Shareholders' Equity (Details) (USD $) In Millions, except Share data, unless otherwise specified	12 Months Ended
	Jun. 30, 2011 years acquisitions securities days segments VIEs	Jun. 30, 2010 years acquisitions	Jun. 30, 2009 acquisitions years
Shareholders' Equity
Common stock, shares authorized	1,000,000,000
Common stock, no par value (in dollars per share)	$ 0
Preferred stock, no par value (in dollars per share)	$ 0
Preferred stock, shares authorized	500,000
Treasury stock, shares	40,300,000	32,600,000
Treasury stock recorded at cost as a reduction of common stock (in dollars)	$ 1,100	$ 838
The assumptions used in the Black-Scholes single option pricing model
Dividend yield (as a percent)	2.00%	2.00%	2.00%
Risk-free interest rate (as a percent)	2.00%	2.00%	3.00%
Stock volatility (as a percent)	31.00%	32.00%	30.00%
Average expected life (in years)	8	8	8
A summary of option activity
Shares under option at beginning of period	11,260,000
Shares under option, Granted	1,693,000
Shares under option, Exercised	(1,191,000)
Shares under option, Forfeited or expired	(39,000)
Shares under option at end of period	11,723,000	11,260,000
Shares under option, Exercisable	5,726,000
Weighted-average exercise price of Shares under option at beginning of period (in dollars per share)	$ 27.12
Weighted-average exercise price of Shares under option, Granted (in dollars per share)	$ 30.71
Weighted-average exercise price of Shares under option, Exercised (in dollars per share)	$ 20.30
Weighted-average exercise price of Shares under option, Forfeited or expired (in dollars per share)	$ 21.93
Weighted-average exercise price of Shares under option at end of period (in dollars per share)	$ 28.35	$ 27.12
Weighted-average exercise price of Shares under option, exercisable (in dollars per share)	$ 27.42
The weighted-average remaining contractual term of options outstanding (in years)	6
The weighted-average remaining contractual term of options exercisable (in years)	5
The aggregate intrinsic value of options outstanding (in dollars)	43
The aggregate intrinsic value of options exercisable (in dollars)	16
The weighted-average grant-date fair values of options granted (in dollars per share)	$ 8.82	$ 8.50	$ 7.81
The total intrinsic values of options exercised (in dollars)	21	11	17
Cash proceeds received from options exercised (in dollars)	$ 21	$ 11	$ 11
A summary of Restricted Stock Awards activity and PSU's
Restricted Stock Awards and PSU's, Non-vested at beginning of period	3,268,000
Restricted Stock Awards and PSU's, Granted	1,114,000	1,000,000	1,100,000
Restricted Stock Awards, Vested	(1,236,000)
Restricted Stock Awards and PSU's, Forfeited	(31,000)
Restricted Stock Awards and PSU's, Non-vested at end of period	3,115,000	3,268,000
Weighted average grant-date fair value of Restricted Stock Awards and PSU's, Non-vested at beginning of period (in dollars per share)	$ 29.36
Weighted average grant-date fair value of Restricted Stock Awards and PSU's, Granted (in dollars per share)	$ 32.19	$ 26.55	$ 26.03
Weighted average grant-date fair value of Restricted Stock Awards, Vested (in dollars per share)	$ 34.39
Weighted average grant-date fair value of Restricted Stock Awards and PSU's, Forfeited (in dollars per share)	$ 28.80
Weighted average grant-date fair value of Restricted Stock Awards and PSU's, Non-vested at end of period (in dollars per share)	$ 28.39	$ 29.36