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Shareholder's Equity (Restricted Stock And Performance Share Awards) (Narrative) (Details) (USD $) In Millions, except Share data, unless otherwise specified	12 Months Ended
	Jan. 31, 2013	Jan. 31, 2012	Jan. 31, 2011	Jun. 04, 2010
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Common stock to be issued under the Plan	49,000,000			210,000,000
Share-based Compensation Expense	$ 378	$ 355	$ 371
Restricted Stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based Compensation Expense	195	184	157
Unrecognized compensation cost	437
Restricted Stock And Performance Share Awards [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based Compensation Expense	152	142	162
Unrecognized compensation cost	233
Stock Option [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based Compensation Expense	31	29	52
Unrecognized compensation cost	$ 21
Options granted vesting period, years	5 years
Maximum [Member] \| Restricted Stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Options granted vesting period, years	5 years
Maximum [Member] \| Restricted Stock And Performance Share Awards [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Vesting Percentage	150.00%
Options granted vesting period, years	5 years
Maximum [Member] \| Colleague Share Ownership Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Options granted vesting period, years	6 years
Minimum [Member] \| Restricted Stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Options granted vesting period, years	3 years
Minimum [Member] \| Restricted Stock And Performance Share Awards [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Vesting Percentage	0.00%
Options granted vesting period, years	3 years
Minimum [Member] \| Colleague Share Ownership Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Options granted vesting period, years	3 years

Represents the expense recognized during the period arising from equity-based compensation arrangements (for example, shares of stock, unit, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees.

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- Definition

The maximum number of shares (or other type of equity) originally approved (usually by shareholders and board of directors), net of any subsequent amendments and adjustments, for awards under the equity-based compensation plan. As stock or unit options and equity instruments other than options are awarded to participants, the shares or units remain authorized and become reserved for issuance under outstanding awards (not necessarily vested).

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