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Capital Stock (Textuals) (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2021 | Mar. 31, 2021 | Jun. 30, 2020 | Mar. 31, 2020 | Jun. 30, 2021 | Jun. 30, 2020 | Aug. 24, 2015
Equity, Class of Treasury Stock [Line Items] |  |  |  |  |  |  |
Shares repurchased (less than $1 million) |  | $ 60 |  | $ 50 |  |  |
Share Repurchase Programs |  |  |  |  |  |  |
Equity, Class of Treasury Stock [Line Items] |  |  |  |  |  |  |
Shares repurchased (in shares - less than 0.1 million) | 100,000 |  | 100,000 |  | 700,000 | 800,000 |
Shares repurchased (less than $1 million) | $ 1 |  | $ 1 |  | $ 68 | $ 60 |
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 |  |  |  | 600,000 | 700,000 |
Shares repurchased (less than $1 million) |  |  |  |  | $ 60 | $ 50 |
Remaining authorized amount of repurchase | $ 228 |  |  |  | $ 228 |  |
Settlement of Employee Tax Withholding Obligations |  |  |  |  |  |  |
Equity, Class of Treasury Stock [Line Items] |  |  |  |  |  |  |
Shares repurchased (in shares - less than 0.1 million) | 100,000 |  | 100,000 |  | 100,000 | 100,000 |
Shares repurchased (less than $1 million) | $ 1 |  | $ 1 |  | $ 8 | $ 10 |

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