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BALANCE SHEETS (Parenthetical) - USD ($) $ in Millions | Sep. 30, 2020 | Jun. 30, 2020
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Statement Of Financial Position [Abstract] |  |
Accounts receivable, allowance for doubtful accounts | $ 610 | $ 788
Property and equipment, accumulated depreciation | $ 45,417 | $ 43,197
Common stock, shares authorized | 24,000,000,000 | 24,000,000,000
Common stock, outstanding | 7,564,000,000 | 7,571,000,000

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