Earning Per Share And Stock Issuances - Additional Information (Detail) (USD $) In Millions, unless otherwise specified	6 Months Ended
May 31, 2012
Earnings Per Share [Line Items]
Remaining authorized shares repurchase amount	$ 201
Authorized shares repurchase amount	$ 400

The remaining repurchase amount authorized by an entity's Board of Directors under a stock repurchase plan.

No definition available.

Name:	us-gaap_StockRepurchaseProgramRemainingAuthorizedRepurchaseAmount
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration