Summary of Significant Accounting Policies (Details) (USD $) In Millions, unless otherwise specified	9 Months Ended
Jun. 30, 2013
Summary of Significant Accounting Policies [Abstract]
Adjustment to reflect capital expenditures when payment is made	$ 57

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:	debit
Period Type:	duration