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Shareholders' Equity (Narrative) (Details) - USD ($) $ / shares in Units, $ in Millions |  |  |  |  |  |  |  | 1 Months Ended | 3 Months Ended | 12 Months Ended
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Feb. 06, 2019 | Feb. 05, 2019 | Feb. 06, 2018 | Feb. 05, 2018 | Feb. 01, 2017 | Jan. 31, 2017 | Jan. 15, 2014 | Jul. 31, 2016 | Sep. 30, 2017 | Jun. 30, 2017 | Dec. 31, 2016 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Dividends declared per common share |  |  |  |  |  |  |  |  |  |  |  | $ 0.72 | $ 0.62 | $ 0.54
Preferred Stock, Par or Stated Value Per Share |  |  |  |  |  |  |  |  |  |  |  | $ 100 | $ 100 |
Treasury Stock, Shares, Acquired |  |  |  |  |  |  |  |  |  |  |  |  | 84,400,000 | 197,100,000
Treasury Stock, Value, Acquired |  |  |  |  |  |  |  |  |  |  |  | $ 2,230 | $ 2,448 | $ 4,244
Payments for Repurchase of Common Stock |  |  |  |  |  |  |  |  |  |  |  | 2,227 | $ 2,452 | $ 4,227
Open Market [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Treasury Stock, Shares, Acquired |  |  |  |  |  |  |  |  |  |  |  |  | 50,100,000 |
Treasury Stock, Value, Acquired |  |  |  |  |  |  |  |  |  |  |  |  | $ 1,400 |
The 2015 Repurchase Program [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Treasury Stock, Shares, Acquired |  |  |  |  |  |  |  |  |  |  |  |  |  | 110,000,000
Treasury Stock, Value, Acquired |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 2,200
The 2016 ASR Agreement [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Treasury Stock, Shares, Acquired |  |  |  |  |  |  |  | 74,400,000 |  |  | 12,300,000 |  |  | 86,700,000
Treasury Stock, Value, Acquired |  |  |  |  |  |  |  | $ 2,000 |  |  |  |  |  |
The 2016 Repurchase Program [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stock Repurchase Program, Authorized Amount |  |  |  |  |  |  |  |  |  |  | $ 4,000 |  |  | $ 4,000
The 2017 ASR Agreement [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Treasury Stock, Shares, Acquired |  |  |  |  |  |  |  |  | 17,200,000 | 17,100,000 |  |  |  |
Payments for Repurchase of Common Stock |  |  |  |  |  |  |  |  | $ 500 | $ 500 |  |  |  |
The 2018 Repurchase Program [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stock Repurchase Program, Authorized Amount |  |  |  |  |  |  |  |  |  |  |  | $ 2,000 |  |
The 2016 and 2018 Repurchase Program [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Treasury Stock, Shares, Acquired |  |  |  |  |  |  |  |  |  |  |  | 74,800,000 |  |
Payments for Repurchase of Common Stock |  |  |  |  |  |  |  |  |  |  |  | $ 2,200 |  |
Common Stock [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage increase of dvidend declared |  |  | 16.10% |  | 14.80% |  |  |  |  |  |  |  |  |
Dividends declared per common share |  |  | $ 0.18 | $ 0.155 | $ 0.155 | $ 0.135 |  |  |  |  |  |  |  |
Convertible Preferred Stock, Shares Issued upon Conversion |  |  |  |  |  |  | 50,000 |  |  |  |  |  |  |
Convertible Preferred Stock, Threshold Trading Days |  |  |  |  |  |  | 25 days |  |  |  |  |  |  |
Convertible Preferred Stock, Threshold Consecutive Trading Days |  |  |  |  |  |  | 40 days |  |  |  |  |  |  |
Minimum Closing Price of Common Stock for the Company to Exercise Option to Convert Preferred Stock |  |  |  |  |  |  | $ 35 |  |  |  |  |  |  |
Common Stock [Member] | Subsequent Event [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage increase of dvidend declared | 11.10% |  |  |  |  |  |  |  |  |  |  |  |  |
Dividends declared per common share | $ 0.20 | $ 0.18 |  |  |  |  |  |  |  |  |  |  |  |
Series A Convertible Preferred Stock [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Preferred Stock, Dividend Rate, Percentage |  |  |  |  |  |  | 4.25% |  |  |  |  |  |  |
Series A Convertible Preferred Stock [Member] | Samsung Corning Precision Materials Co., Ltd. [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Preferred Stock, Par or Stated Value Per Share |  |  |  |  |  |  | $ 100 |  |  |  |  |  |  |
Stock Issued During Period, Shares, Acquisitions |  |  |  |  |  |  | 1,900 |  |  |  |  |  |  |
Share Price |  |  |  |  |  |  | $ 1,000,000 |  |  |  |  |  |  |
Stock Issued During Period, Value, Acquisitions |  |  |  |  |  |  | $ 1,900 |  |  |  |  |  |  |
Stock Issued During Period, Value, New Issues |  |  |  |  |  |  | $ 400 |  |  |  |  |  |  |

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