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Employee Benefit Plans - Defined Benefit Plan and Other Postretirement Benefit Plans Narrative (Details)
$ in Millions
12 Months Ended
Dec. 31, 2015
USD ($)
Defined Pension Benefits  
Defined Benefit Plan Disclosure [Line Items]  
Contributions are expected to be made $ 1
Other Postretirement Benefits  
Defined Benefit Plan Disclosure [Line Items]  
Contributions are expected to be made $ 2
Domestic Equity  
Defined Benefit Plan Disclosure [Line Items]  
Asset allocation targets 39.00%
Asset allocation targets, minimum 34.00%
Asset allocation targets, maximum 44.00%
International Equity  
Defined Benefit Plan Disclosure [Line Items]  
Asset allocation targets 16.00%
Asset allocation targets, minimum 11.00%
Asset allocation targets, maximum 21.00%
Fixed Income Securities  
Defined Benefit Plan Disclosure [Line Items]  
Asset allocation targets 45.00%
Asset allocation targets, minimum 35.00%
Asset allocation targets, maximum 55.00%