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Income Taxes - Additional Information (Details) - USD ($) $ in Millions | 1 Months Ended | 3 Months Ended | 5 Months Ended | 7 Months Ended | 12 Months Ended
--- | --- | --- | --- | --- | ---
Feb. 28, 2018 | May 31, 2018 | Feb. 28, 2018 | Nov. 30, 2017 | May 31, 2018 | Dec. 31, 2017 | May 31, 2018 | May 31, 2017 | May 31, 2016
Income Taxes [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Earnings From Foreign Operations |  |  |  |  |  |  | $ 958 |  | $ 919 |  | $ 905 |
Statutory Federal Income Tax Rate |  |  |  |  | 21.00% | 35.00% | 29.20% |  | 35.00% |  | 35.00% |
Provisional benefit related to remeasurement of net U.S. deferred tax liability | $ (1,150) |  | $ (1,150) |  |  |  | $ (1,150) |  |  |  |  |
Income tax benefit related to lower statutory Income tax rate on earnings |  | $ 100 | 165 |  |  |  | 265 |  |  |  |  |
Tax benefit from corporate structuring transactions |  | (255) |  |  |  |  | 255 | [1] | $ 68 | [1] | $ 76 | [1]
Tax benefits from foreign tax credits |  | 133 | 12 | $ 80 |  |  | $ 225 |  |  |  |  |
Measurement period |  |  |  |  |  |  | 1 year |  |  |  |  |
Unrecognized Tax Benefits That Would Impact Effective Tax Rate |  | 142 |  |  | $ 142 |  | $ 142 |  | 63 |  |  |
Unrecognized Tax Benefits Accrued Income Tax Penalties And Interest |  | $ 35 |  |  | $ 35 |  | 35 |  | 11 |  |  |
Foreign Country [Member] |  |  |  |  |  |  |  |  |  |  |  |
Income Taxes [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Operating Loss Carryforwards |  |  |  |  |  |  |  |  | 3,600 |  |  |
State And Local Jurisdiction [Member] |  |  |  |  |  |  |  |  |  |  |  |
Income Taxes [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Operating Loss Carryforwards |  |  |  |  |  |  |  |  | 770 |  |  |
Adoption of U.S. Foreign Currency Tax Regulations [Member] |  |  |  |  |  |  |  |  |  |  |  |
Income Taxes [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Impact on tax rate, amount |  |  |  |  |  |  |  |  | 62 |  |  |
U.S. Plans [Member] |  |  |  |  |  |  |  |  |  |  |  |
Income Taxes [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Additional provisional amount recognized one time benefit | 204 |  | 204 |  |  |  |  |  |  |  |  |
Benefit of contribution | $ 1,500 |  | $ 1,500 |  |  |  | $ 2,500 |  | $ 2,000 |  |  |
[1] | The 2018 and 2017 net benefits consist of foreign deferred tax benefits of $434 million and $94 million, respectively, which were partially offset by U.S. deferred tax expenses of $179 million and $26 million, respectively.

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