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, 2013	Mar. 31, 2012	Mar. 31, 2013	Mar. 31, 2012
Schedule of Earnings Per Share, Basic and Diluted, by Common Class [Line Items]
Net income available for common shareholders (A)	$ 6,055	$ 5,108	$ 16,898	$ 17,470
Weighted average outstanding shares of common stock (B)	8,364	8,401	8,385	8,398
Dilutive effect of stock-based awards	65	97	87	104
Common stock and common stock equivalents (C)	8,429	8,498	8,472	8,502
Earnings Per Share
Basic (A/B)	$ 0.72	$ 0.61	$ 2.02	$ 2.08
Diluted (A/C)	$ 0.72	$ 0.60	$ 1.99	$ 2.05