Earnings Per Share and Stock Issuances-Additional Information (Details) (USD $) In Millions, unless otherwise specified	9 Months Ended
Aug. 31, 2012
Earnings Per Share, Basic and Diluted [Abstract]
Stock repurchase program, remaining authorized repurchase amount	$ 171
Stock repurchase program, authorized 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