Condensed Consolidating Financial Statements (Details 4) - USD ($) $ in Millions	3 Months Ended
	Aug. 31, 2016	Aug. 31, 2015
Condensed Financial Statements Captions [Line Items]
Net Cash Provided by (Used in) Operating Activities, Continuing Operations	$ 971	$ 1,241
Investing Activities:
Capital expenditures	(1,215)	(1,209)
Proceeds from asset dispositions and other	9	10
Cash used in investing activities	(1,206)	(1,199)
Financing Activities:
Principal payments on debt	(12)	(15)
Proceeds from stock issuances	40	46
Excess tax benefit on the exercise of stock options	2	6
Dividends paid	(106)	(71)
Purchases of treasury stock	(222)	(190)
Other, net	(15)
Cash used in financing activities	(313)	(224)
Effect of exchange rate changes on cash	3	(38)
Net decrease in cash and cash equivalents	(545)	(220)
Cash and cash equivalents at beginning of period	3,534	3,763
Cash and cash equivalents at end of period	2,989	3,543
Parent Company Member
Condensed Financial Statements Captions [Line Items]
Net Cash Provided by (Used in) Operating Activities, Continuing Operations	(342)	(397)
Investing Activities:
Proceeds from asset dispositions and other		(5)
Cash used in investing activities		(5)
Financing Activities:
Net transfers from (to) Parent	(35)	452
Payment on loan between subsidiaries	(2)
Proceeds from stock issuances	40	46
Excess tax benefit on the exercise of stock options	2	6
Dividends paid	(106)	(71)
Purchases of treasury stock	(222)	(190)
Other, net	(1)
Cash used in financing activities	(324)	243
Net decrease in cash and cash equivalents	(666)	(159)
Cash and cash equivalents at beginning of period	1,974	2,383
Cash and cash equivalents at end of period	1,308	2,224
Guarantor Subsidiaries Member
Condensed Financial Statements Captions [Line Items]
Net Cash Provided by (Used in) Operating Activities, Continuing Operations	1,119	1,533
Investing Activities:
Capital expenditures	(1,111)	(1,170)
Proceeds from asset dispositions and other	9	15
Cash used in investing activities	(1,102)	(1,155)
Financing Activities:
Net transfers from (to) Parent	(2)	(479)
Payment on loan between subsidiaries	(14)	98
Intercompany dividends		4
Principal payments on debt	(7)	(2)
Other, net	(1)	(25)
Cash used in financing activities	(24)	(404)
Effect of exchange rate changes on cash	8	(15)
Net decrease in cash and cash equivalents	1	(41)
Cash and cash equivalents at beginning of period	326	487
Cash and cash equivalents at end of period	327	446
Non Guarantor Subsidiaries Member
Condensed Financial Statements Captions [Line Items]
Net Cash Provided by (Used in) Operating Activities, Continuing Operations	188	71
Investing Activities:
Capital expenditures	(104)	(39)
Cash used in investing activities	(104)	(39)
Financing Activities:
Net transfers from (to) Parent	37	27
Payment on loan between subsidiaries	16	(98)
Intercompany dividends		(4)
Principal payments on debt	(5)	(13)
Other, net	(13)	25
Cash used in financing activities	35	(63)
Effect of exchange rate changes on cash	(5)	(23)
Net decrease in cash and cash equivalents	114	(54)
Cash and cash equivalents at beginning of period	1,277	971
Cash and cash equivalents at end of period	1,391	917
Consolidation Eliminations Member
Condensed Financial Statements Captions [Line Items]
Net Cash Provided by (Used in) Operating Activities, Continuing Operations	6	34
Financing Activities:
Net decrease in cash and cash equivalents	6	34
Cash and cash equivalents at beginning of period	(43)	(78)
Cash and cash equivalents at end of period	$ (37)	$ (44)