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Shareholders' Equity (Narrative) (Details) - USD ($) $ in Millions | 3 Months Ended |  |
--- | --- | --- | ---
Mar. 31, 2019 | Mar. 31, 2018 | Apr. 26, 2018 | Dec. 31, 2016
Treasury Stock, Value, Acquired | $ 244 | $ 814 |  |
The 2016 Repurchase Program [Member] |  |  |  |
Stock Repurchase Program, Authorized Amount |  |  |  | $ 4
Treasury Stock, Shares, Acquired |  | 27,100,000 |  |
Treasury Stock, Value, Acquired |  | $ 814 |  |
The 2018 Repurchase Program [Member] |  |  |  |
Stock Repurchase Program, Authorized Amount |  |  | $ 2 |
Treasury Stock, Shares, Acquired | 7,800,000 |  |  |
Treasury Stock, Value, Acquired | $ 244 |  |  |
Common Stock [Member] |  |  |  |
Convertible Preferred Stock, Shares Issued upon Conversion | 50,000 |  |  |
Series A Convertible Preferred Stock [Member] |  |  |  |
Convertible Preferred Stock, Shares Issued upon Conversion | 2,300 |  |  |

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