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Income Taxes - Additional Information (Details) - USD ($) $ in Millions |  | 3 Months Ended | 5 Months Ended | 7 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | --- | --- | --- | ---
Feb. 07, 2018 | Feb. 28, 2018 | May 31, 2018 | Dec. 31, 2017 | Feb. 28, 2018 | Feb. 28, 2017 | May 31, 2019 | May 31, 2018
Income Taxes [Line Items] |  |  |  |  |  |  |  |
Statutory federal income tax rate |  |  |  | 35.00% |  |  |  |
Measurement period |  |  |  |  | 1 year |  |  |
Provisional benefit related to remeasurement of net U.S. deferred tax liability |  | $ 1,150 |  |  |  |  |  |
Provisional benefit from foreign tax credits exceeding one-time transition tax on deferred foreign earnings |  | 36 |  |  |  |  |  |
U.S. Pension Plans [Member] |  |  |  |  |  |  |  |
Income Taxes [Line Items] |  |  |  |  |  |  |  |
Additional provisional amount recognized one time benefit |  | $ 204 |  |  |  |  |  |
Benefit of contribution | $ 1,500 |  |  |  | $ 2,500 | $ 1,750 |  |
Scenario Plan [Member] |  |  |  |  |  |  |  |
Income Taxes [Line Items] |  |  |  |  |  |  |  |
Statutory federal income tax rate |  |  | 29.20% |  |  |  | 21.00% |
Scenario, Forecast [Member] |  |  |  |  |  |  |  |
Income Taxes [Line Items] |  |  |  |  |  |  |  |
Income tax benefit related to lower statutory income tax rate year-to-date earnings |  |  |  |  |  |  |  | $ 165

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