Basis of Presentation And Recently Issued Accounting Pronouncements (Details) (USD $) In Millions, unless otherwise specified	6 Months Ended
Mar. 31, 2013
Accounting Changes [Abstract]
Adjustment to reflect capital expenditures when payment is made	$ 62

Adjustment to reflect capital expenditures when payment is made versus when equipment is received.

No definition available.

Name:	emr_Adjustmenttoreflectcapitalexpenditureswhenpaymentismade
Namespace Prefix:	emr_
Data Type:	xbrli:monetaryItemType
Balance Type:	na
Period Type:	duration