BALANCE SHEETS (Parenthetical) - USD ($) $ in Millions	Jun. 30, 2021	Jun. 30, 2020
Statement Of Financial Position [Abstract]
Accounts receivable, allowance for doubtful accounts	$ 751	$ 788
Property and equipment, accumulated depreciation	$ 51,351	$ 43,197
Common stock, shares authorized	24,000,000,000	24,000,000,000
Common stock, outstanding	7,519,000,000	7,571,000,000