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Acquisitions, Investments And Disposals (Disposals Narrative) (Details) (USD $)	12 Months Ended
	Jan. 31, 2012	Jan. 31, 2011
Business Combinations [Abstract]
Tax benefit recorded in discontinued operations		$ 1,000,000,000
Discontinued operation of tax and interest expense	$ 67,000,000

Tax benefit from provision recognizing a loss for initial, or subsequent, write-down to fair value (less cost to sell) of a of a disposal group that is classified as a component of the entity, which remains unsold as of the reporting date. May include a tax on the (gain) for the recognition of a subsequent increase in fair value (less cost to sell), but not in excess of the cumulative loss previously recognized through write-downs.

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