Earlier authorized shares under stock based compensation.

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Performance based restricted stock awards granted in percent.

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Remaining shares available for future grants under the Plan.

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Represents the expense recognized during the period arising from equity-based compensation arrangements (for example, shares of stock, unit, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees.

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-Name Accounting Standards Codification

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Face amount or stated value per share of common stock.

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The maximum number of common shares permitted to be issued by an entity's charter and bylaws.

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Amount of paid and unpaid common stock dividends declared with the form of settlement in cash.

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-Name Regulation S-X (SX)

-Number 210

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Unrecognized cost of unvested share-based compensation awards.

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Weighted average period over which unrecognized compensation is expected to be recognized for equity-based compensation plans, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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The total recognized tax benefit related to compensation cost for equity-based payment arrangements recognized in income during the period.

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Disclosure of the aggregate tax benefit realized from the exercise of stock options and the conversion of similar instruments during the annual period.

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Face amount or stated value per share of preferred stock nonredeemable or redeemable solely at the option of the issuer.

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The maximum number of nonredeemable preferred shares (or preferred stock redeemable solely at the option of the issuer) permitted to be issued by an entity's charter and bylaws.

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Total number of nonredeemable preferred shares (or preferred stock redeemable solely at the option of the issuer) issued to shareholders (includes related preferred shares that were issued, repurchased, and remain in the treasury). May be all or portion of the number of preferred shares authorized. Excludes preferred shares that are classified as debt.

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Aggregate share number for all nonredeemable preferred stock (or preferred stock redeemable solely at the option of the issuer) held by stockholders. Does not include preferred shares that have been repurchased.

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The cash inflow associated with the amount received from holders exercising their stock options. This item inherently excludes any excess tax benefit, which the entity may have realized and reported separately.

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-Glossary Financing Activities

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Period which an employee's right to exercise an award is no longer contingent on satisfaction of either a service condition, market condition or a performance condition, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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-SubTopic 10

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Description of award terms as to how many shares or portion of an award are no longer contingent on satisfaction of either a service condition, market condition or a performance condition, thereby giving the employee the legal right to convert the award to shares, to sell the shares, and be entitled to the cash proceeds of such sale. For example, vesting may be expressed as being 25 percent of the shares under option on each anniversary of the grant date.

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General descriptive information regarding an arrangement under which employees and directors receive: (a) awards of equity shares, equity share options, or other equity instruments; or (b) the entity incurs liabilities to them: (1) in amounts based, at least in part, on the price of the entity's shares or other equity instruments; or (2) that require or may require settlement by issuance of the entity's shares. Such an arrangement is usually provided to employees and directors to compensate them, provide performance incentives to them, and to attract or retain their services. May also include pertinent information particular to a plan that is not elsewhere specified in the taxonomy.

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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).

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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).

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The number of equity-based payment instruments, excluding stock (or unit) options, that vested during the reporting period.

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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.

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The weighted average grant-date fair value of options granted during the reporting period as calculated by applying the disclosed option pricing methodology.

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Fair value of options vested. Excludes equity instruments other than options, for example, but not limited to, share units, stock appreciation rights, restricted stock.

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The floor of a customized range of exercise prices for purposes of disclosing shares potentially issuable under outstanding stock option awards on all stock option plans and other required information pertaining to awards in the customized range.

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The ceiling of a customized range of exercise prices for purposes of disclosing shares potentially issuable under outstanding stock option awards on all stock option plans and other required information pertaining to awards in the customized range.

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Number of shares that have been repurchased during the period and have not been retired and are not held in treasury. Some state laws may govern the circumstances under which an entity may acquire its own stock and prescribe the accounting treatment therefore. This element is used when state law does not recognize treasury stock.

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Equity impact of the value of stock that has been repurchased during the period and has not been retired and is not held in treasury. Some state laws may mandate the circumstances under which an entity may acquire its own stock and prescribe the accounting treatment therefore. This element is used when state law does not recognize treasury stock.

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Amount of stock repurchase plan authorized.

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Period which shares may be purchased under a stock repurchase plan authorized by an entity's Board of Directors, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Common Stock - Additional Information (Detail) (USD $)	0 Months Ended	12 Months Ended			0 Months Ended
Common Stock - Additional Information (Detail) (USD $)	Sep. 30, 2014	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012	Feb. 25, 2014	May 14, 2014
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of common stock, authorized		1,000,000,000us-gaap_CommonStockSharesAuthorized	1,000,000,000us-gaap_CommonStockSharesAuthorized
Number of preferred stock, authorized		10,000,000us-gaap_PreferredStockSharesAuthorized
Common stock, par value		$ 0.01	$ 0.01
Preferred stock, par value		$ 0.01
Preferred stock, shares issued		0us-gaap_PreferredStockSharesIssued
Preferred stock, shares outstanding		0us-gaap_PreferredStockSharesOutstanding
Aggregated cash dividends paid		$ 703,000,000us-gaap_DividendsCommonStockCash	$ 389,000,000us-gaap_DividendsCommonStockCash	$ 209,000,000us-gaap_DividendsCommonStockCash
Share repurchase program, authorized amount	3,000,000,000
Share repurchase program, duration	36 months
Share repurchases, shares		12,000,000
Share repurchases, value		779,000,000
Earlier authorized shares under stock based compensation		39,500,000
Duration of performance-based restricted stock awards, vested		Option plan generally vest over a three-year period starting one year from the date of grant and expire ten years from the date of grant.
Remaining shares available for future grants under the Plan		11,900,000
Stock option, Minimum Range		$ 8.43
Stock option, Maximum Range		$ 77.99
Compensation cost charged against income for share-based compensation arrangements		101,000,000	92,000,000	80,000,000
Income tax benefit recognized for share-based compensation arrangements		35,000,000	28,000,000	24,000,000
Weighted-average fair value of options granted		$ 25.60	$ 24.11	$ 30.01
Total intrinsic value of options exercised		111,000,000	64,000,000
Total unrecognized compensation cost related to nonvested stock options		69,000,000
Weighted-average period recognition of unrecognized compensation cost related to nonvested RSA's		2 years
Total fair value of stock options vested		67,000,000	64,000,000	55,000,000
Cash received from option exercises		108,000,000	58,000,000	113,000,000
Tax benefit realized for the tax deductions from option exercises		44,000,000	39,000,000	42,000,000
Restricted stock granted		708,821	822,281	523,218
Restricted stock granted fair value		$ 70.14	$ 63.69	$ 77.26
Description of performance goal		Performance against the ROC goal is determined by comparing the performance of the Company's actual ROC performance average for each of the three years of the performance period against the ROC goal set by the Company's Compensation Committee.
Total number of restricted stock awards and restricted stock units granted		348,981	368,984	441,243
Restricted Stock and Restricted Stock Units [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Restricted stock granted					426,272
Restricted stock granted fair value					$ 69.00
TSR Award [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Performance based restricted stock awards granted in percent					50.00%
ROC Award [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Performance based restricted stock awards granted in percent					50.00%
Restricted Stock Awards [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Duration of performance-based restricted stock awards, vested		The stock options vest over a three-year period from the grant date while the restricted stock and restricted stock units vest on the third anniversary of the date of grant.
Total unrecognized compensation cost related to nonvested stock options		$ 44,000,000
Weighted-average period recognition of unrecognized compensation cost related to nonvested RSA's		2 years
Restricted stock granted						18,736
Restricted stock granted fair value		$ 70.14	$ 63.69	$ 77.26		$ 68.89
Performance based restricted stock awards vested, number of years					3 years
Total number of restricted stock awards and restricted stock units granted		348,981	368,984	441,243
Minimum [Member] \| Performance-base restricted stock [Member] \| Senior Management Employees [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Restricted stock granted					0
Maximum [Member] \| Performance-base restricted stock [Member] \| Senior Management Employees [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Restricted stock granted					436,390