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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The amount of expense, net of income tax, 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.

+ References

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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

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

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- Definition

The estimated dividend rate (a percentage of the share price) to be paid (expected dividends) to holders of the underlying shares over the option's term.

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- Definition

The period of time an equity-based award is expected to be outstanding. An equity-based award's expected term is generally determined based on, among other factors, the instrument's contractual term and the effects of employees' expected exercise and post-vesting employment termination behavior.

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- Definition

Discloses use of the simplified method to calculate the expected term that stock option awards under the specified plan will exist before being exercised or terminated, the reason and justification for its use, and the periods for which the method was used if it was not used in all periods presented.

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The estimated measure of the percentage by which a share price is expected to fluctuate during a period. Volatility also may be defined as a probability-weighted measure of the dispersion of returns about the mean. The volatility of a share price is the standard deviation of the continuously compounded rates of return on the share over a specified period. That is the same as the standard deviation of the differences in the natural logarithms of the stock prices plus dividends, if any, over the period.

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- Definition

The risk-free interest rate assumption that is used in valuing an option on its own shares.

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- Definition

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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- Definition

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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Accounting For Share-Based Compensation 1 (Details) (USD $) In Millions, except Per Share data, unless otherwise specified	3 Months Ended		6 Months Ended
	Sep. 30, 2011	Sep. 30, 2010	Sep. 30, 2011 Year	Sep. 30, 2010 Year
Recognized share-based compensation
Share-based compensation expense before tax	$ 16	$ 21	$ 41	$ 40
Income Tax Benefit	(6)	(7)	(14)	(13)
Net share-based compensation expense	10	14	27	27
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unrecognized Compensation Costs	129		129
Weighted Average Period Expected to Recognized			2.3
Stock Purchase Plan, Fair Value Assumptions
Weighted average fair value			$ 5.99	$ 5.55
Dividend yield			0.91%	0.83%
Expected volatility factor			33.00%	34.00%
Risk-free interest rate			1.70%	1.80%
Expected life (in years)			4.5	4.5
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Term, Simplified Method			The Company’s computation of expected life was determined based on the simplified method (the average of the vesting period and option term), due to changes in the vesting terms, the contractual lives and the population of employees granted options compared with the Company’s historical grants.
Costs of licensing and maintenance [Member]
Recognized share-based compensation
Share-based compensation expense before tax	1	1	2	2
Costs of professional services [Member]
Recognized share-based compensation
Share-based compensation expense before tax	1	1	2	2
Selling and marketing [Member]
Recognized share-based compensation
Share-based compensation expense before tax	6	8	16	15
General and administrative [Member]
Recognized share-based compensation
Share-based compensation expense before tax	4	6	12	10
Product development and enhancements [Member]
Recognized share-based compensation
Share-based compensation expense before tax	4	5	9	11
Stock Option Awards [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unrecognized Compensation Costs	5		5
Weighted Average Period Expected to Recognized			2.3
Restricted Stock Units [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unrecognized Compensation Costs	18		18
Weighted Average Period Expected to Recognized			2.2
Restricted Stock Awards [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unrecognized Compensation Costs	75		75
Weighted Average Period Expected to Recognized			2.1
Performance Share Units [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unrecognized Compensation Costs	$ 31		$ 31
Weighted Average Period Expected to Recognized			2.8