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Retirement Benefits - Pension and Other Postretirement Benefit Plan Target Asset Allocations (Details)
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]    
Percentage of Plan Assets 100.00% 100.00%
Other Postretirement Benefit Plan, Defined Benefit [Member]    
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]    
Percentage of Plan Assets 43.00% 42.00%
Pension Plan, Defined Benefit [Member]    
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]    
Percentage of Plan Assets 35.00% 33.00%
Equity Securities [Member] | Other Postretirement Benefit Plan, Defined Benefit [Member]    
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]    
Target asset allocation percentage 39.00%  
Equity Securities [Member] | Pension Plan, Defined Benefit [Member]    
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]    
Target asset allocation percentage 32.00%  
Fixed Income Securities [Member] | Other Postretirement Benefit Plan, Defined Benefit [Member]    
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]    
Target asset allocation percentage 26.00%  
Percentage of Plan Assets 27.00% 34.00%
Fixed Income Securities [Member] | Pension Plan, Defined Benefit [Member]    
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]    
Target asset allocation percentage 37.00%  
Percentage of Plan Assets 34.00% 37.00%
Alternative Investments [Member] | Other Postretirement Benefit Plan, Defined Benefit [Member]    
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]    
Target asset allocation percentage [1] 35.00%  
Percentage of Plan Assets [1] 30.00% 24.00%
Alternative Investments [Member] | Pension Plan, Defined Benefit [Member]    
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]    
Target asset allocation percentage [1] 31.00%  
Percentage of Plan Assets [1] 31.00% 30.00%
[1] Alternative investments include private equity, hedge funds, real estate, and private credit.