Basic and Diluted Earnings Per Share (Detail) (USD $) In Millions, except Per Share data, unless otherwise specified	3 Months Ended		9 Months Ended
	Mar. 31, 2012	Mar. 31, 2011	Mar. 31, 2012	Mar. 31, 2011
Schedule of Earnings Per Share, Basic and Diluted, by Common Class [Line Items]
Net income available for common shareholders (A)	$ 5,108	$ 5,232	$ 17,470	$ 17,276
Weighted average outstanding shares of common stock (B)	8,401	8,420	8,398	8,511
Dilutive effect of stock-based awards	97	90	104	98
Common stock and common stock equivalents (C)	8,498	8,510	8,502	8,609
Earnings per share:
Basic (A/B)	$ 0.61	$ 0.62	$ 2.08	$ 2.03
Diluted (A/C)	$ 0.60	$ 0.61	$ 2.05	$ 2.01