Condensed Consolidated Statements of Cash Flows (USD $) In Millions, unless otherwise specified	6 Months Ended
	Nov. 30, 2011	Nov. 30, 2010
Operating Activities:
Net income	$ 406	$ 364
Noncash charges:
Depreciation and amortization	564	515
Other, net	184	113
Changes in assets and liabilities, net	664	661
Cash provided by operating activities	1,818	1,653
Investing Activities:
Capital expenditures	(1,623)	(1,601)
Business acquisition, net of cash acquired	(114)
Other	3	5
Cash used in investing activities	(1,734)	(1,596)
Financing Activities:
Principal payments on debt	(17)	(12)
Cash used in financing activities	(17)	(12)
Effect of exchange rate changes on cash	(18)	24
Net increase in cash and cash equivalents	49	69
Cash and cash equivalents at beginning of period	626	512
Cash and cash equivalents at end of period	$ 675	$ 581