Condensed Consolidating Financial Statements (Details 4) (USD $) In Millions, unless otherwise specified	6 Months Ended
	Nov. 30, 2011	Nov. 30, 2010
Condensed Financial Statements Captions [Line Items]
Cash provided by operating activities	$ 2,168	$ 2,011
Investing Activities:
Capital expenditures	(2,217)	(2,059)
Business acquisition, net of cash acquired	(114)
Proceeds from asset dispositions and other	15	7
Cash used in investing activities	(2,316)	(2,052)
Financing Activities:
Principal payments on debt	(18)	(12)
Proceeds from stock issuances	32	25
Excess tax benefit on the exercise of stock options	5	4
Dividends paid	(82)	(76)
Purchase of treasury stock	(197)
Cash used in financing activities	(260)	(59)
Effect of exchange rate changes on cash	(24)	25
Net decrease in cash and cash equivalents	(432)	(75)
Cash and cash equivalents at beginning of period	2,328	1,952
Cash and cash equivalents at end of period	1,896	1,877
Parent Company Member
Condensed Financial Statements Captions [Line Items]
Cash provided by operating activities	135	(6)
Investing Activities:
Capital expenditures	(1)	(1)
Cash used in investing activities	(1)	(1)
Financing Activities:
Net transfers from (to) Parent	(481)	(94)
Proceeds from stock issuances	32	25
Excess tax benefit on the exercise of stock options	5	4
Dividends paid	(82)	(76)
Purchase of treasury stock	(197)
Cash used in financing activities	(723)	(141)
Net decrease in cash and cash equivalents	(589)	(148)
Cash and cash equivalents at beginning of period	1,589	1,310
Cash and cash equivalents at end of period	1,000	1,162
Guarantor Subsidiaries Member
Condensed Financial Statements Captions [Line Items]
Cash provided by operating activities	1,814	1,755
Investing Activities:
Capital expenditures	(2,161)	(1,968)
Proceeds from asset dispositions and other	15	6
Cash used in investing activities	(2,146)	(1,962)
Financing Activities:
Net transfers from (to) Parent	484	100
Payment on loan between subsidiaries		113
Intercompany dividends	21	5
Principal payments on debt	(18)	(12)
Other, net	(16)
Cash used in financing activities	471	206
Effect of exchange rate changes on cash	(6)	11
Net decrease in cash and cash equivalents	133	10
Cash and cash equivalents at beginning of period	279	258
Cash and cash equivalents at end of period	412	268
Non Guarantor Subsidiaries Member
Condensed Financial Statements Captions [Line Items]
Cash provided by operating activities	248	259
Investing Activities:
Capital expenditures	(55)	(90)
Business acquisition, net of cash acquired	(114)
Proceeds from asset dispositions and other		1
Cash used in investing activities	(169)	(89)
Financing Activities:
Net transfers from (to) Parent	(3)	(6)
Payment on loan between subsidiaries		(113)
Intercompany dividends	(21)	(5)
Other, net	16
Cash used in financing activities	(8)	(124)
Effect of exchange rate changes on cash	(18)	14
Net decrease in cash and cash equivalents	53	60
Cash and cash equivalents at beginning of period	546	443
Cash and cash equivalents at end of period	599	503
Consolidation Eliminations Member
Condensed Financial Statements Captions [Line Items]
Cash provided by operating activities	(29)	3
Financing Activities:
Net decrease in cash and cash equivalents	(29)	3
Cash and cash equivalents at beginning of period	(86)	(59)
Cash and cash equivalents at end of period	$ (115)	$ (56)