Condensed Consolidated Statements of Cash Flows (USD $) In Millions, unless otherwise specified	6 Months Ended
Nov. 30, 2014	Nov. 30, 2013
Operating Activities:
Net income	$ 469us-gaap_NetIncomeLoss	$ 344us-gaap_NetIncomeLoss
Noncash charges:
Depreciation and amortization	736	736
Other, net	63us-gaap_OtherNoncashIncomeExpense	108us-gaap_OtherNoncashIncomeExpense
Changes in assets and liabilities. net	(149)	(76)
Cash provided by operating activities	1,119	1,112
Investing Activities:
Capital expenditures	(1,079)	(992)
Other	4	14
Cash used in investing activities	(1,075)	(978)
Financing Activities:
Principal payments on debt		(3)
Cash used in financing activities		(3)
Effect of exchange rate changes on cash	(54)	(2)
Net increase in cash and cash equivalents	(10)	129
Cash and cash equivalents at beginning of period	858	769
Cash and cash equivalents at end of period	$ 848	$ 898

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