Short-Term Borrowings and Bank Lines of Credit (Details 2)	Dec. 31, 2015	Dec. 31, 2014
Line of Credit Facility [Line Items]
Weighted average interest rate	2.16%	1.96%
FES
Line of Credit Facility [Line Items]
Weighted average interest rate	0.00%	3.34%

Weighted average interest rate of short-term debt outstanding.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.19(b))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

Name:	us-gaap_ShortTermDebtWeightedAverageInterestRate
Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant