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Stock Plans - Additional Information (Detail) (USD $) Share data in Millions, except Per Share data, unless otherwise specified | 6 Months Ended | 12 Months Ended | 1 Months Ended | 6 Months Ended | 12 Months Ended | 1 Months Ended | 6 Months Ended | 1 Months Ended | 6 Months Ended | 1 Months Ended
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Jun. 30, 2014 | Jun. 30, 2013 | Dec. 31, 2013 | Dec. 31, 2013 Common Class A | Jun. 30, 2014 Common Class A | Dec. 31, 2013 Common Class A | May 31, 2014 Common Class A Accelerated Share Repurchase Program | Dec. 03, 2013 Common Class A Accelerated Share Repurchase Program | May 31, 2014 Common Class A Accelerated Share Repurchase Program | Jun. 30, 2014 Restricted And Deferred Stock | May 31, 2014 Amended 2005 Plan | Feb. 28, 2014 Annual Equity Program | Feb. 28, 2014 Annual Equity Program Restricted And Deferred Stock | Jun. 30, 2014 Off Cycle | Jun. 30, 2014 Off Cycle Restricted And Deferred Stock | Jan. 31, 2014 Long-Term Incentive Plan Restricted And Deferred Stock
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 |  |  |  |  |  |  |  |  |  |  | 90.1 |  |  |  |  |
Stock options granted to eligible employees | 10.0 |  |  |  |  |  |  |  |  |  |  | 9.9 |  | 0.1 |  |
Stock options granted to eligible employees, exercise price | $ 34.16 |  |  |  |  |  |  |  |  |  |  | $ 34.17 |  | $ 34.12 |  |
Stock options granted to eligible employees, options exercised | 5.3 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Intrinsic value of stock options exercised | $ 79,100,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Granted shares |  |  |  |  |  |  |  |  |  | 3.9 |  |  | 2.0 |  | 0.7 | 1.2
Granted shares fair value, per share |  |  |  |  |  |  |  |  |  | $ 34.05 |  |  | $ 34.17 |  | $ 32.24 | $ 34.97
Number of restricted and deferred shares of stock vested |  |  |  |  |  |  |  |  |  | 3.9 |  |  |  |  |  |
Market value of vested restricted and deferred stock |  |  |  |  |  |  |  |  |  | 135,600,000 |  |  |  |  |  |
Stock repurchase value |  |  |  |  |  | 7,700,000,000 |  |  |  |  |  |  |  |  |  |
Number of shares repurchased |  |  |  |  | 26.0 |  | 5.1 | 44.8 | 49.9 |  |  |  |  |  |  |
Cost of shares repurchased | 720,000,000 |  | 2,900,000,000 | 200,000,000 | 900,000,000 |  | 200,000,000 | 1,500,000,000 |  |  |  |  |  |  |  |
Average cost of shares repurchased |  |  |  |  | $ 35.13 |  |  |  |  |  |  |  |  |  |  |
Stock repurchase remaining amount |  |  |  |  | 4,000,000,000 |  |  |  |  |  |  |  |  |  |  |
Payments for shares repurchased | 720,000,000 | 92,000,000 |  |  | 700,000,000 |  |  | 1,700,000,000 |  |  |  |  |  |  |  |
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 amount needed to adjust previously recorded stockholders' equity balances to the actual aggregate amounts paid, whether in cash or other consideration, to acquire all of the shares purchased under an Accelerated Share Repurchase arrangement. + References No definition available. + Details
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- Definition Final price paid per share for the purchase of the targeted number of shares, determined by an average market price over a fixed period of time. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 30 -Section 25 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=6405686&loc=d3e22802-112653 + Details
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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 Fair value of share-based awards for which the grantee gained the right by satisfying service and performance requirements, to receive or retain shares or units, other instruments, or cash. + 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 (d)(2) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Number of additional shares authorized for issuance under an established share-based compensation plan. + References No definition available. + 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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- Definition The difference between the maximum number of shares (or other type of equity) authorized for issuance under the plan (including the effects of amendments and adjustments), and the sum of: 1) the number of shares (or other type of equity) already issued upon exercise of options or other equity-based awards under the plan; and 2) shares (or other type of equity) reserved for issuance on granting of outstanding awards, net of cancellations and forfeitures, if applicable. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Amount of accumulated difference between fair value of underlying shares on dates of exercise and exercise price on options exercised (or share units converted) into shares. + 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 (d)(2) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Net number of share options (or share units) granted during the 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)(1)(iv)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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