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Share-Based Compensation (Tables)
 12 Months Ended
Jan. 31, 2015
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Share-Based Compensation Expense
Share-based compensation expense is as follows:
  
 
Fiscal Year
($ in millions)
 
2014
 
2013
 
2012
Stock units
 
$
86

 
$
99

 
$
92

Stock options
 
9

 
12

 
17

Employee stock purchase plan
 
5

 
5

 
4

Share-based compensation expense
 
100

 
116

 
113

Less: Income tax benefit
 
(37
)
 
(45
)
 
(44
)
Share-based compensation expense, net of tax
 
$
63

 
$
71

 
$
69
Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions [Table Text Block]
The fair value of stock options issued during fiscal 2014, 2013, and 2012 was estimated on the date of grant using the following assumptions:
 
 
Fiscal Year
 
 
2014
 
2013
 
2012
Expected term (in years)
 
4.4

 
4.5

 
4.6

Expected volatility
 
27.3
%
 
31.5
%
 
33.6
%
Dividend yield
 
2.1
%
 
1.7
%
 
2.1
%
Risk-free interest rate
 
1.3
%
 
0.7
%
 
1.0
%
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Outstanding and Exercisable [Table Text Block]
Information about stock options outstanding, vested or expected to vest, and exercisable as of January 31, 2015 is as follows:
 
 
Options Outstanding
 
Options Exercisable
Range of Exercise Prices
 
Number of
Shares as of
January 31, 2015
 
Weighted-
Average
Remaining
Contractual
Life (in years)
 
Weighted-
Average
Exercise Price
 
Number of
Shares as of
January 31, 2015
 
Weighted-
Average
Exercise Price
$11.77 - $21.79
 
1,531,249

 
4.84
 
$
20.63

 
1,087,788

 
$
20.22

$22.25 - $25.09
 
1,048,257

 
6.31
 
$
24.63

 
406,831

 
$
24.03

$27.43 - $36.45
 
1,195,284

 
7.77
 
$
36.25

 
289,965

 
$
36.10

$36.87 - 42.12
 
128,300

 
9.02
 
$
39.94

 
12,849

 
$
39.15

$42.20 - $46.41
 
1,292,175

 
9.14
 
$
42.28

 
800

 
$
43.31

 
 
5,195,265

 
6.98
 
$
30.89

 
1,798,233

 
$
23.79

Vested or expected to vest as of January 31, 2015
 
4,913,907

 
6.89
 
$
30.46

 
 
 
 
Stock Options [Member]  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Schedule of Share-based Compensation, Stock Options, Activity [Table Text Block]
A summary of stock option activity under the 2011 Plan and the 2002 Plan for fiscal 2014 is as follows:
 
 
Shares
 
Weighted-
Average
Exercise Price
Balance as of February 1, 2014
 
7,399,822

 
$
24.89

Granted
 
1,556,625

 
$
42.18

Exercised
 
(2,892,590
)
 
$
21.35

Forfeited/Expired
 
(868,592
)
 
$
31.69

Balance as of January 31, 2015
 
5,195,265

 
$
30.89
Additional Information About Stock Unit Activity [Table Text Block]
A summary of additional information about stock options is as follows: 
 
 
Fiscal Year
 
 
2014
 
2013
 
2012
Weighted-average fair value per share of stock options granted
 
$
8.20

 
$
8.25

 
$
6.35

Aggregate intrinsic value of stock options exercised (in millions)
 
$
63

 
$
125

 
$
94

Fair value of stock options vested (in millions)
 
$
10

 
$
14

 
$
15
Stock Units [Member]  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Schedule of Share-based Compensation, Stock Options, Activity [Table Text Block]
A summary of Stock Unit activity under the 2011 Plan for fiscal 2014 is as follows:
 
 
Shares
 
Weighted-Average
Grant-Date
Fair Value
Balance as of February 1, 2014
 
8,660,635

 
$
28.25

Granted
 
1,994,936

 
$
39.88

Granted, with vesting subject to performance conditions
 
1,314,252

 
$
40.67

Vested
 
(4,305,360
)
 
$
26.47

Forfeited
 
(2,017,985
)
 
$
38.28

Balance as of January 31, 2015
 
5,646,478

 
$
33.02
Additional Information About Stock Unit Activity [Table Text Block]
A summary of additional information about Stock Units is as follows:
 
 
Fiscal Year
 
 
2014
 
2013
 
2012
Weighted-average fair value per share of Stock Units granted
 
$
40.20

 
$
36.15

 
$
24.95

Grant-date fair value of Stock Units vested (in millions)
 
$
114

 
$
63

 
$
50