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Years from date of grant that stock options expire

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Share Based Compensation Arrangement by Share based Payment Award, Vesting Percentage

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Tax benefit associated with any equity-based compensation plan other than an employee stock ownership plan (ESOP). The tax benefit results from the deduction by the entity on its tax return for an award of stock that exceeds the cumulative compensation cost for common stock or preferred stock recognized for financial reporting. Includes any resulting tax benefit that exceeds the previously recognized deferred tax asset (excess tax benefits).

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Aggregate number of common shares reserved for future issuance.

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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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Description of the period of time over 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, which may be expressed in a variety of ways (for example, in years, month and year).

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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 total fair value of equity-based awards for which the grantee gained the right during the reporting period, by satisfying service and performance requirements, to receive or retain shares or units, other instruments, or cash in accordance with the terms of the arrangement.

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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.

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The total accumulated difference between fair values of underlying shares on dates of exercise and exercise price on options which were exercised (or share units converted) into shares during the reporting period under the plan.

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The number of shares reserved for issuance under stock option agreements awarded under the plan that validly exist and are outstanding as of the balance sheet date, including vested options.

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Description of pertinent provisions of equity-based compensation awards that have actual or potential impact upon the company's financial statements.

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Share-based Compensation - Additional Information (Detail) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009	Dec. 31, 2008
Schedule of Share based Compensation Arrangements by Share based Payment Award, Equity Instruments, Other Than Options, Performance Share Units [Line Items]
Description of share based compensation plan	The Company maintains a share-based compensation plan which authorizes the granting of various equity-based incentives including stock options and restricted stock units (RSUs) to employees and nonemployee directors.
Share-based compensation plan, number of shares of common stock reserved for issuance	61.4
Outstanding stock options	31.7	37.4	47.8	53.4
Stock options, number of years to expire	10 years
Proceeds from stock option exercises	$ 334.0	$ 463.1	$ 332.1
Tax benefit on stock option exercises and other	116.7	146.1	93.3
RSUs vested, total fair value	55.5	66.8	59.9
Thirteen Year Stock Options Granted Between May 1999 and December 2000
Schedule of Share based Compensation Arrangements by Share based Payment Award, Equity Instruments, Other Than Options, Performance Share Units [Line Items]
Stock options, terms	Stock options to purchase common stock are granted with an exercise price equal to the closing market price of the Company’s stock on the date of grant. Substantially all of the options become exercisable in four equal installments, beginning a year from the date of the grant
Outstanding stock options	3.5
Stock options, number of years to expire	13 years
Stock Compensation Plan
Schedule of Share based Compensation Arrangements by Share based Payment Award, Equity Instruments, Other Than Options, Performance Share Units [Line Items]
Share-based compensation plan, number of Shares of common stock available for future grants	27.6
Stock Option
Schedule of Share based Compensation Arrangements by Share based Payment Award, Equity Instruments, Other Than Options, Performance Share Units [Line Items]
Stock options exercised, total intrinsic value	416.5	500.8	302.5
Proceeds from stock option exercises	334.0
Tax benefit on stock option exercises and other	110.6
Restricted Stock Units (RSUs)
Schedule of Share based Compensation Arrangements by Share based Payment Award, Equity Instruments, Other Than Options, Performance Share Units [Line Items]
Tax benefit on stock option exercises and other	$ 6.1
Vesting percentage	100.00%
Vesting period	3 years