Rationalization Of Operations (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended		6 Months Ended			12 Months Ended		3 Months Ended		6 Months Ended		3 Months Ended		6 Months Ended		3 Months Ended		6 Months Ended		3 Months Ended		6 Months Ended		3 Months Ended		6 Months Ended				6 Months Ended		6 Months Ended		6 Months Ended
	Mar. 31, 2013	Mar. 31, 2012	Mar. 31, 2013	Mar. 31, 2012	Sep. 30, 2012	Sep. 30, 2013 Minimum [Member]	Sep. 30, 2013 Maximum [Member]	Mar. 31, 2013 Process Management [Member]	Mar. 31, 2012 Process Management [Member]	Mar. 31, 2013 Process Management [Member]	Mar. 31, 2012 Process Management [Member]	Mar. 31, 2013 Industrial Automation [Member]	Mar. 31, 2012 Industrial Automation [Member]	Mar. 31, 2013 Industrial Automation [Member]	Mar. 31, 2012 Industrial Automation [Member]	Mar. 31, 2013 Network Power [Member]	Mar. 31, 2012 Network Power [Member]	Mar. 31, 2013 Network Power [Member]	Mar. 31, 2012 Network Power [Member]	Mar. 31, 2013 Climate Technologies [Member]	Mar. 31, 2012 Climate Technologies [Member]	Mar. 31, 2013 Climate Technologies [Member]	Mar. 31, 2012 Climate Technologies [Member]	Mar. 31, 2013 Commercial & Residential Solutions [Member]	Mar. 31, 2012 Commercial & Residential Solutions [Member]	Mar. 31, 2013 Commercial & Residential Solutions [Member]	Mar. 31, 2012 Commercial & Residential Solutions [Member]	Mar. 31, 2013 Severance and benefits [Member]	Sep. 30, 2012 Severance and benefits [Member]	Mar. 31, 2013 Lease and other contract terminations [Member]	Sep. 30, 2012 Lease and other contract terminations [Member]	Mar. 31, 2013 Vacant facility and other shutdown costs [Member]	Sep. 30, 2012 Vacant facility and other shutdown costs [Member]	Mar. 31, 2013 Start-up and moving costs [Member]	Sep. 30, 2012 Start-up and moving costs [Member]
Rationalization Of Operations [Line Items]
Rationalization of operations, liability	$ 27		$ 27		$ 32																							$ 19	$ 23	$ 5	$ 5	$ 2	$ 3	$ 1	$ 1
Rationalization of operations, expense	16	31	32	54				4	4	7	9	5	4	10	8	5	16	9	26	1	4	2	6	1	3	4	5	13		2		4		13
Rationalization of operations, paid/utilized during the period			37																									17		2		5		13
Expected fiscal year rationalization expense						$ 75	$ 85