Contingencies (Details) $ in Millions	12 Months Ended
May. 31, 2015 USD ($)
GainLossRelatedToLitigationSettlementAbstract
LitigationSettlementAmount	$ 228

Amount of judgment or settlement awarded to (against) the entity in respect of litigation.

No definition available.

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