RETIREMENT MEDICAL PLANS (Details 1) (USD $) In Millions, unless otherwise specified	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2012
Defined Benefit Plan, Benefit Obligation	$ 1,794	$ 1,708
Retired Employees [Member]
Defined Benefit Plan, Benefit Obligation	465	495
Employees Eligible to Retire [Member]
Defined Benefit Plan, Benefit Obligation	4	8
Employees Not Eligible to Retire [Member]
Defined Benefit Plan, Benefit Obligation	8	8
Retiree Medical Plan [Member]
Defined Benefit Plan, Benefit Obligation	$ 477	$ 511	$ 554

1) For defined benefit pension plans, the benefit obligation is the projected benefit obligation, which is the actuarial present value as of a date of all benefits attributed by the pension benefit formula to employee service rendered prior to that date. 2) For other postretirement defined benefit plans, the benefit obligation is the accumulated postretirement benefit obligation, which is the actuarial present value of benefits attributed to employee service rendered to a particular date.

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 715

-SubTopic 20

-Section 50

-Paragraph 1

-Subparagraph (a)

-URI http://asc.fasb.org/extlink&oid=35743120&loc=d3e1928-114920

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

-Publisher FASB

-Name Accounting Standards Codification

-Glossary Projected Benefit Obligation

-URI http://asc.fasb.org/extlink&oid=6522206

Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Glossary Accumulated Postretirement Benefit Obligation

-URI http://asc.fasb.org/extlink&oid=6503904

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Data Type:	xbrli:monetaryItemType
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