Benefit Plans (Allocation Of Plan Assets) (Details)	12 Months Ended
	Dec. 31, 2014
Pension Plans, Defined Benefit [Member] | Cash and Equivalents [Member]
Defined Benefit Plan Disclosure [Line Items]
Target range allocation, minimum	0.00%
Target range allocation, maximum	5.00%
Actual allocation	5.00%
Pension Plans, Defined Benefit [Member] | U.S. Large Cap Core [Member]
Defined Benefit Plan Disclosure [Line Items]
Target range allocation, minimum	8.00%
Target range allocation, maximum	18.00%
Actual allocation	13.00%
Pension Plans, Defined Benefit [Member] | U.S. Large Cap Value [Member]
Defined Benefit Plan Disclosure [Line Items]
Target range allocation, minimum	2.50%
Target range allocation, maximum	12.50%
Actual allocation	7.00%
Pension Plans, Defined Benefit [Member] | U.S. Large Cap Growth [Member]
Defined Benefit Plan Disclosure [Line Items]
Target range allocation, minimum	2.50%
Target range allocation, maximum	12.50%
Actual allocation	7.00%
Pension Plans, Defined Benefit [Member] | U.S. Small Cap Value [Member]
Defined Benefit Plan Disclosure [Line Items]
Target range allocation, minimum	0.00%
Target range allocation, maximum	4.00%
Actual allocation	1.00%
Pension Plans, Defined Benefit [Member] | U.S. Small Cap Growth [Member]
Defined Benefit Plan Disclosure [Line Items]
Target range allocation, minimum	0.00%
Target range allocation, maximum	4.00%
Actual allocation	2.00%
Pension Plans, Defined Benefit [Member] | International - Developed Markets [Member]
Defined Benefit Plan Disclosure [Line Items]
Target range allocation, minimum	7.00%
Target range allocation, maximum	19.00%
Actual allocation	10.00%
Pension Plans, Defined Benefit [Member] | International - Emerging Markets [Member]
Defined Benefit Plan Disclosure [Line Items]
Target range allocation, minimum	0.00%
Target range allocation, maximum	10.00%
Actual allocation	5.00%
Pension Plans, Defined Benefit [Member] | Global Asset Allocation Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Target range allocation, minimum	5.00%
Target range allocation, maximum	15.00%
Actual allocation	10.00%
Pension Plans, Defined Benefit [Member] | Risk Parity Allocation Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Target range allocation, minimum	5.00%
Target range allocation, maximum	15.00%
Actual allocation	10.00%
Pension Plans, Defined Benefit [Member] | Fixed Income Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Target range allocation, minimum	20.00%
Target range allocation, maximum	40.00%
Actual allocation	30.00%
Other Postretirement Benefits Plans [Member] | Cash and Equivalents [Member]
Defined Benefit Plan Disclosure [Line Items]
Target range allocation, minimum	0.00%
Target range allocation, maximum	5.00%
Actual allocation	2.00%
Other Postretirement Benefits Plans [Member] | Domestic [Member]
Defined Benefit Plan Disclosure [Line Items]
Target range allocation, minimum	25.00%
Target range allocation, maximum	45.00%
Actual allocation	36.00%
Other Postretirement Benefits Plans [Member] | International [Member]
Defined Benefit Plan Disclosure [Line Items]
Target range allocation, minimum	10.00%
Target range allocation, maximum	20.00%
Actual allocation	14.00%
Other Postretirement Benefits Plans [Member] | Global Asset Allocation Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Target range allocation, minimum	20.00%
Target range allocation, maximum	40.00%
Actual allocation	29.00%
Other Postretirement Benefits Plans [Member] | Fixed Income Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Target range allocation, minimum	10.00%
Target range allocation, maximum	30.00%
Actual allocation	19.00%