BALANCE SHEETS (Parenthetical) - USD ($) $ in Millions	Mar. 31, 2020	Jun. 30, 2019
Statement Of Financial Position [Abstract]
Accounts receivable, allowance for doubtful accounts	$ 446	$ 411
Property and equipment, accumulated depreciation	$ 41,512	$ 35,330
Common stock, shares authorized	24,000,000,000	24,000,000,000
Common stock, outstanding	7,590,000,000	7,643,000,000