Condensed Consolidating Financial Statements (Details 4) - USD ($) $ in Millions	12 Months Ended
	May 31, 2016	May 31, 2015	May 31, 2014
Condensed Cash Flow Statements Captions [Line Items]
Net Cash Provided By Used In Operating Activities Continuing Operations	$ 5,708	$ 5,366	$ 4,264
Investing Activities:
Capital expenditures	(4,818)	(4,347)	(3,533)
Business acquisitions, net of cash acquired	(4,618)	(1,429)	(36)
Proceeds from asset dispositions and other	(10)	24	18
Cash used in investing activities	(9,446)	(5,752)	(3,551)
Financing Activities:
Principal payments on debt	(41)	(5)	(254)
Proceeds from debt issuance	6,519	2,491	1,997
Proceeds from stock issuances	183	320	557
Excess tax benefit on the exercise of stock options	3	51	44
Dividends paid	(277)	(227)	(187)
Purchase of treasury stock	(2,722)	(1,254)	(4,857)
Other, net	(54)	(27)	(19)
Cash provided by (used in) financing activities	3,611	1,349	(2,719)
Effect of exchange rate changes on cash	(102)	(108)	(3)
Net increase (decrease) in cash and cash equivalents	(229)	855	(2,009)
Cash and cash equivalents at beginning of period	3,763	2,908	4,917
Cash and cash equivalents at end of period	3,534	3,763	2,908
Parent Company [Member]
Condensed Cash Flow Statements Captions [Line Items]
Net Cash Provided By Used In Operating Activities Continuing Operations	(831)	(727)	(8)
Investing Activities:
Capital expenditures		(1)	(1)
Business acquisitions, net of cash acquired		(1,429)
Proceeds from asset dispositions and other	(55)
Cash used in investing activities	(55)	(1,430)	(1)
Financing Activities:
Net transfers from (to) Parent	1,629	1,431	588
Payment on loan between subsidiaries	(4,805)
Principal payments on debt			(250)
Proceeds from debt issuance	6,519	2,491	1,997
Proceeds from stock issuances	183	320	557
Excess tax benefit on the exercise of stock options	3	51	44
Dividends paid	(277)	(227)	(187)
Purchase of treasury stock	(2,722)	(1,254)	(4,857)
Other, net	(54)	(27)	(19)
Cash provided by (used in) financing activities	476	2,785	(2,127)
Effect of exchange rate changes on cash	1	(1)
Net increase (decrease) in cash and cash equivalents	(409)	627	(2,136)
Cash and cash equivalents at beginning of period	2,383	1,756	3,892
Cash and cash equivalents at end of period	1,974	2,383	1,756
Guarantor Subsidiaries [Member]
Condensed Cash Flow Statements Captions [Line Items]
Net Cash Provided By Used In Operating Activities Continuing Operations	5,932	5,446	3,790
Investing Activities:
Capital expenditures	(4,617)	(4,139)	(3,230)
Business acquisitions, net of cash acquired			(36)
Proceeds from asset dispositions and other	33	42	37
Cash used in investing activities	(4,584)	(4,097)	(3,229)
Financing Activities:
Net transfers from (to) Parent	(1,549)	(1,502)	(546)
Payment on loan between subsidiaries	109	267	(4)
Intercompany dividends	20	68	54
Principal payments on debt	(19)	(1)	(4)
Other, net	(48)	(105)	(16)
Cash provided by (used in) financing activities	(1,487)	(1,273)	(516)
Effect of exchange rate changes on cash	(22)	(30)	(9)
Net increase (decrease) in cash and cash equivalents	(161)	46	36
Cash and cash equivalents at beginning of period	487	441	405
Cash and cash equivalents at end of period	326	487	441
Non Guarantor Subsidiaries [Member]
Condensed Cash Flow Statements Captions [Line Items]
Net Cash Provided By Used In Operating Activities Continuing Operations	572	575	535
Investing Activities:
Capital expenditures	(201)	(207)	(302)
Business acquisitions, net of cash acquired	(4,618)
Proceeds from asset dispositions and other	12	(18)	(19)
Cash used in investing activities	(4,807)	(225)	(321)
Financing Activities:
Net transfers from (to) Parent	(80)	71	(42)
Payment on loan between subsidiaries	4,696	(267)	4
Intercompany dividends	(20)	(68)	(54)
Principal payments on debt	(22)	(4)
Other, net	48	105	16
Cash provided by (used in) financing activities	4,622	(163)	(76)
Effect of exchange rate changes on cash	(81)	(77)	6
Net increase (decrease) in cash and cash equivalents	306	110	144
Cash and cash equivalents at beginning of period	971	861	717
Cash and cash equivalents at end of period	1,277	971	861
Consolidation Eliminations [Member]
Condensed Cash Flow Statements Captions [Line Items]
Net Cash Provided By Used In Operating Activities Continuing Operations	35	72	(53)
Financing Activities:
Net increase (decrease) in cash and cash equivalents	35	72	(53)
Cash and cash equivalents at beginning of period	(78)	(150)	(97)
Cash and cash equivalents at end of period	$ (43)	$ (78)	$ (150)