BALANCE SHEETS (Parenthetical) (USD $) In Millions, unless otherwise specified	Mar. 31, 2012	Jun. 30, 2011
Short-term investments, securities loaned	$ 1,181	$ 1,181	[1]
Accounts receivable, allowance for doubtful accounts	322	333	[1]
Property and equipment, accumulated depreciation	10,952	9,829	[1]
Common stock, shares authorized	24,000	24,000	[1]
Common stock, outstanding	8,400	8,376	[1]
Retained earnings (deficit), accumulated other comprehensive income	$ 1,332	$ 1,863	[1]

[1] Derived from audited financial statements.