Consolidated Statements of Cash Flows (USD $) In Millions, unless otherwise specified	12 Months Ended
	May 31, 2013	May 31, 2012	May 31, 2011
Operating Activities:
Net income	$ 1,561	$ 2,032	$ 1,452
Adjustments to reconcile net income to cash provided by operating activities:
Depreciation and amortization	2,386	2,113	1,973
Provision for uncollectible accounts	167	160	152
Deferred income taxes and other noncash items	521	1,126	669
Business realignment, impairment and other charges	479	134	29
Stock-based compensation	109	105	98
Changes in assets and liabilities:
Receivables	(451)	(254)	(400)
Other current assets	257	(231)	(114)
Pension assets and liabilities, net	(335)	(453)	(169)
Accounts payable and other liabilities	10	144	370
Other, net	(16)	(41)	(19)
Cash provided by operating activities	4,688	4,835	4,041
Investing Activities:
Capital expenditures	(3,375)	(4,007)	(3,434)
Business acquisitions, net of cash acquired	(483)	(116)	(96)
Proceeds from asset dispositions and other	55	74	111
Cash used in investing activities	(3,803)	(4,049)	(3,419)
Financing Activities:
Principal payments on debt	(417)	(29)	(262)
Proceeds from debt issuance	1,739
Proceeds from stock issuances	280	128	108
Excess tax benefit on the exercise of stock options	23	18	23
Dividends paid	(177)	(164)	(151)
Purchase of treasury stock	(246)	(197)
Other, net	(18)		(5)
Cash provided by (used in) financing activities	1,184	(244)	(287)
Effect of exchange rate changes on cash	5	(27)	41
Net increase (decrease) in cash and cash equivalents	2,074	515	376
Cash and cash equivalents at beginning of period	2,843	2,328	1,952
Cash and cash equivalents at end of period	$ 4,917	$ 2,843	$ 2,328