Accumulated Other Comprehensive Loss (AOCL) (Reclassifications from AOCI) (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended		6 Months Ended
	Mar. 31, 2014	Mar. 31, 2013	Mar. 31, 2014		Mar. 31, 2013
Accumulated Other Comprehensive Income (Loss) [Line Items]
INCOME (LOSS) FROM CONTINUING OPERATIONS	$ 0	$ (4)	$ 13		$ (20)
Provision for income taxes	(9)	(7)	(19)		(17)
Net income (loss)	3	(4)	16		(25)
Reclassification out of Accumulated Other Comprehensive Income [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Net income (loss)			18
Reclassification out of Accumulated Other Comprehensive Income [Member] | Employee Benefit Related Adjustment [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Prior service costs			(4)	[1]
Acturial losses			23	[1]
INCOME (LOSS) FROM CONTINUING OPERATIONS			19
Provision for income taxes			(1)
Net income (loss)			$ 18

[1] These accumulated other comprehensive income components are included in the computation of net periodic pension and retiree medical expense (see Note 18. Retirement Benefit Liabilities for additional details).