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Income Taxes - Additional Information (Details) - USD ($) $ in Millions | 3 Months Ended | 7 Months Ended | 12 Months Ended
--- | --- | --- | ---
May 31, 2019 | Feb. 28, 2019 | Nov. 30, 2018 | Aug. 31, 2018 | May 31, 2018 | Feb. 28, 2018 | Nov. 30, 2017 | Dec. 31, 2017 | May 31, 2019 | May 31, 2018 | May 31, 2017
Income Taxes [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Earnings From Foreign Operations |  |  |  |  |  |  |  |  | $ 929 | $ 958 |  | $ 919 |
Statutory Federal Income Tax Rate |  |  |  |  |  |  |  | 35.00% | 21.00% | 29.20% |  | 35.00% |
Benefit from reduction of valuation allowance on tax loss carryforwards |  |  |  |  |  |  |  |  | $ 90 |  |  |  |
Income tax benefit related to lower statutory Income tax rate on earnings | $ 200 | $ 60 | $ 150 | $ 135 | $ 100 | $ 165 |  |  | 40 |  |  |  |
Income tax benefit from accelerated deductions to be claimed on 2018 tax return |  |  |  |  |  |  |  |  | 75 |  |  |  |
Provisional benefit related to remeasurement of net U.S. deferred tax liability |  |  |  |  |  | (1,150) |  |  |  | $ (1,150) |  |  |
Tax benefit from corporate structuring transactions |  |  |  |  | 255 |  |  |  |  | 255 | [1] | $ 68 | [1]
Tax benefits from foreign tax credits |  |  |  |  | 133 | 12 | $ 80 |  | 8 | 225 |  |  |
Impact on tax rate, amount |  |  |  |  |  |  |  |  | 50 | 6 |  |  |
Recognition of benefit from TCJA |  |  |  |  |  |  |  |  | 8 | 225 |  |  |
Recognition of benefit reversal, if unsuccessful |  |  |  |  |  |  |  |  | 233 |  |  |  |
Provisional benefit related to remeasurement of net U.S. deferred tax liability, income tax expense amount recognized |  |  |  |  |  |  |  |  | 4 |  |  |  |
Unrecognized Tax Benefits That Would Impact Effective Tax Rate | 141 |  |  |  | 142 |  |  |  | 141 | 142 |  |  |
Unrecognized Tax Benefits Accrued Income Tax Penalties And Interest | 38 |  |  |  | $ 35 |  |  |  | 38 | 35 |  |  |
Foreign Country [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Income Taxes [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Operating Loss Carryforwards | 3,400 |  |  |  |  |  |  |  | 3,400 |  |  |  |
State And Local Jurisdiction [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Income Taxes [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Operating Loss Carryforwards | $ 780 |  |  |  |  |  |  |  | 780 |  |  |  |
U.S. Plans [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Income Taxes [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Income tax benefit related to lower statutory Income tax rate on earnings |  |  |  |  |  |  |  |  |  | 265 |  |  |
Additional provisional amount recognized one time benefit |  |  |  |  |  | $ 204 |  |  |  | 204 |  |  |
Defined benefit plan contributions by employer for one-time benefit |  |  |  |  |  |  |  |  |  | $ 1,500 |  |  |
Adoption of U.S. Foreign Currency Tax Regulations [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Income Taxes [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Impact on tax rate, amount |  |  |  |  |  |  |  |  |  |  |  | $ 62 |
Netherlands [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Income Taxes [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Expense from the impact on deferred taxes attributable to a lower enacted tax rate |  |  |  |  |  |  |  |  | $ 50 |  |  |  |
[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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