Commitments And Contingencies (Narrative) (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2014
Surety Bond [Member]
Loss Contingencies [Line Items]
Values associated with surety arrangements	$ 102
Amount exposed to bond	$ 33
Minimum [Member]
Loss Contingencies [Line Items]
Cost basis of component parts as a percentage of revenues	5.00%
Maximum [Member]
Loss Contingencies [Line Items]
Cost basis of component parts as a percentage of revenues	10.00%