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Share-Based Compensation (Details 3) (USD $) In Millions, except Per Share data, unless otherwise specified	12 Months Ended
	Mar. 31, 2012	Mar. 31, 2011	Mar. 31, 2010
Weighted average fair value
Per grant of stock options			$ 10
Per grant of nonvested stock units	$ 42	$ 42	$ 37
Share-based payment and stock option values
Intrinsic value of stock options exercised (millions)	$ 32.1	$ 75.5	$ 63.0
Fair value of nonvested stock units that vested (millions)	$ 118.7	$ 79.7	$ 38.9
Weighted average grant date fair value of nonvested stock units that vested	$ 38	$ 35	$ 32

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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- Definition

The weighted average fair value as of grant date pertaining to an equity-based award plan other than a stock (or unit) option plan 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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