Derivative Instruments & Hedging Activities (Fair Value Of Derivatives Designated As Hedging Instruments) (Details) (Designated As Hedging Instrument [Member], USD $) In Millions, unless otherwise specified	Dec. 31, 2011	Jun. 30, 2011
Designated As Hedging Instrument [Member]
Fair value of derivatives designated as hedging instrument
Commodity Contracts Assets	$ 0	$ 1
Total fair value of derivatives assets designated as hedging instrument	0	1
Commodity Contracts Liabilities	2	1
Total fair value of derivatives liabilities designated as hedging instrument	$ 2	$ 1