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Capital Stock, Dividends and Common Stock Repurchase Program (Detail) - USD ($) $ in Millions | 1 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2017 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Capital Stock, Dividends and Common Stock Repurchase Program |  |  |  |
Common stock, shares authorized | 1,500,000,000 | 1,500,000,000 | 1,500,000,000 |
Common stock, par value | $ 0.01 | $ 0.01 | $ 0.01 |
Common stock, shares issued | 630,282,461 | 630,282,461 | 630,282,461 |
Number of common shares outstanding at year-end | 433,300,000 | 433,300,000 | 439,300,000 | 447,200,000
Preferred stock shares authorized | 10,000,000 | 10,000,000 |  |
Preferred stock par value per share | $ 0.01 | $ 0.01 |  |
Preferred stock shares outstanding | 0 | 0 |  |
Cash dividends |  | $ 750 | $ 726 | $ 695
Cash dividends declared and paid per common share |  | $ 1.70 | $ 1.64 | $ 1.54
Quarterly common stock dividend per share | 0.425 |  |  |
Expected quarterly common stock dividend per share | $ 0.465 |  |  |

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- Definition The maximum number of common shares permitted to be issued by an entity's charter and bylaws. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(29)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition Total number of common shares of an entity that have been sold or granted to shareholders (includes common shares that were issued, repurchased and remain in the treasury). These shares represent capital invested by the firm's shareholders and owners, and may be all or only a portion of the number of shares authorized. Shares issued include shares outstanding and shares held in the treasury. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(29)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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