Condensed Consolidating Financial Statements (Details 4) (USD $) In Millions, unless otherwise specified	3 Months Ended	9 Months Ended
	Feb. 28, 2015	Feb. 28, 2015	Feb. 28, 2014
Condensed Financial Statements Captions [Line Items]
Cash provided by (used in) operating activities		$ 3,473	$ 2,578
Investing Activities:
Capital expenditures		(2,969)	(2,554)
Business acquisitions, net of cash acquired		(1,429)
Proceeds from asset dispositions and other		16	23
Cash used in investing activities		(4,382)	(2,531)
Financing Activities:
Principal payments on debt		(1)	(254)
Proceeds from debt issuances		2,491	1,997
Proceeds from stock issuances		272	462
Excess tax benefit on the exercise of stock options		31	27
Dividends paid		(171)	(142)
Purchase of treasury stock	(69)	(1,016)	(3,984)
Other, net		(23)	(18)
Cash provided by (used in) financing activities		1,583	(1,912)
Effect of exchange rate changes on cash		(104)	(10)
Net increase (decrease) in cash and cash equivalents		570	(1,875)
Cash and cash equivalents at beginning of period		2,908	4,917
Cash and cash equivalents at end of period	3,478	3,478	3,042
Parent Company Member
Condensed Financial Statements Captions [Line Items]
Cash provided by (used in) operating activities		(460)	(104)
Investing Activities:
Capital expenditures		(1)
Business acquisitions, net of cash acquired		(1,429)
Cash used in investing activities		(1,430)
Financing Activities:
Net transfers from (to) Parent		692	136
Principal payments on debt			(250)
Proceeds from debt issuances		2,491	1,997
Proceeds from stock issuances		272	462
Excess tax benefit on the exercise of stock options		31	27
Dividends paid		(171)	(142)
Purchase of treasury stock		(1,016)	(3,984)
Other, net		(23)	(18)
Cash provided by (used in) financing activities		2,276	(1,772)
Net increase (decrease) in cash and cash equivalents		386	(1,876)
Cash and cash equivalents at beginning of period		1,756	3,892
Cash and cash equivalents at end of period	2,142	2,142	2,016
Guarantor Subsidiaries Member
Condensed Financial Statements Captions [Line Items]
Cash provided by (used in) operating activities		3,443	2,386
Investing Activities:
Capital expenditures		(2,849)	(2,342)
Proceeds from asset dispositions and other		35	26
Cash used in investing activities		(2,814)	(2,316)
Financing Activities:
Net transfers from (to) Parent		(681)	(123)
Payment on loan between subsidiaries		202	5
Intercompany dividends		38	36
Principal payments on debt		(1)	(4)
Other, net		(105)
Cash provided by (used in) financing activities		(547)	(86)
Effect of exchange rate changes on cash		(31)	(9)
Net increase (decrease) in cash and cash equivalents		51	(25)
Cash and cash equivalents at beginning of period		441	405
Cash and cash equivalents at end of period	492	492	380
Non Guarantor Subsidiaries Member
Condensed Financial Statements Captions [Line Items]
Cash provided by (used in) operating activities		382	341
Investing Activities:
Capital expenditures		(119)	(212)
Proceeds from asset dispositions and other		(19)	(3)
Cash used in investing activities		(138)	(215)
Financing Activities:
Net transfers from (to) Parent		(11)	(13)
Payment on loan between subsidiaries		(202)	(5)
Intercompany dividends		(38)	(36)
Other, net		105
Cash provided by (used in) financing activities		(146)	(54)
Effect of exchange rate changes on cash		(73)	(1)
Net increase (decrease) in cash and cash equivalents		25	71
Cash and cash equivalents at beginning of period		861	717
Cash and cash equivalents at end of period	886	886	788
Consolidation Eliminations Member
Condensed Financial Statements Captions [Line Items]
Cash provided by (used in) operating activities		108	(45)
Financing Activities:
Net increase (decrease) in cash and cash equivalents		108	(45)
Cash and cash equivalents at beginning of period		(150)	(97)
Cash and cash equivalents at end of period	$ (42)	$ (42)	$ (142)