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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- Definition

As of the balance sheet date, the aggregate unrecognized cost of equity-based awards made to employees under equity-based compensation awards that have yet to vest.

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The weighted average period over which unrecognized compensation is expected to be recognized for equity-based compensation plans, using a decimal to express in number of years.

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- Definition

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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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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- Definition

Equity-based compensation cost during the period with respect to the award, which will be recognized in income (as well as the total recognized tax benefit) or capitalized as part of the cost of an asset.

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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).

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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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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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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).

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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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Share based Compensation Arrangement by Share based Payment Award, Equity Instruments Other than Options, Nonvested in Period, Weighted Average Grant Date Fair Value

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Share Based Compensation Arrangement By Share Based Payment Award Expiration

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Share based Compensation, Shares Authorized, Performance Target, Earned

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Share-Based Compensation - Additional Information (Detail) (USD $) In Millions, except Share data, unless otherwise specified	12 Months Ended
	Sep. 30, 2011 Year	Sep. 30, 2010	Sep. 30, 2009
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Maximum number of Class A Common Stock authorized for issuance under the 2007 Equity Incentive Compensation Plan ("the "EIP")	59,000,000
Expiration period from the date of grant	10 years
Share-based compensation expense	$ 154	$ 135	$ 115
Share-based compensation cost immediately recognized as expense	6
Total intrinsic value from options exercised	77	42	16
Tax benefit realized from options exercised	28	15	5
Total fair value of RSAs and RSUs vested	55	32	78
Performance shares earned during the performance period	295,736
Unrecognized compensation cost	35
Total unrecognized compensation cost related to non-vested options expected to be recognized over a weighted average period (in years)	1.3
CyberSource Corporation Acquisition
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period from the date of grant		3 years
Share-based compensation expense	4
Total unrecognized compensation cost related to non-vested options expected to be recognized over a weighted average period (in years)		3
Employee Stock Option
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Expiration period from the date of grant	10 years
Vesting period from the date of grant	3 years
Restricted Stock Awards and Restricted Stock Units Issued in Connection with Equity Incentive Compensation Plan (EIP)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period from the date of grant	3 years
Restricted Stock Awards
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unrecognized compensation cost	74
Weighted-average grant-date fair value of stock granted	$ 79.80	$ 79.58	$ 56.46
Restricted Stock Units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unrecognized compensation cost	19
Weighted-average grant-date fair value of stock granted	$ 79.97	$ 79.59	$ 56.64
Restricted Stock Awards and Restricted Stock Units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total unrecognized compensation cost related to non-vested options expected to be recognized over a weighted average period (in years)	1.5
Performance-Based Restricted Stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Weighted average grant date fair value per share, Restricted stock and performance shares	$ 85.05	$ 88.06	$ 56.06
Maximum \| Performance Based Shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period from the date of grant	3 years
Minimum \| Performance Based Shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period from the date of grant	2 years
Performance Based Shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unrecognized compensation cost	$ 10