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Long-Term Debt - Narrative (Detail) - 12 months ended May 31, 2018 | USD ($) | JPY (¥)
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2.6% and 2.0% Japanese Yen note, maturing August 20, 2001 through November 20, 2020 |  |
Debt Instrument [Line Items] |  |
Long-term debt, original principal | ¥ |  | ¥ 13,000,000,000
Corporate Bond Payables |  |
Debt Instrument [Line Items] |  |
Percent of aggregate principal amount of the notes to be redeemed | 100.00% |
Corporate Bond Payables | 2.25% Corporate bond, payable May 1, 2023 |  |
Debt Instrument [Line Items] |  |
Long-term debt, original principal | $ | $ 500,000,000 |
Corporate Bond Payables | 3.63% Corporate bond, payable May 1, 2043 |  |
Debt Instrument [Line Items] |  |
Long-term debt, original principal | $ | 500,000,000 |
Corporate Bond Payables | 3.88% Corporate bond, payable November 1, 2045 |  |
Debt Instrument [Line Items] |  |
Long-term debt, original principal | $ | $ 1,000,000,000 |
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
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

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- Definition Percentage price of original principal amount of debt at which debt can be redeemed by the issuer. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 470 -Section 50 -Paragraph 3 -Subparagraph e -URI http://asc.fasb.org/extlink&oid=75038535&loc=d3e64711-112823 + Details
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