BALANCE SHEETS (Parenthetical) - USD ($) $ in Millions	Mar. 31, 2021	Jun. 30, 2020
Statement Of Financial Position [Abstract]
Accounts receivable, allowance for doubtful accounts	$ 620	$ 788
Property and equipment, accumulated depreciation	$ 49,681	$ 43,197
Common stock, shares authorized	24,000,000,000	24,000,000,000
Common stock, outstanding	7,534,000,000	7,571,000,000