Schedule II - Valuation and Qualifying Accounts (Detail) - USD ($) $ in Millions	12 Months Ended
	May 31, 2018	May 31, 2017	May 31, 2016
Allowance for Sales Returns
Movement in Valuation Allowances and Reserves [Roll Forward]
Balance at Beginning of Period	$ 343	$ 444	$ 379
Charged to Costs and Expenses	640	696	788
Charged to Other Accounts	5	3	(15)
Write-Offs, Net	(658)	(800)	(708)
Balance at End of Period	330	343	444
Allowance for Doubtful Accounts
Movement in Valuation Allowances and Reserves [Roll Forward]
Balance at Beginning of Period	19	43	78
Charged to Costs and Expenses	19	16	52
Charged to Other Accounts	0	0	(2)
Write-Offs, Net	(8)	(40)	(85)
Balance at End of Period	$ 30	$ 19	$ 43