Condensed Consolidated Statements Of Comprehensive Income (Unaudited) (Parenthetical) (USD $) In Millions, unless otherwise specified	3 Months Ended	9 Months Ended
Oct. 31, 2011	Oct. 31, 2010	Oct. 31, 2011	Oct. 31, 2010
Condensed Consolidated Statements Of Comprehensive Income (Unaudited) [Abstract]
Consolidated net income, redeemable noncontrolling interest	$ 11	$ 4	$ 40	$ 6
Foreign currency translation, redeemable noncontrolling interest	$ (64)	$ 42	$ (60)	$ 71

The portion of net income or loss for the period attributable to redeemable noncontrolling interest (if any) deducted in order to derive the portion attributable to the parent. This element should be used for redeemable noncontrolling interests that are classified within temporary equity.

No definition available.

Name:	us-gaap_NetIncomeLossAttributableToRedeemableNoncontrollingInterest
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration