Employee and Retiree Benefit Plans (Weighted-Average Assumptions used in Measurement of Benefit Obligations and Net Periodic Benefit Expense) (Details)	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014
Defined Benefit Plan Disclosure [Line Items]
Benefit Obligations, Expected return on plan assets	6.00%
Pension Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
Benefit Obligations, Discount rate	4.37%	3.94%
Benefit Obligations, Expected return on plan assets	6.00%	6.11%
Benefit Obligation, Rate of compensation increase	3.74%	3.69%
Net Periodic Benefit Expense, Discount rate	4.04%	4.56%
Net Periodic Benefit Expense, Rate of compensation increase	3.74%	3.69%
Other Postretirement Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
Benefit Obligations, Discount rate	4.61%	4.12%
Net Periodic Benefit Expense, Discount rate	4.12%	4.91%
Equity Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Benefit Obligations, Expected return on plan assets	8.00%
Fixed Income Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Benefit Obligations, Expected return on plan assets	3.71%