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Income Taxes - Additional Information (Details) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
May 31, 2016 | May 31, 2017 | May 31, 2016 | May 31, 2015
Income Taxes [Line Items] |  |  |  |
Earnings From Foreign Operations |  | $ 919 | $ 905 | $ 773
Statutory Federal Income Tax Rate |  | 35.00% | 35.00% | 35.00%
Internal restructuring | $ 76 |  | $ 76 |
Permanently Reinvested Earnings of Foreign Subsidiaries |  | $ 2,100 | 1,600 |
Cash in Offshore Jurisdictions Associated With Permanent Reinvestment Strategy | 522 | 1,200 | 522 |
Unrecognized Tax Benefits That Would Impact Effective Tax Rate | 45 | 63 | 45 |
Unrecognized Tax Benefits Accrued Income Tax Penalties And Interest | $ 11 | $ 11 | $ 11 |
U.S. [Member] |  |  |  |
Income Taxes [Line Items] |  |  |  |
Percent Income Earned in Domestic Companies |  | 90.00% |  |
Foreign Country [Member] |  |  |  |
Income Taxes [Line Items] |  |  |  |
Operating Loss Carryforwards |  | $ 3,600 |  |
State And Local Jurisdiction [Member] |  |  |  |
Income Taxes [Line Items] |  |  |  |
Operating Loss Carryforwards |  | 663 |  |
Adoption of U.S. Foreign Currency Tax Regulations [Member] |  |  |  |
Income Taxes [Line Items] |  |  |  |
Impact on tax rate, amount |  | 62 |  |
Accounting Standards Update on Share-based Payments [Member] |  |  |  |
Income Taxes [Line Items] |  |  |  |
Impact on tax rate, amount |  | $ 55 |  |

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- Definition Amount of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to internal tax restructuring. + References No definition available. + Details
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- Definition The amount of unremitted earnings of foreign subsidiaries for which deferred taxes for U.S. federal income tax purposes have not been recognized as the unremitted earnings have been determined to be permanently reinvested in the foreign subsidiaries. + References No definition available. + Details
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- Definition Percentage of domestic federal statutory tax rate applicable to pretax income (loss). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=65882285&loc=d3e32687-109319 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB TOPIC 6.I) -URI http://asc.fasb.org/extlink&oid=34349781&loc=d3e330036-122817 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 13 -URI http://asc.fasb.org/extlink&oid=65882285&loc=d3e32698-109319 + Details
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