Condensed Consolidated Statements Of Comprehensive Income (Unaudited) (Parenthetical) (USD $) In Millions	3 Months Ended	6 Months Ended
Jul. 31, 2011	Jul. 31, 2010	Jul. 31, 2011	Jul. 31, 2010
Condensed Consolidated Statements Of Comprehensive Income (Unaudited)
Consolidated net income, redeemable noncontrolling interest	$ 12	$ 5	$ 29	$ 2
Foreign currency translation, redeemable noncontrolling interest	$ 21	$ 3	$ 4	$ 29

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