BALANCE SHEETS (Parenthetical) - USD ($) $ in Millions	Jun. 30, 2018	Jun. 30, 2017
Statement Of Financial Position [Abstract]
Accounts receivable, allowance for doubtful accounts	$ 377	$ 345
Property and equipment, accumulated depreciation	$ 29,223	$ 24,179
Common stock, shares authorized	24,000,000,000	24,000,000,000
Common stock, outstanding	7,677,000,000	7,708,000,000