Stock-Based Compensation (Tables)

6 Months Ended

12 Months Ended

Jul. 31, 2011

Jan. 31, 2011

Schedule Of Stock-Based Compensation Expenses

	Six Months Ended July  31
	2011			2010
	(in millions)
Stock options	$	10		$	11
Vesting stock awards		35			36
Performance-based stock awards		(2	)		3
Total stock-based compensation expense	$	43		$	50

Schedule Of Weighted Average Grant-Date Fair Value And Assumptions Used

	Six Months Ended July  31
	2011			2010
Weighted average grant-date fair value	$	4.21		$	3.96
Expected term (in years)		4.9			3.8
Expected volatility		23.4	%		25.1	%
Risk-free interest rate		2.2	%		2.1	%
Dividend yield		0	%		0	%

Schedule Of Stock Option Activity

	Shares of stock under stock options			Weighted average exercise price		Weighted average remaining contractual term		Aggregate intrinsic value
	(in millions)					(in years)		(in millions)
Outstanding at January 31, 2011		25.0		$	17.31		2.1	$	11
Options granted		3.9			16.92
Options forfeited or expired		(2.0	)		15.94
Options exercised		(4.4	)		14.69				8
Outstanding at July 31, 2011		22.5			17.88		2.6		—
Exercisable at July 31, 2011		10.3			18.09		1.6		—

	Shares of stock under stock options			Weighted average exercise price		Weighted average remaining contractual term		Aggregate intrinsic value
	(in millions)					(in years)		(in millions)
Outstanding at January 31, 2008		53.5		$	13.41		2.1	$	294
Options granted		6.1			18.78
Options forfeited or expired		(3.2	)		13.27
Options exercised		(16.5	)		11.38				132
Outstanding at January 31, 2009		39.9			15.08		2.1		186
Options granted		5.5			18.41
Options forfeited or expired		(3.0	)		15.57
Options exercised		(10.8	)		13.22				57
Outstanding at January 31, 2010		31.6			16.26		2.0		66
Options granted		5.3			17.43
Options forfeited or expired		(2.8	)		16.14
Options exercised		(9.1	)		14.08				36
Outstanding at January 31, 2011		25.0			17.31		2.1		11
Vested and expected to vest in the future as of January 31, 2011		23.6			17.28		2.0		11

Schedule Of Vesting Stock Award Activity

	Shares of stock under stock awards			Weighted average grant- date fair value
	(in millions)
Unvested stock awards at January 31, 2011		11.7		$	18.03
Awards granted		5.6			16.91
Awards forfeited		(0.7	)		17.81
Awards vested		(3.6	)		17.93
Unvested stock awards at July 31, 2011		13.0			17.58

Schedule Of Performance Based Stock Award Activity

	Expected number of shares of stock to be issued under performance- based stock awards			Weighted average grant- date fair value
	(in millions)
Outstanding at January 31, 2011		1.0		$	17.89
Awards granted		0.5			16.92
Adjustments to expected number of shares of stock to be issued		(0.3	)		18.33
Outstanding at July 31, 2011		1.2			17.32

Schedule of Stock-Based Compensation and Related Tax Benefits Recognized

	Year Ended January 31
	2011		2010		2009
	(in millions)
Stock-based compensation expense:
Stock options	$	19	$	30	$	28
Vesting stock awards		75		69		62
Vested stock awards		1		1		1
Performance-based stock awards		5		3		—
Total stock-based compensation expense recorded in continuing operations	$	100	$	103	$	91
Total stock-based compensation expense recorded in discontinued operations	$	2	$	3	$	3
Tax benefits recognized from stock-based compensation	$	40	$	41	$	37
Vested stock issued as settlement of annual bonus accruals	$	4	$	3	$	3

Schedule of Assumptions for Valuation of Stock Options

	Year Ended January 31
	2011			2010			2009
Weighted average grant-date fair value	$	3.96		$	4.79		$	4.52
Expected term (in years)		3.8			3.9			3.9
Expected volatility		25.1	%		30.6	%		26.2	%
Risk-free interest rate		2.1	%		1.5	%		2.3	%
Dividend yield		0	%		0	%		0	%

Schedule of Cash Proceeds Received from Share-based Payment Awards

	Year Ended January 31
	2011		2010		2009
	(in millions)
Cash received from exercises of stock options	$	6	$	17	$	31
Stock exchanged at fair value upon exercises of stock options		41		116		156
Tax benefits realized from exercises of stock options		17		24		54

Schedule of the Options Outstanding

Range of exercise prices	Stock options outstanding		Weighted average exercise price		Weighted average remaining contractual term		Stock options exercisable		Weighted average exercise price		Weighted average remaining contractual term
	(in millions)				(in years)		(in millions)				(in years)
$14.50 to $16.00		5.9	$	14.73		0.2		5.9	$	14.72		0.2
$16.01 to $17.50		4.7		17.42		4.2		—		—		—
$17.51 to $19.00		14.0		18.28		2.2		5.8		18.19		1.9
$19.01 to $21.00		0.4		20.11		2.2		0.2		20.08		2.2
		25.0		17.31		2.1		11.9		16.51		1.0

Vesting Stock Awards [Member]

Schedule Of Vesting Stock Award Activity

	Shares of stock under stock awards			Weighted average grant- date fair value
	(in millions)
Unvested at January 31, 2010		12.1		$	18.60
Awards granted		4.5			17.38
Awards forfeited		(1.3	)		18.11
Awards vested		(3.6	)		19.13
Unvested at January 31, 2011		11.7			18.03

Performance-Based Stock Awards [Member]

Schedule Of Vesting Stock Award Activity

	Expected number of shares of stock to be issued under performance- based stock awards			Weighted average grant- date fair value
	(in millions)
Outstanding at January 31, 2010		0.6		$	18.35
Awards granted		0.6			17.45
Awards forfeited		(0.2	)		18.01
Outstanding at January 31, 2011		1.0			17.89