Schedule II - Valuation and Qualifying Accounts (Detail) - USD ($) $ in Millions	12 Months Ended
	May 31, 2017	May 31, 2016	May 31, 2015
Allowance for Sales Returns
Movement in Valuation Allowances and Reserves [Roll Forward]
Balance at Beginning of Period	$ 444	$ 379	$ 308
Charged to Costs and Expenses	696	788	726
Charged to Other Accounts	3	(15)	(35)
Write-Offs, Net	(800)	(708)	(620)
Balance at End of Period	343	444	379
Allowance for Doubtful Accounts
Movement in Valuation Allowances and Reserves [Roll Forward]
Balance at Beginning of Period	43	78	78
Charged to Costs and Expenses	16	52	35
Charged to Other Accounts	0	(2)	(15)
Write-Offs, Net	(40)	(85)	(20)
Balance at End of Period	$ 19	$ 43	$ 78