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Capital Stock, Dividends and Common Stock Repurchase Program - Additional Information (Detail) - USD ($) | 1 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2016 | Nov. 30, 2016 | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Stock Repurchase Program [Line Items] |  |  |  |  |
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 |
Common stock, shares outstanding | 439,300,000 |  | 439,300,000 | 447,200,000 | 458,500,000
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 |  |  | $ 726,000,000 | $ 695,000,000 | $ 693,000,000
Cash dividends declared and paid per common share | $ 0.41 |  | $ 1.64 | $ 1.54 | $ 1.50
Common stock repurchases |  |  | $ 725,000,000 | $ 600,000,000 | $ 600,000,000
Maximum capital allocated for repurchases of shares | $ 750,000,000 |  | 750,000,000 |  |
Additional Paid-In Capital [Member] |  |  |  |  |
Stock Repurchase Program [Line Items] |  |  |  |  |
Common stock repurchases |  |  | 45,000,000 | (180,000,000) | $ 180,000,000
Accelerated Share Repurchase Agreement (ASR) [Member] |  |  |  |  |
Stock Repurchase Program [Line Items] |  |  |  |  |
Common stock repurchases |  | $ 225,000,000 |  | $ 600,000,000 |
Accelerated Share Repurchase Agreement (ASR) [Member] | Additional Paid-In Capital [Member] |  |  |  |  |
Stock Repurchase Program [Line Items] |  |  |  |  |
Common stock repurchases |  |  | $ 45,000,000 |  |
Dividend Declared [Member] |  |  |  |  |
Stock Repurchase Program [Line Items] |  |  |  |  |
Expected quarterly common stock dividend per share declared | $ 0.425 |  |  |  |
Dividends Payable, Year | 2017 |  | 2017 |  |

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- Definition Aggregate dividends paid 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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- Definition Face amount or stated value per share of common stock. + 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 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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- Definition Year the dividend will be paid, in CCYY format. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=6367179&loc=d3e4304-108586 + Details
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- Definition Equity impact of the cost of common and preferred stock that were repurchased during the period. Recorded using the cost method. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21463-112644 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 30 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6405813&loc=d3e23239-112655 Reference 3: 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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