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Capital Stock - Additional Information (Detail) - USD ($) | 12 Months Ended | 111 Months Ended |
--- | --- | --- | ---
Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2015 | 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 | $ 0.4732 | $ 0.44 | $ 0.4 |  |
Share repurchase program |  |  |  |  | $ 1,000,000,000
Shares purchased under share repurchase program | 2,000,000 | 1,100,000 | 3,100,000 | 18,400,000 |
Cost of shares repurchased under share repurchase program | $ 80,000,000 | $ 50,000,000 | $ 85,200,000 | $ 759,300,000 |
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 | $ 4,000,000 | $ 10,200,000 | $ 2,700,000 |  |
Common Stock held in treasury account | 15,000,000 | 13,300,000 |  | 15,000,000 |
Common Stock [Member] |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |
Shares purchased under share repurchase program | 2,100,000 | 1,400,000 | 3,200,000 |  |
Cost of shares repurchased under share repurchase program | $ 2,100,000 | $ 1,400,000 | $ 3,200,000 |  |
Activity from stock incentive plans | 600,000 | 1,400,000 | 2,300,000 |  |

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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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