Derivative Instruments & Hedging Activities (Fair Value Of Derivatives Designated As Hedging Instruments) (Details) (Designated As Hedging Instrument [Member], USD $) In Millions	Sep. 30, 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	1	1
Total fair value of derivatives liabilities designated as hedging instrument	$ 1	$ 1

Fair value as of the balance sheet date of all price risk derivative liabilities designated as cash flow hedging instruments.

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 133

-Paragraph 17

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 815

-SubTopic 10

-Section 50

-Paragraph 4B

-Subparagraph (c)(1)

-URI http://asc.fasb.org/extlink&oid=6935481&loc=SL5624163-113959

Name:	us-gaap_PriceRiskCashFlowHedgeLiabilityAtFairValue
Namespace Prefix:	us-gaap
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant