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Shareholder's Equity (Tables)
 12 Months Ended
Jan. 31, 2013
Stockholders' Equity Note [Abstract]  
Schedule Of Share-Based Compensation Expense
The following table summarizes the Company's share-based compensation expense by award type:
 
 
Fiscal Years Ended January 31,
(Amounts in millions)
 
2013
 
2012
 
2011
Restricted stock and performance share awards
 
$
152

 
$
142

 
$
162

Restricted stock rights
 
195

 
184

 
157

Stock options
 
31

 
29

 
52

Share-based compensation expense
 
$
378

 
$
355

 
$
371
Summary Of Stock Options Award Activity
The following table shows the activity for each award type during fiscal 2013:
 
 
Restricted Stock and Performance Share Awards
 
Restricted Stock Rights
 
Stock Options(1)
(Shares in thousands)
 
Shares
 
Weighted-
Average
Grant-Date
Fair Value
Per Share
 
Shares
 
Weighted-
Average
Grant-Date
Fair Value
Per Share
 
Shares
 
Weighted-
Average
Exercise Price
Per Share
Outstanding at February 1, 2012
 
13,320

 
$
53.56

 
17,621

 
$
47.76

 
20,152

 
$
48.21

Granted
 
4,488

 
62.13

 
5,262

 
53.27

 
2,082

 
47.39

Vested/exercised
 
(2,982
)
 
50.95

 
(3,714
)
 
45.35

 
(10,701
)
 
48.12

Forfeited or expired
 
(2,228
)
 
52.73

 
(1,330
)
 
48.37

 
(1,293
)
 
52.56

Outstanding at January 31, 2013
 
12,598

 
$
57.37

 
17,839

 
$
49.79

 
10,240

 
$
47.58

Exercisable at January 31, 2013
 


 


 
 
 


 
5,326

 
$
50.00

(1)  
Includes stock option awards granted under the Plan, the CSOP and the Sharesave Plan.
Schedule of Share-based Compensation, Restricted Stock and Restricted Stock Units Activity [Table Text Block]
The following table includes additional information related to restricted stock and performance share awards and restricted stock rights: 
 
 
Fiscal Years Ended January 31,
(Amounts in millions)
 
2013
 
2012
 
2011
Fair value of restricted stock and performance share awards vested
 
$
155

 
$
134

 
$
142

Fair value of restricted stock rights vested
 
168

 
178

 
50
Schedule Of Additional Information Related To Stock Option Awards
The following table includes additional information related to stock option awards: 
 
 
Fiscal Years Ended January 31,
(Amounts in millions)
 
2013
 
2012
 
2011
Fair value of stock options vested
 
$
33

 
$
50

 
$
54

Proceeds from stock options exercised
 
320

 
420

 
205

Intrinsic value of stock options exercised
 
207

 
91

 
51
Weighted-Average Assumptions To Estimate Fair Values
The following table provides the weighted-average assumptions used to estimate the fair values of the Company's stock options granted in fiscal 2013, 2012 and 2011:
 
 
Fiscal Years Ended January 31,
 
 
2013
 
2012
 
2011
Dividend yield(1)
 
2.8
%
 
2.9
%
 
2.3
%
Volatility(2)
 
16.2
%
 
17.6
%
 
17.1
%
Risk-free interest rate(3)
 
0.6
%
 
1.3
%
 
1.8
%
Expected life in years(4)
 
3.0

 
3.0

 
3.1

Weighted-average fair value of options granted
 
$
10.57

 
$
9.61

 
$
12.53

(1)
Expected dividend yield is based on the anticipated dividends over the vesting period.
(2)
Expected volatility is based on historical volatility of the Company's stock.
(3)
Risk-free interest rate is based on the U.S. Treasury yield curve at the time of the grant.
(4)
Expected life in years is based on historical exercise and expiration activity of grants with similar vesting periods.
Schedule Of Company's Share Repurchases
Cash paid for share repurchases during fiscal 2013, 2012 and 2011, was as follows:
Share Repurchases
 
Total Number of Shares Repurchased
(in millions)
 
Average Price Paid per Share
(in dollars)
 
Total Investment
(in billions)
Fiscal year ended January 31, 2013
 
113.2

 
$
67.15

 
$
7.6

Fiscal year ended January 31, 2012
 
115.3

 
54.64

 
6.3

Fiscal year ended January 31, 2011
 
279.1

 
53.03

 
14.8