VALUATION AND QUALIFYING ACCOUNTS (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Sep. 30, 2014		Sep. 30, 2013		Sep. 30, 2012
Allowance for doubtful accounts [Member]
Valuation and Qualifying Accounts Disclosure [Line Items]
Beginning balance	$ 9		$ 7		$ 5
Charged to costs and expenses	(2)		3		2
Other deductions	(1)	[1]	(1)	[1]	0	[1]
Ending balance	6		9		7
Deferred tax asset valuation allowance [Member]
Valuation and Qualifying Accounts Disclosure [Line Items]
Beginning balance	1,166		1,204		1,255
Charged to costs and expenses	(89)		44		(68)
Other deductions	(47)	[2]	(82)	[2]	17	[2]
Ending balance	$ 1,030		$ 1,166		$ 1,204

[1] Uncollectible accounts written off.

[2] Primarily relates to revaluation of defined pension and retiree medical obligations.