Financial Instruments (Fair Value Hedges Outstanding) (Details) (USD $) In Millions, unless otherwise specified							12 Months Ended
	Jun. 30, 2012	Jun. 15, 2012	Aug. 31, 2011	Jun. 30, 2011	Jun. 30, 2012 Swap	Jun. 30, 2011 Swap	Jun. 30, 2012 Swap Minimum	Jun. 30, 2011 Swap Minimum	Jun. 30, 2012 Swap Maximum	Jun. 30, 2011 Swap Maximum
Notional Amount, Pay-floating interest rate swaps	$ 363	$ 206	$ 640	$ 250	$ 773	$ 1,256
Maturity Date							Jun. 15, 2013	Jun. 15, 2012	Jun. 15, 2022	Dec. 15, 2020