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Acquisitions, Investments And Disposals (Net Income Or Losses Related To Discontinued Operations, Including Gain And (Losses) Upon Disposition) (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Jan. 31, 2013	Jan. 31, 2012	Jan. 31, 2011
Business Acquisition [Line Items]
Net income or losses related to discontinued operations, including gain and (losses) upon disposition	$ 0	$ (67)	$ 1,034
Germany [Member]
Business Acquisition [Line Items]
Net income or losses related to discontinued operations, including gain and (losses) upon disposition	0	(67)	1,041
Seiyu Ltd. [Member]
Business Acquisition [Line Items]
Net income or losses related to discontinued operations, including gain and (losses) upon disposition	$ 0	$ 0	$ (7)

Overall income (loss) from a disposal group that is classified as a component of the entity, before income tax, reported as a separate component of income before extraordinary items. Includes the following (before income tax): income (loss) from operations during the phase-out period, gain (loss) on disposal, provision (or any reversals of earlier provisions) for loss on disposal, and adjustments of a prior period gain (loss) on disposal.

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