Shareowners' Equity (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Accumulated Other Comprehensive Income (Loss), Net Of Tax [Roll Forward]
Beginning balance	$ (793)	$ (712)	$ (749)	$ (734)
Other comprehensive income (loss) before reclassification	12	8	(57)	12
Amounts reclassified from accumulated other comprehensive loss - net of tax	11	11	36	29
Net current-period other comprehensive income (loss)	23	19	(21)	41
Ending balance	(770)	(693)	(770)	(693)
Foreign Currency Translation
Accumulated Other Comprehensive Income (Loss), Net Of Tax [Roll Forward]
Beginning balance	(25)	61	41	61
Other comprehensive income (loss) before reclassification	13	8	(54)	8
Amounts reclassified from accumulated other comprehensive loss - net of tax	0	0	1	0
Net current-period other comprehensive income (loss)	13	8	(53)	8
Ending balance	(12)	69	(12)	69
Employee Benefit Related Adjustments
Accumulated Other Comprehensive Income (Loss), Net Of Tax [Roll Forward]
Beginning balance	(766)	(772)	(789)	(792)
Other comprehensive income (loss) before reclassification	1	0	0	2
Amounts reclassified from accumulated other comprehensive loss - net of tax	11	11	35	29
Net current-period other comprehensive income (loss)	12	11	35	31
Ending balance	(754)	(761)	(754)	(761)
Unrealized Loss, net of tax
Accumulated Other Comprehensive Income (Loss), Net Of Tax [Roll Forward]
Beginning balance	(2)	(1)	(1)	(3)
Other comprehensive income (loss) before reclassification	(2)	0	(3)	2
Amounts reclassified from accumulated other comprehensive loss - net of tax	0	0	0	0
Net current-period other comprehensive income (loss)	(2)	0	(3)	2
Ending balance	$ (4)	$ (1)	$ (4)	$ (1)