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Income Taxes - Additional Information (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended		12 Months Ended
	Nov. 30, 2020	Nov. 30, 2019	Nov. 30, 2020	Nov. 30, 2019	May 31, 2019	May 31, 2015
Income Taxes [Line Items]
Effective tax rate	12.80%	2.10%	18.00%	16.80%
Income tax expense (benefit)	$ 180	$ 12	$ 541	$ 263
Statutory Federal Income Tax Rate						35.00%
Benefit from reduction of valuation allowance				$ 133
Recognition of cumulative benefit from TCJA					$ 233
IRS [Member]
Income Taxes [Line Items]
Income tax expense (benefit)	$ (130)
CARES Act [Member]
Income Taxes [Line Items]
Income tax expense (benefit)			$ (191)

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Income taxes.

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Percentage of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.

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