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General (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended		6 Months Ended
	Nov. 30, 2014	Nov. 30, 2013	Nov. 30, 2014	Nov. 30, 2013	May 31, 2014
Long Term Debt [Abstract]
Long Term Debt Exclusive of Capital Leases Carrying Value	$ 239us-gaap_LongTermDebt		$ 239us-gaap_LongTermDebt		$ 239us-gaap_LongTermDebt
Long Term Debt Exclusive Of Capital Leases Fair Value	335us-gaap_LongTermDebtFairValue		335us-gaap_LongTermDebtFairValue		326us-gaap_LongTermDebtFairValue
Stock Based Compensation Details [Abstract]
Stock-based compensation	$ 10us-gaap_ShareBasedCompensation	$ 9us-gaap_ShareBasedCompensation	$ 26us-gaap_ShareBasedCompensation	$ 24us-gaap_ShareBasedCompensation

Carrying amount of long-term debt, net of unamortized discount or premium, including current and noncurrent amounts. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

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