Condensed Consolidating Statements of Cash Flows (Details) - USD ($) $ in Millions	12 Months Ended
	May 31, 2017	May 31, 2016	May 31, 2015
Condensed Cash Flow Statements Captions [Line Items]
CASH PROVIDED BY (USED IN) OPERATING ACTIVITIES	$ 4,930	$ 5,708	$ 5,366
INVESTING ACTIVITIES
Capital expenditures	(5,116)	(4,818)	(4,347)
Business acquisitions, net of cash acquired		(4,618)	(1,429)
Proceeds from asset dispositions and other	135	(10)	24
Cash used in investing activities	(4,981)	(9,446)	(5,752)
FINANCING ACTIVITIES
Principal payments on debt	(82)	(41)	(5)
Proceeds from debt issuances	1,190	6,519	2,491
Proceeds from stock issuances	337	183	320
Dividends paid	(426)	(277)	(227)
Purchase of treasury stock	(509)	(2,722)	(1,254)
Other, net	18	(51)	24
Cash provided by financing activities	528	3,611	1,349
Effect of exchange rate changes on cash	(42)	(102)	(108)
Net increase (decrease) in cash and cash equivalents	435	(229)	855
Cash and cash equivalents at beginning of period	3,534	3,763	2,908
Cash and cash equivalents at end of period	3,969	3,534	3,763
Consolidation Eliminations [Member]
Condensed Cash Flow Statements Captions [Line Items]
CASH PROVIDED BY (USED IN) OPERATING ACTIVITIES	(4)	35	72
FINANCING ACTIVITIES
Net increase (decrease) in cash and cash equivalents	(4)	35	72
Cash and cash equivalents at beginning of period	(43)	(78)	(150)
Cash and cash equivalents at end of period	(47)	(43)	(78)
Parent Company [Member]
Condensed Cash Flow Statements Captions [Line Items]
CASH PROVIDED BY (USED IN) OPERATING ACTIVITIES	(1,155)	(831)	(727)
INVESTING ACTIVITIES
Capital expenditures			(1)
Business acquisitions, net of cash acquired			(1,429)
Proceeds from asset dispositions and other	34	(55)
Cash used in investing activities	34	(55)	(1,430)
FINANCING ACTIVITIES
Net transfers from (to) Parent	421	1,629	1,431
Payment on loan between subsidiaries	41	(4,805)
Proceeds from debt issuances	1,190	6,519	2,491
Proceeds from stock issuances	337	183	320
Dividends paid	(426)	(277)	(227)
Purchase of treasury stock	(509)	(2,722)	(1,254)
Other, net	(12)	(51)	24
Cash provided by financing activities	1,042	476	2,785
Effect of exchange rate changes on cash	(11)	1	(1)
Net increase (decrease) in cash and cash equivalents	(90)	(409)	627
Cash and cash equivalents at beginning of period	1,974	2,383	1,756
Cash and cash equivalents at end of period	1,884	1,974	2,383
Guarantor Subsidiaries [Member[
Condensed Cash Flow Statements Captions [Line Items]
CASH PROVIDED BY (USED IN) OPERATING ACTIVITIES	5,254	5,932	5,446
INVESTING ACTIVITIES
Capital expenditures	(4,694)	(4,617)	(4,139)
Proceeds from asset dispositions and other	25	33	42
Cash used in investing activities	(4,669)	(4,584)	(4,097)
FINANCING ACTIVITIES
Net transfers from (to) Parent	(518)	(1,549)	(1,502)
Payment on loan between subsidiaries	(15)	109	267
Intercompany dividends	1	20	68
Principal payments on debt	(55)	(19)	(1)
Other, net	(13)	(48)	(105)
Cash provided by financing activities	(600)	(1,487)	(1,273)
Effect of exchange rate changes on cash	14	(22)	(30)
Net increase (decrease) in cash and cash equivalents	(1)	(161)	46
Cash and cash equivalents at beginning of period	326	487	441
Cash and cash equivalents at end of period	325	326	487
Non Guarantor Subsidiaries [Member]
Condensed Cash Flow Statements Captions [Line Items]
CASH PROVIDED BY (USED IN) OPERATING ACTIVITIES	835	572	575
INVESTING ACTIVITIES
Capital expenditures	(422)	(201)	(207)
Business acquisitions, net of cash acquired		(4,618)
Proceeds from asset dispositions and other	76	12	(18)
Cash used in investing activities	(346)	(4,807)	(225)
FINANCING ACTIVITIES
Net transfers from (to) Parent	97	(80)	71
Payment on loan between subsidiaries	(26)	4,696	(267)
Intercompany dividends	(1)	(20)	(68)
Principal payments on debt	(27)	(22)	(4)
Other, net	43	48	105
Cash provided by financing activities	86	4,622	(163)
Effect of exchange rate changes on cash	(45)	(81)	(77)
Net increase (decrease) in cash and cash equivalents	530	306	110
Cash and cash equivalents at beginning of period	1,277	971	861
Cash and cash equivalents at end of period	$ 1,807	$ 1,277	$ 971