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Pension Plan and Employee Benefits, Pension Plan Investment Objectives (Details)
12 Months Ended
Dec. 31, 2015
Defined Benefit Plan Disclosure [Line Items]  
Maximum notional value of derivative positions of the total pension fund's value 20.00%
Pension Benefits [Member] | Domestic equity [Member]  
Investment asset allocation target percentage of total plan assets [Abstract]  
Target plan allocations 16.00%
Pension Benefits [Member] | International equity [Member]  
Investment asset allocation target percentage of total plan assets [Abstract]  
Target plan allocations 16.00%
Pension Benefits [Member] | Real estate funds [Member]  
Investment asset allocation target percentage of total plan assets [Abstract]  
Target plan allocations 7.00%
Pension Benefits [Member] | Hedge Funds [Member]  
Investment asset allocation target percentage of total plan assets [Abstract]  
Target plan allocations 1.00%
Pension Benefits [Member] | Return Seeking [Member]  
Investment asset allocation target percentage of total plan assets [Abstract]  
Target plan allocations, minimum 35.00%
Target plan allocations 40.00%
Target plan allocations, maximum 45.00%
Pension Benefits [Member] | Fixed income- long government/credit [Member]  
Investment asset allocation target percentage of total plan assets [Abstract]  
Target plan allocations 20.00%
Pension Benefits [Member] | Fixed income- long credit [Member]  
Investment asset allocation target percentage of total plan assets [Abstract]  
Target plan allocations 40.00%
Pension Benefits [Member] | Liability Hedging [Member]  
Investment asset allocation target percentage of total plan assets [Abstract]  
Target plan allocations, minimum 55.00%
Target plan allocations 60.00%
Target plan allocations, maximum 65.00%