Rationalization Of Operations (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended		6 Months Ended		12 Months Ended
	Mar. 31, 2012	Mar. 31, 2011	Mar. 31, 2012	Mar. 31, 2011	Sep. 30, 2012	Sep. 30, 2011
Rationalization Of Operations [Line Items]
Rationalization of operations, expense	$ 31	$ 16	$ 54	$ 33
Rationalization of operations, liability	25		25			30
Rationalization of operations, paid/utilized during the period			59
Expected fiscal year rationalization expense					125
Severance And Benefits [Member]
Rationalization Of Operations [Line Items]
Rationalization of operations, expense			24
Rationalization of operations, liability	16		16			24
Rationalization of operations, paid/utilized during the period			32
Lease And Other Contract Terminations [Member]
Rationalization Of Operations [Line Items]
Rationalization of operations, expense			8
Rationalization of operations, liability	6		6			3
Rationalization of operations, paid/utilized during the period			5
Fixed Asset Write-Downs [Member]
Rationalization Of Operations [Line Items]
Rationalization of operations, expense			2
Rationalization of operations, liability	0		0			0
Rationalization of operations, paid/utilized during the period			2
Vacant Facility And Other Shutdown Costs [Member]
Rationalization Of Operations [Line Items]
Rationalization of operations, expense			6
Rationalization of operations, liability	3		3			2
Rationalization of operations, paid/utilized during the period			5
Start-Up And Moving Costs [Member]
Rationalization Of Operations [Line Items]
Rationalization of operations, expense			14
Rationalization of operations, liability	0		0			1
Rationalization of operations, paid/utilized during the period			15
Process Management [Member]
Rationalization Of Operations [Line Items]
Rationalization of operations, expense	4	2	9	4
Industrial Automation [Member]
Rationalization Of Operations [Line Items]
Rationalization of operations, expense	4	5	8	10
Network Power [Member]
Rationalization Of Operations [Line Items]
Rationalization of operations, expense	16	5	26	10
Climate Technologies [Member]
Rationalization Of Operations [Line Items]
Rationalization of operations, expense	4	2	6	6
Commercial & Residential Solutions [Member]
Rationalization Of Operations [Line Items]
Rationalization of operations, expense	$ 3	$ 2	$ 5	$ 3