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Shareholders' Equity (Narrative) (Details) - USD ($) $ / shares in Units, $ in Millions | 3 Months Ended | 9 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | --- | ---
Sep. 30, 2018 | Sep. 30, 2017 | Jun. 30, 2017 | Sep. 30, 2018 | Sep. 30, 2017 | Dec. 31, 2017 | Apr. 26, 2018 | Dec. 31, 2016
Preferred Stock, Par or Stated Value Per Share | $ 100 |  |  | $ 100 |  | $ 100 |  |
Treasury Stock, Shares, Acquired |  |  |  |  |  | 84,400,000 |  |
Treasury Stock, Value, Acquired |  |  |  |  |  | $ 2.4 |  |
Payments for Repurchase of Common Stock |  |  |  | $ 1,880.0 | $ 2,064.0 |  |  |
The 2016 Repurchase Program [Member] |  |  |  |  |  |  |  |
Stock Repurchase Program, Authorized Amount |  |  |  |  |  |  |  | $ 4,000.0
The 2015 and 2016 Repurchase Program [Member] | Open Market [Member] |  |  |  |  |  |  |  |
Treasury Stock, Shares, Acquired |  |  |  |  |  | 50,100,000 |  |
Treasury Stock, Value, Acquired |  |  |  |  |  | $ 1,400.0 |  |
The 2017 ASR Agreement [Member] |  |  |  |  |  |  |  |
Treasury Stock, Shares, Acquired |  | 17,200,000 | 17,100,000 |  |  |  |  |
Payments for Repurchase of Common Stock |  | $ 500.0 | $ 500.0 |  |  |  |  |
The 2018 Repurchase Program [Member] |  |  |  |  |  |  |  |
Stock Repurchase Program, Authorized Amount |  |  |  |  |  |  | $ 2,000.0 |
The 2016 and 2018 Repurchase Program [Member] | Open Market [Member] |  |  |  |  |  |  |  |
Treasury Stock, Shares, Acquired | 11,800,000 |  |  | 63,400,000 |  |  |  |
Treasury Stock, Value, Acquired | $ 384.0 |  |  | $ 1,900.0 |  |  |  |
Common Stock [Member] |  |  |  |  |  |  |  |
Convertible Preferred Stock, Shares Issued upon Conversion | 50,000 |  |  | 50,000 |  |  |  |
Series A Convertible Preferred Stock [Member] | Samsung Corning Precision Materials Co., Ltd. [Member] |  |  |  |  |  |  |  |
Convertible Preferred Stock, Shares Issued upon Conversion | 2,300 |  |  | 2,300 |  |  |  |

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