Employee Benefit Plans (Allocation of Plan Assets) (Details)	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011
Pension Plans
Defined Benefit Plan, Assets, Target Allocations [Abstract]
Target allocation, Equity securities	100.00%
Defined Benefit Plan, Actual Plan Asset Allocations	100.00%	100.00%
Postretirement Benefit Plans
Defined Benefit Plan, Assets, Target Allocations [Abstract]
Target allocation, Equity securities	100.00%
Defined Benefit Plan, Actual Plan Asset Allocations	100.00%	100.00%
Equity Securities | Pension Plans
Defined Benefit Plan, Assets, Target Allocations [Abstract]
Target allocation, Equity securities	41.00%
Defined Benefit Plan, Actual Plan Asset Allocations	41.00%	39.00%
Equity Securities | Postretirement Benefit Plans
Defined Benefit Plan, Assets, Target Allocations [Abstract]
Target allocation, Equity securities	60.00%
Defined Benefit Plan, Actual Plan Asset Allocations	60.00%	60.00%
Debt Securities | Pension Plans
Defined Benefit Plan, Assets, Target Allocations [Abstract]
Target allocation, Equity securities	38.00%
Defined Benefit Plan, Actual Plan Asset Allocations	38.00%	40.00%
Debt Securities | Postretirement Benefit Plans
Defined Benefit Plan, Assets, Target Allocations [Abstract]
Target allocation, Equity securities	40.00%
Defined Benefit Plan, Actual Plan Asset Allocations	40.00%	40.00%
Other Securities | Pension Plans
Defined Benefit Plan, Assets, Target Allocations [Abstract]
Target allocation, Equity securities	21.00%
Defined Benefit Plan, Actual Plan Asset Allocations	21.00%	21.00%
Other Securities | Postretirement Benefit Plans
Defined Benefit Plan, Assets, Target Allocations [Abstract]
Target allocation, Equity securities	0.00%
Defined Benefit Plan, Actual Plan Asset Allocations	0.00%	0.00%