Long-Term Debt - Net of Unamortized Premiums and Discounts and Swap Fair Value Adjustments (Detail)	12 Months Ended
May 31, 2018 USD ($)	May 31, 2018 JPY (¥)	May 31, 2017 USD ($)
Debt Instrument [Line Items]
Long Term Debt	$ 3,474,000,000		$ 3,477,000,000
Less current maturities	6,000,000		6,000,000
TOTAL LONG-TERM DEBT	3,468,000,000		3,471,000,000
Corporate Bond Payables \| 2.25% Corporate bond, payable May 1, 2023
Debt Instrument [Line Items]
Long-term debt, original principal	$ 500,000,000
Long-term debt, interest rate	2.25%	2.25%
Long-term debt, interest payment	Semi-Annually
Long Term Debt	$ 498,000,000		497,000,000
Corporate Bond Payables \| 2.38% Corporate bond, payable November 1, 2026
Debt Instrument [Line Items]
Long-term debt, original principal	$ 1,000,000,000
Long-term debt, interest rate	2.375%	2.375%
Long-term debt, interest payment	Semi-Annually
Long Term Debt	$ 994,000,000		993,000,000
Corporate Bond Payables \| 3.63% Corporate bond, payable May 1, 2043
Debt Instrument [Line Items]
Long-term debt, original principal	$ 500,000,000
Long-term debt, interest rate	3.625%	3.625%
Long-term debt, interest payment	Semi-Annually
Long Term Debt	$ 495,000,000		495,000,000
Corporate Bond Payables \| 3.88% Corporate bond, payable November 1, 2045
Debt Instrument [Line Items]
Long-term debt, original principal	$ 1,000,000,000
Long-term debt, interest rate	3.875%	3.875%
Long-term debt, interest payment	Semi-Annually
Long Term Debt	$ 982,000,000		981,000,000
Corporate Bond Payables \| 3.38% Corporate bond, payable November 1, 2046
Debt Instrument [Line Items]
Long-term debt, original principal	$ 500,000,000
Long-term debt, interest rate	3.375%	3.375%
Long-term debt, interest payment	Semi-Annually
Long Term Debt	$ 490,000,000		490,000,000
Notes Payable \| 2.60% Japanese Yen note, maturing August 20, 2001 through November 20, 2020
Debt Instrument [Line Items]
Long-term debt, original principal \| ¥		¥ 9,000,000,000
Long-term debt, interest rate	2.60%	2.60%
Long-term debt, interest payment	Quarterly
Long Term Debt	$ 10,000,000		14,000,000
Notes Payable \| 2.00% Japanese Yen note, maturing August 20, 2001 through November 20, 2020
Debt Instrument [Line Items]
Long-term debt, original principal \| ¥		¥ 4,000,000,000
Long-term debt, interest rate	2.00%	2.00%
Long-term debt, interest payment	Quarterly
Long Term Debt	$ 5,000,000		$ 7,000,000

Face (par) amount of debt instrument at time of issuance.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
-Section 55
-Paragraph 8
-URI http://asc.fasb.org/extlink&oid=64930739&loc=d3e28878-108400

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
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-Section 45
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Contractual interest rate for funds borrowed, under the debt agreement.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
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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.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
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-Section S99
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Amount, after unamortized (discount) premium and debt issuance costs, of long-term debt, classified as current. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

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Disclosure of timing of required repayments, sinking fund requirements, and other redeemable securities at fixed or determinable prices and dates in the five years immediately following the date of the latest balance sheet presented in the financial statements, and the amount thereafter to fully repay the principal of long-term debt. These disclosures may be made either on an individual debt or security basis, by type of debt or security basis, or on a combined basis.

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Amount after unamortized (discount) premium and debt issuance costs of long-term debt classified as noncurrent and excluding amounts to be repaid within one year or the normal operating cycle, if longer. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

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