Share-Based Compensation (Tables)

12 Months Ended

Mar. 31, 2012

Share-Based Compensation [Abstract]

Components Of Share-Based Compensation Expense And Related Tax Benefits

Years Ended March 31,
(In millions)		2012			2011			2010
RSUs (1)	$	97		$	79		$	47
PeRSUs (2)		24			27			39
Stock options		23			22			19
Employee stock purchase plan		10			9			9
Share-based compensation expense		154			137			114
Tax benefit for share-based compensation expense (3)		(55	)		(48	)		(41	)
Share-based compensation expense, net of tax	$	99		$	89		$	73

(1) This expense was primarily the result of PeRSUs awarded in prior years, which converted to RSUs due to the attainment of goals during the applicable years' performance period.

(2) Represents estimated compensation expense for PeRSUs that are conditional upon attaining performance objectives during the current year's performance period.

(3) Income tax expense is computed using the tax rates of applicable tax jurisdictions. Additionally, a portion of pre-tax compensation expense is not tax-deductible.

Schedule Of Weighted-Average Assumptions Used To Estimate The Fair Value Of Employee Stock Options

	Years Ended March 31,
	2012		2011		2010
Expected stock price volatility	27	%	29	%	33	%
Expected dividend yield	1.0	%	1.1	%	0.7	%
Risk-free interest rate	2	%	3	%	2	%
Expected life (in years)	5		5		5

Summary Of Options Outstanding

						Options Outstanding			Options Exercisable
					Number of				Number of
						Weighted-
					Options	Average		Weighted-	Options		Weighted-
					Outstanding	Remaining		Average	Exercisable		Average
	Range of Exercise				At Year End	Contractual		Exercise	at Year End		Exercise
		Prices			(In millions)	Life (Years)		Price	(In millions)		Price
$	27.35	-	$	41.02	3	3	$	38.09	1	$	36.52
$	41.03	-	$	54.70	1	1		45.99	1		46.36
$	54.71	-	$	68.37	3	4		63.01	2		61.20
$	68.38	-	$	84.41	1	6		83.04	0		74.57
					8				4

Stock Option Activity

					Weighted-
					Average
				Weighted-	Remaining		Aggregate
				Average Exercise	Contractual		Intrinsic
(In millions, except per share data and years)	Shares			Price	Term (Years)		Value (2)
Outstanding, March 31, 2009	19		$	39.28	3	$	33
Granted	2			40.59
Exercised	(5	)		33.34
Outstanding, March 31, 2010	16		$	41.26	3	$	394
Granted	1			67.95
Exercised	(8	)		37.63
Outstanding, March 31, 2011	9		$	49.01	4	$	269
Granted	1			83.30
Exercised	(2	)		42.20
Outstanding, March 31, 2012	8		$	56.88	4	$	226
Vested and expected to vest (1)	7		$	56.71	4	$	225
Vested and exercisable, March 31, 2012	4			49.86	3		142

(1) The number of options expected to vest takes into account an estimate of expected forfeitures.

(2) The intrinsic value is calculated as the difference between the period-end market price of the Company's common stock and the exercise price of "in-the-money" options.

Data Related To Stock Option Activity

	Years Ended March 31,
(In millions, except per share data and years)		2012		2011		2010
Weighted-average grant date fair value per stock option $		20.32	$	18.37	$	12.56
Aggregate intrinsic value on exercise	$	108	$	276	$	115
Cash received upon exercise	$	113	$	319	$	165
Tax benefits realized related to exercise	$	40	$	106	$	37
Total fair value of stock options vested	$	23	$	21	$	16
Total compensation cost, net of estimated forfeitures,
related to unvested stock options not yet recognized,
pre-tax	$	40	$	41	$	37
Weighted-average period in years over which stock
option compensation cost is expected to be recognized		1		1		1

RSU Activity

				Weighted-
				Average
				Grant Date Fair
(In millions, except per share data)	Shares			Value Per Share
Nonvested, March 31, 2009	3		$	54.70
Granted	2			40.94
Vested	(1	)		50.42
Nonvested, March 31, 2010	4		$	49.21
Granted	3			67.84
Vested	(1	)		61.05
Nonvested, March 31, 2011	6		$	57.79
Granted	2			82.71
Vested	(1	)		57.95
Nonvested, March 31, 2012	7		$	65.14

Data Related To RSU Activity

	Years Ended March 31,
(Dollars in millions)		2012		2011		2010
Total fair value of shares vested	$	44	$	43	$	74
Total compensation cost, net of estimated forfeitures,
related to nonvested RSU awards not yet recognized,
pre-tax	$	143	$	131	$	61
Weighted-average period in years over which RSU cost
is expected to be recognized		3		2		2