Retirement Benefits and Trusteed Assets (Details 5) (Pension Plans, Defined Benefit [Member])	12 Months Ended
	Dec. 31, 2012
Pension Plan Target Allocations of Plan Assets [Line Items]
Defined Benefit Plan Target Allocation Percentage of Assets Hedged Funds and Similar Investments	20.00%
Defined Benefit Plan Target Allocation Percentage of Assets Total	100.00%
Us Large Cap Equity Securities [Member]
Pension Plan Target Allocations of Plan Assets [Line Items]
Defined Benefit Plan, Target Allocation Percentage of Assets, Equity Securities	22.00%
US Small Cap and Mid Cap Equity Securities [Member]
Pension Plan Target Allocations of Plan Assets [Line Items]
Defined Benefit Plan, Target Allocation Percentage of Assets, Equity Securities	5.00%
Non US Equity Securities [Member]
Pension Plan Target Allocations of Plan Assets [Line Items]
Defined Benefit Plan, Target Allocation Percentage of Assets, Equity Securities	20.00%
Fixed Income Securities [Member]
Pension Plan Target Allocations of Plan Assets [Line Items]
Defined Benefit Plan, Target Allocation Percentage of Assets, Equity Securities	25.00%
Equity Securities, Other [Member]
Pension Plan Target Allocations of Plan Assets [Line Items]
Defined Benefit Plan, Target Allocation Percentage of Assets, Equity Securities	8.00%