Recent Accounting Guidance - Additional Information (Details) - USD ($) $ in Millions	Jun. 01, 2019	May 31, 2020
New Accounting Pronouncements Or Change In Accounting Principle [Line Items]
Operating lease liability	$ 14,200	$ 14,118
Operating right-of-use asset	14,100	$ 13,917
Cumulative effect on retained earnings, before tax	57
Cumulative effect on retained earnings, net of tax	47
Prepaid Asset [Member]
New Accounting Pronouncements Or Change In Accounting Principle [Line Items]
Operating right-of-use asset	154
Net Deferred Rent Liability [Member]
New Accounting Pronouncements Or Change In Accounting Principle [Line Items]
Operating right-of-use asset	$ 309