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BALANCE SHEETS (Parenthetical) - USD ($)
$ in Millions
Dec. 31, 2017
Jun. 30, 2017
Statement Of Financial Position [Abstract]    
Short-term investments, securities loaned $ 4,247 $ 3,694
Accounts receivable, allowance for doubtful accounts 337 345
Property and equipment, accumulated depreciation $ 26,849 $ 24,179
Common stock, shares authorized 24,000,000,000 24,000,000,000
Common stock, outstanding 7,705,000,000 7,708,000,000