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Stock Plans - Additional Information (Detail) (USD $) Share data in Millions, except Per Share data, unless otherwise specified | 9 Months Ended | 12 Months Ended | 9 Months Ended | 0 Months Ended |  |  | 1 Months Ended | 9 Months Ended | 1 Months Ended | 9 Months Ended | 12 Months Ended | 0 Months Ended | 1 Months Ended | 6 Months Ended
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Sep. 30, 2014 | Sep. 30, 2013 | Dec. 31, 2013 | Sep. 30, 2014 Restricted And Deferred Stock | May 21, 2014 Amended 2005 Plan | Sep. 30, 2014 Amended 2005 Plan | May 21, 2014 Amended 2005 Plan | Feb. 28, 2014 Annual Equity Program | Feb. 28, 2014 Annual Equity Program Restricted And Deferred Stock | Sep. 30, 2014 Off Cycle | Sep. 30, 2014 Off Cycle Restricted And Deferred Stock | Jan. 31, 2014 Long-Term Incentive Plan Restricted And Deferred Stock | Dec. 31, 2013 Common Class A | Sep. 30, 2014 Common Class A | Dec. 31, 2013 Common Class A | Dec. 03, 2013 Common Class A Accelerated Share Repurchase Program | May 31, 2014 Common Class A Accelerated Share Repurchase Program | May 31, 2014 Common Class A Accelerated Share Repurchase Program
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Additional number of shares available for issuance under stock option plan |  |  |  |  | 75.7 |  |  |  |  |  |  |  |  |  |  |  |  |
Shares authorized to be issued under stock option plan |  |  |  |  |  |  | 243.7 |  |  |  |  |  |  |  |  |  |  |
Shares available to be granted |  |  |  |  |  | 90.7 |  |  |  |  |  |  |  |  |  |  |  |
Stock options granted to eligible employees | 10.0 |  |  |  |  |  |  | 9.9 |  | 0.1 |  |  |  |  |  |  |  |
Stock options granted to eligible employees, exercise price | $ 34.18 |  |  |  |  |  |  | $ 34.17 |  | $ 35.20 |  |  |  |  |  |  |  |
Stock options granted to eligible employees, options exercised | 6.5 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Intrinsic value of stock options exercised | $ 98,400,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Granted shares |  |  |  | 4.0 |  |  |  |  | 2.0 |  | 0.8 | 1.2 |  |  |  |  |  |
Granted shares fair value, per share |  |  |  | $ 34.08 |  |  |  |  | $ 34.17 |  | $ 32.62 | $ 34.97 |  |  |  |  |  |
Number of restricted and deferred shares of stock vested |  |  |  | 4.0 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Market value of vested restricted and deferred stock |  |  |  | 137,600,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stock repurchase value |  |  |  |  |  |  |  |  |  |  |  |  | 7,700,000,000 |  | 7,700,000,000 |  |  |
Number of shares repurchased |  |  |  |  |  |  |  |  |  |  |  |  |  | 34.3 | 82.8 | 44.8 | 5.1 | 49.9
Cost of shares repurchased | 1,212,000,000 |  | 2,900,000,000 |  |  |  |  |  |  |  |  |  |  | 1,200,000,000 | 2,700,000,000 | 1,500,000,000 | 200,000,000 |
Payment for repurchase of common stock | 1,020,000,000 | 793,000,000 |  |  |  |  |  |  |  |  |  |  | 200,000,000 | 1,000,000,000 |  | 1,700,000,000 |  |
Average cost of shares repurchased |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 35.33 | $ 33.09 |  |  |
Stock repurchase remaining amount |  |  |  |  |  |  |  |  |  |  |  |  |  | 3,800,000,000 |  |  |  |
Additional paid in capital treasury stock |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 200,000,000 | $ 200,000,000 |
Accelerated share repurchases, average repurchase price per share |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 34.10

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- Definition The cash outflow to reacquire common stock during the period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Financing Activities -URI http://asc.fasb.org/extlink&oid=6513228 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 15 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3291-108585 + Details
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- Definition The number of grants made during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2)(iii)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The weighted average fair value at grant date for nonvested equity-based awards issued during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2)(iii)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The number of equity-based payment instruments, excluding stock (or unit) options, that vested during the reporting period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2)(iii)(2) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The maximum number of shares (or other type of equity) originally approved (usually by shareholders and board of directors), net of any subsequent amendments and adjustments, for awards under the equity-based compensation plan. As stock or unit options and equity instruments other than options are awarded to participants, the shares or units remain authorized and become reserved for issuance under outstanding awards (not necessarily vested). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a)(3) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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