Balance Sheets (Parenthetical) (USD $) In Millions, unless otherwise specified	Dec. 31, 2013	Jun. 30, 2013
Short-term investments, securities loaned	$ 685	$ 579
Accounts receivable, allowance for doubtful accounts	316	336
Property and equipment, accumulated depreciation	$ 13,686	$ 12,513
Common stock, shares authorized	24,000	24,000
Common stock, outstanding	8,300	8,328