Long-term Debt and Other Financing Arrangements - Components of Long-term Debt (Net of Discounts and Debt Issuance Costs) (Details) - USD ($) $ in Millions	May 31, 2017	May 31, 2016
Debt Instrument [Line Items]
Long Term Debt	$ 14,878	$ 13,687
Other debt	9	12
Capital lease obligations	44	63
Total Debt and Capital Lease Obligations	14,931	13,762
Less current portion	22	29
LONG-TERM DEBT, LESS CURRENT PORTION	14,909	13,733
Senior Unsecured Debt Due 2019 8.00% [Member]
Debt Instrument [Line Items]
Long Term Debt	749	748
Senior Unsecured Debt Due 2020 2.30% [Member]
Debt Instrument [Line Items]
Long Term Debt	398	397
Senior Unsecured Debt Due 2023 2.625-2.70% [Member]
Debt Instrument [Line Items]
Long Term Debt	745	745
Senior Unsecured Debt Due 2024 4.00% [Member]
Debt Instrument [Line Items]
Long Term Debt	745	744
Senior Unsecured Debt Due 2025 3.20% [Member]
Debt Instrument [Line Items]
Long Term Debt	695	694
Senior Unsecured Debt Due 2026 3.25% [Member]
Debt Instrument [Line Items]
Long Term Debt	743	743
Senior Unsecured Debt Due 2027 3.30% [Member]
Debt Instrument [Line Items]
Long Term Debt	445
Senior Unsecured Debt Issued 2034 4.90% [Member]
Debt Instrument [Line Items]
Long Term Debt	495	495
Senior Unsecured Debt Due 2035 3.90% [Member]
Debt Instrument [Line Items]
Long Term Debt	493	493
Senior Unsecured Debt Due 2043 3.875-4.10% [Member]
Debt Instrument [Line Items]
Long Term Debt	983	982
Senior Unsecured Debt Due 2044 5.10% [Member]
Debt Instrument [Line Items]
Long Term Debt	742	741
Senior Unsecured Debt Due 2045 4.10% [Member]
Debt Instrument [Line Items]
Long Term Debt	640	640
Senior Unsecured Debt Due 2046 4.55-4.75% [Member]
Debt Instrument [Line Items]
Long Term Debt	2,458	2,458
Senior Unsecured Debt Due 2047 4.40% [Member]
Debt Instrument [Line Items]
Long Term Debt	734
Senior Unsecured Debt Due 2065 4.50% [Member]
Debt Instrument [Line Items]
Long Term Debt	246	245
Senior Unsecured Debt Due 2098 7.60% [Member]
Debt Instrument [Line Items]
Long Term Debt	237	237
Euro Senior Unsecured Debt Due 2019 floating rate [Member]
Debt Instrument [Line Items]
Long Term Debt	558	557
Euro Senior Unsecured Debt Due 2020 0.50% [Member]
Debt Instrument [Line Items]
Long Term Debt	557	556
Euro Senior Unsecured Debt Due 2023 1.00% [Member]
Debt Instrument [Line Items]
Long Term Debt	833	832
Euro Senior Unsecured Debt Due 2027 1.625% [Member]
Debt Instrument [Line Items]
Long Term Debt	$ 1,382	$ 1,380

Amount equal to the present value (the principal) at the beginning of the lease term of minimum lease payments during the lease term (excluding that portion of the payments representing executory costs such as insurance, maintenance, and taxes to be paid by the lessor, together with any profit thereon) net of payments or other amounts applied to the principal through the balance sheet date.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 840
-SubTopic 30
-Section 50
-Paragraph 1
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=6455398&loc=d3e45280-112737

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(22))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.7-03(a)(16))
-URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910

+ Details

Name:	us-gaap_CapitalLeaseObligations
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Sum of the carrying values as of the balance sheet date of all debt, including all short-term borrowings, long-term debt, and capital lease obligations.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-03.13,16)
-URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.7-03.16)
-URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910

+ Details

Name:	us-gaap_DebtAndCapitalLeaseObligations
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

+ Details

Name:	us-gaap_DebtInstrumentLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

Amount, after unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.7-03(a)(16))
-URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-03(16))
-URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(22))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

+ Details

Name:	us-gaap_LongTermDebt
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Amount of long-term debt and capital lease obligation due after one year or beyond the normal operating cycle, if longer.

+ References

+ Details

Name:	us-gaap_LongTermDebtAndCapitalLeaseObligations
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Amount of long-term debt and capital leases due within one year or the normal operating cycle, if longer.

+ References

+ Details

Name:	us-gaap_LongTermDebtAndCapitalLeaseObligationsCurrent
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Amount of long-term debt classified as other.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(22))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-03(16))
-URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.7-03(a)(16))
-URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910

+ Details

Name:	us-gaap_OtherLongTermDebt
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant