Commitments And Contingent Liabilities Guarantees (Details) (Indirect Guarantee of Indebtedness, USD $) In Millions, unless otherwise specified	3 Months Ended
Mar. 31, 2015
Indirect Guarantee of Indebtedness
Loss Contingencies [Line Items]
Guarantor obligations, maximum exposure, undiscounted	$ 40.0
Guarantor obligations, term	P2Y

Maximum potential amount of future payments (undiscounted) the guarantor could be required to make under the guarantee or each group of similar guarantees before reduction for potential recoveries under recourse or collateralization provisions.

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 460

-SubTopic 10

-Section 50

-Paragraph 4

-Subparagraph (b)(1)

-URI http://asc.fasb.org/extlink&oid=6851643&loc=d3e12069-110248

Name:	us-gaap_GuaranteeObligationsMaximumExposure
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant