CONDENSED CONSOLIDATED BALANCE SHEETS (Parentheticals) - USD ($) $ in Millions	Jul. 31, 2020	Jan. 31, 2020
Allowance for doubtful accounts	$ 6	$ 7
Class A Common Stock
Common stock, par value (in USD per share)	$ 0.01	$ 0.01
Common stock, shares authorized (in shares)	2,500,000,000	2,500,000,000
Common stock, shares issued (in shares)	113,248,000	110,484,000
Common stock, shares outstanding (in shares)	113,248,000	110,484,000
Class B Convertible Common Stock
Common stock, par value (in USD per share)	$ 0.01	$ 0.01
Common stock, shares authorized (in shares)	1,000,000,000	1,000,000,000
Common stock, shares issued (in shares)	307,222,000	307,222,000
Common stock, shares outstanding (in shares)	307,222,000	307,222,000