Condensed Consolidating Statements of Cash Flows (Details) - USD ($) $ in Millions	3 Months Ended
	Aug. 31, 2017	Aug. 31, 2016
Condensed Financial Statements Captions [Line Items]
CASH PROVIDED BY (USED IN) OPERATING ACTIVITIES	$ 590	$ 971
Investing Activities:
Capital expenditures	(1,044)	(1,215)
Proceeds from asset dispositions and other	6	9
Cash used in investing activities	(1,038)	(1,206)
Financing Activities:
Principal payments on debt	(12)	(12)
Proceeds from stock issuances	150	40
Dividends paid	(134)	(106)
Purchase of treasury stock	(86)	(222)
Other, net	(6)	(13)
Cash used in financing activities	(88)	(313)
Effect of exchange rate changes on cash	70	3
Net decrease in cash and cash equivalents	(466)	(545)
Cash and cash equivalents at beginning of period	3,969	3,534
Cash and cash equivalents at end of period	3,503	2,989
Consolidation Eliminations [Member]
Condensed Financial Statements Captions [Line Items]
CASH PROVIDED BY (USED IN) OPERATING ACTIVITIES	7	6
Financing Activities:
Net decrease in cash and cash equivalents	7	6
Cash and cash equivalents at beginning of period	(47)	(43)
Cash and cash equivalents at end of period	(40)	(37)
Parent Company [Member]
Condensed Financial Statements Captions [Line Items]
CASH PROVIDED BY (USED IN) OPERATING ACTIVITIES	(878)	(342)
Financing Activities:
Net transfers from (to) Parent	744	(35)
Payment on loan between subsidiaries		(2)
Proceeds from stock issuances	150	40
Dividends paid	(134)	(106)
Purchase of treasury stock	(86)	(222)
Other, net	3	1
Cash used in financing activities	677	(324)
Effect of exchange rate changes on cash	(2)
Net decrease in cash and cash equivalents	(203)	(666)
Cash and cash equivalents at beginning of period	1,884	1,974
Cash and cash equivalents at end of period	1,681	1,308
Guarantor Subsidiaries [Member]
Condensed Financial Statements Captions [Line Items]
CASH PROVIDED BY (USED IN) OPERATING ACTIVITIES	1,717	1,119
Investing Activities:
Capital expenditures	(985)	(1,111)
Proceeds from asset dispositions and other	6	9
Cash used in investing activities	(979)	(1,102)
Financing Activities:
Net transfers from (to) Parent	(735)	(2)
Payment on loan between subsidiaries		(14)
Principal payments on debt	(8)	(7)
Other, net		(1)
Cash used in financing activities	(743)	(24)
Effect of exchange rate changes on cash	23	8
Net decrease in cash and cash equivalents	18	1
Cash and cash equivalents at beginning of period	325	326
Cash and cash equivalents at end of period	343	327
Non Guarantor Subsidiaries [Member]
Condensed Financial Statements Captions [Line Items]
CASH PROVIDED BY (USED IN) OPERATING ACTIVITIES	(256)	188
Investing Activities:
Capital expenditures	(59)	(104)
Cash used in investing activities	(59)	(104)
Financing Activities:
Net transfers from (to) Parent	(9)	37
Payment on loan between subsidiaries		16
Principal payments on debt	(4)	(5)
Other, net	(9)	(13)
Cash used in financing activities	(22)	35
Effect of exchange rate changes on cash	49	(5)
Net decrease in cash and cash equivalents	(288)	114
Cash and cash equivalents at beginning of period	1,807	1,277
Cash and cash equivalents at end of period	$ 1,519	$ 1,391