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Capital Stock (Details) - USD ($) |  | 3 Months Ended | 42 Months Ended |
--- | --- | --- | --- | ---
Apr. 10, 2017 | Mar. 31, 2017 | Mar. 31, 2016 | Mar. 31, 2017 | Feb. 02, 2017
Class of Stock [Line Items] |  |  |  |  |
Cash dividends paid |  | $ 25,000,000 | $ 19,000,000 |  |
Cash dividends declared (dollars per share) |  | $ 0.10 | $ 0.07 |  |
Payments for repurchase of stock |  | $ 25,000,000 | $ 50,000,000 |  |
Common Stock |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |
Cash dividends paid |  | $ 25,000,000 |  |  |
Stock repurchase program, authorized amount |  |  |  |  | $ 2,100,000,000.0
Shares repurchased (in shares) |  | 696,494 |  | 31,910,604 |
Average price of shares repurchased (dollars per share) |  | $ 35.89 |  | $ 29.41 |
Payments for repurchase of stock |  | $ 25,000,000 |  | $ 938,000,000 |
Subsequent Event | Common Stock |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |
Cash dividends declared (dollars per share) | $ 0.1 |  |  |  |
Cash dividends declared | $ 25,000,000 |  |  |  |
Payments for Share Repurchases Related to Employee Stock Based Compensation | Common Stock |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |
Shares repurchased (in shares) |  | 0 |  |  |

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