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Capital Stock (Textuals) (Details) - USD ($) shares in Millions, $ in Millions | 3 Months Ended |
--- | --- | ---
Mar. 31, 2020 | Mar. 31, 2019 | Aug. 24, 2015
Equity, Class of Treasury Stock [Line Items] |  |  |
Shares repurchased (less than $1 million) | $ 50 | $ 25 |
Share Repurchase Programs |  |  |
Equity, Class of Treasury Stock [Line Items] |  |  |
Shares repurchased (in shares - less than 0.1 million) | 0.8 | 0.5 |
Shares repurchased (less than $1 million) | $ 60 | $ 39 |
2015 Stock Repurchase Program |  |  |
Equity, Class of Treasury Stock [Line Items] |  |  |
Stock repurchase program, authorized amount |  |  | $ 500
Shares repurchased (in shares - less than 0.1 million) | 0.7 | 0.3 |
Shares repurchased (less than $1 million) | $ 50 | $ 25 |
Remaining authorized amount of repurchase | $ 288 |  |
Settlement of Employee Tax Withholding Obligations |  |  |
Equity, Class of Treasury Stock [Line Items] |  |  |
Shares repurchased (in shares - less than 0.1 million) | 0.1 | 0.2 |
Shares repurchased (less than $1 million) | $ 10 | $ 14 |

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