury Stock, Shares, Acquired (in Shares) |  |  | 52,500,000 |  |  | 8,700,000 |  |  |  | 61,200,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Accelerated Share Repurchases, Settlement (Payment) or Receipt |  |  | $ (1,250) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Morgan Stanley [Member] | Oct. 28, 2015 [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Note 17 - Shareholders' Equity (Details) [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stock Repurchase Program, Authorized Amount |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 1,250 |  |  |  |
Treasury Stock, Shares, Acquired (in Shares) |  | 53,100,000 |  |  |  |  |  |  | 69,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Accelerated Share Repurchases, Settlement (Payment) or Receipt |  | $ (1,250) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Treasury Stock, Value, Acquired, Cost Method |  | 1,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Adjustments to Additional Paid in Capital, Other |  | $ (250) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Morgan Stanley [Member] | Subsequent Event [Member] | Oct. 28, 2015 [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Note 17 - Shareholders' Equity (Details) [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Treasury Stock, Shares, Acquired (in Shares) | 15,900,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Common Stock [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Note 17 - Shareholders' Equity (Details) [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Convertible Preferred Stock, Shares Issued upon Conversion (in Shares) |  |  |  | 50,000 | 50,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |

X
- Definition Threshold period of specified consecutive trading days within which common stock price to conversion price of convertible preferred stock must exceed threshold percentage for a specified number of trading days to trigger conversion feature, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References No definition available. + Details
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- Definition The minimum closing price of Common Stock for the Company to exercise the option to convert some or all of the shares of Preferred Stock to Common Stock. + References No definition available. + Details
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- Definition Amount of stock repurchase plan authorized. + References No definition available. + Details
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