Retirement, Other Postretirement Benefits, And Defined Contribution Plans (Plan Assets, Asset Allocations Targets) (Details) (Qualified Pension And Other Postretirement Plans [Member])	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011
Domestic Equity Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Target	45.00%
Range, Minimum	34.00%
Range, Maximum	53.00%
Postretirement Asset Allocation	44.00%	44.00%
Domestic Equity Securities [Member] | Non-Taxables [Member]
Defined Benefit Plan Disclosure [Line Items]
Target	39.00%
Range, Minimum	34.00%
Range, Maximum	44.00%
Postretirement Asset Allocation	38.00%	39.00%
Domestic Equity Securities [Member] | Taxable [Member]
Defined Benefit Plan Disclosure [Line Items]
Target	39.00%
Range, Minimum	34.00%
Range, Maximum	44.00%
Postretirement Asset Allocation	39.00%	35.00%
International Equity Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Target	20.00%
Range, Minimum	16.00%
Range, Maximum	24.00%
Postretirement Asset Allocation	20.00%	18.00%
International Equity Securities [Member] | Non-Taxables [Member]
Defined Benefit Plan Disclosure [Line Items]
Target	26.00%
Range, Minimum	21.00%
Range, Maximum	31.00%
Postretirement Asset Allocation	28.00%	15.00%
International Equity Securities [Member] | Taxable [Member]
Defined Benefit Plan Disclosure [Line Items]
Target	26.00%
Range, Minimum	21.00%
Range, Maximum	31.00%
Postretirement Asset Allocation	27.00%	0.00%
Fixed Income Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Target	35.00%
Range, Minimum	31.00%
Range, Maximum	41.00%
Postretirement Asset Allocation	35.00%	37.00%
Fixed Income Securities [Member] | Non-Taxables [Member]
Defined Benefit Plan Disclosure [Line Items]
Target	35.00%
Range, Minimum	30.00%
Range, Maximum	40.00%
Postretirement Asset Allocation	34.00%	46.00%
Fixed Income Securities [Member] | Taxable [Member]
Defined Benefit Plan Disclosure [Line Items]
Target	35.00%
Range, Minimum	30.00%
Range, Maximum	40.00%
Postretirement Asset Allocation	34.00%	64.00%
Other Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Target	0.00%
Range, Minimum	0.00%
Range, Maximum	10.00%
Postretirement Asset Allocation	1.00%	1.00%
Other Securities [Member] | Non-Taxables [Member]
Defined Benefit Plan Disclosure [Line Items]
Target	0.00%
Range, Minimum	0.00%
Range, Maximum	5.00%
Postretirement Asset Allocation	0.00%	0.00%
Other Securities [Member] | Taxable [Member]
Defined Benefit Plan Disclosure [Line Items]
Target	0.00%
Range, Minimum	0.00%
Range, Maximum	5.00%
Postretirement Asset Allocation	0.00%	1.00%