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Stockholders' Equity (Details) - USD ($) $ / shares in Units, $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2018 | Jun. 30, 2018 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Stockholders' Equity, Number of Shares, Par Value and Other Disclosures [Abstract] |  |  |  |  |
Preferred stock, shares authorized | 100,000 |  | 100,000 | 100,000 |
Preferred stock, par value per share | $ 100 |  | $ 100 | $ 100 |
Common stock, shares authorized | 500,000,000 |  | 500,000,000 | 500,000,000 |
Common stock, par value per share | $ 1.00 |  | $ 1.00 | $ 1.00 |
Common stock, shares issued | 257,822,352 |  | 257,822,352 | 256,992,261 |
Number of treasury shares held | 112,905,810 |  | 112,905,810 | 102,168,868 |
Share Repurchases [Line Items] |  |  |  |  |
ExpectedShareRepurchaseInNovember2017 |  |  | $ 1,000,000 |  |
Accelerated Share Repurchases, Settlement (Payment) or Receipt | $ 700,000 |  | 700,000 |  |
Payments for Repurchase of Common Stock |  |  | 894,977 | $ 105,023 | $ 0
January 2015 Authorization [Member] |  |  |  |  |
Share Repurchases [Line Items] |  |  |  |  |
Payments for Repurchase of Common Stock |  |  | $ 44,977 | $ 105,023 |
Shares repurchased |  |  | 440,608 | 1,059,682 |
Average price per share for repurchased shares (in dollars per share) |  |  | $ 102.08 | $ 99.11 |
Remaining number of shares authorized to be repurchased | 5,271,168 |  | 5,271,168 |  |
February 2018 Authorization [Member] |  |  |  |  |
Share Repurchases [Line Items] |  |  |  |  |
Accelerated Share Repurchases, Final Price Paid Per Share |  |  | $ 81.94 |  |
Accelerated Shares Repurchased | 1,463,815 | 7,078,751 | 8,542,566 |  |
Number of shares authorized to be repurchased | 20,000,000 |  | 20,000,000 |  |
Payments for Repurchase of Common Stock |  |  | $ 150,000 |  |
Shares repurchased |  |  | 1,753,768 |  |
Average price per share for repurchased shares (in dollars per share) |  |  | $ 85.53 |  |
Remaining number of shares authorized to be repurchased | 9,703,666 |  | 9,703,666 |  |

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