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Capital Stock - Additional Information (Detail) - USD ($) | 12 Months Ended | 135 Months Ended |
--- | --- | --- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2017 | Oct. 27, 2006
Class of Stock [Line Items] |  |  |  |  |
Aggregate common stock and preferred stock authorized | 300,000,000 |  |  | 300,000,000 |
Common stock, authorized | 250,000,000 | 250,000,000 |  | 250,000,000 |
Common stock, par value | $ 1 | $ 1.00 |  | $ 1 |
Preferred Stock, authorized | 50,000,000 |  |  | 50,000,000 |
Preferred Stock, outstanding | 0 | 0 |  | 0 |
Dividends declared per common share | $ 0.512 | $ 0.496 | $ 0.4732 |  |
Share repurchase program |  |  |  |  | $ 1,000,000,000
Shares purchased under share repurchase program | 800,000 | 2,000,000.0 | 2,000,000.0 | 21,200,000 |
Cost of shares repurchased under share repurchase program | $ 30,000,000.0 | $ 70,000,000.0 | $ 80,000,000.0 | $ 859,400,000 |
Number of share repurchased under settlement of employee tax withholding obligations | 100,000 | 200,000 | 100,000 |  |
Shares repurchased aggregate value under settlement of employee tax withholding obligations | $ 2,900,000 | $ 7,800,000 | $ 4,000,000.0 |  |
Common Stock [Member] |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |
Shares purchased under share repurchase program | 900,000 | 2,200,000 | 2,100,000 |  |
Cost of shares repurchased under share repurchase program | $ 900,000 | $ 2,200,000 | $ 2,100,000 |  |
Activity from stock incentive plans | 700,000 | 1,100,000 | 600,000 |  |

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- Definition Aggregate dividends declared during the period for each share of common stock outstanding. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.3-04) -URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187085-122770 + Details
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