Commitments and Contingencies (Details) (USD $) In Millions	Sep. 30, 2011	Jun. 30, 2010
Commitments and Contingencies Note Details [Abstract]
Commitments to acquire property, plant and equipment	$ 2,641
Water abatement oil sands [Member]
Site Contingency [Line Items]
Site Contingency, Accrual, Undiscounted Amount	$ 56	$ 64

Estimated undiscounted amount of the accrual for the environmental loss contingencies at an individual site as of the balance sheet date.

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

-Publisher AICPA

-Name Statement of Position (SOP)

-Number 96-1

-Paragraph 132, 161, 163

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