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Post Employment Benefit Plans - Defined Contribution Plan (Details) (USD $)
In Millions, unless otherwise specified
3 Months Ended 9 Months Ended
Sep. 30, 2014
Sep. 30, 2013
Sep. 30, 2014
plan
Sep. 30, 2013
Defined Contribution Plan Disclosure [Line Items]        
Defined contribution plan, number of plans     1  
Defined contribution plan, cost recognized $ 1 $ 1 $ 2 $ 3
Minimum
       
Defined Contribution Plan Disclosure [Line Items]        
Defined contribution plan, employer matching contribution, percent of employees' gross pay     2.00%  
Maximum
       
Defined Contribution Plan Disclosure [Line Items]        
Defined contribution plan, employer matching contribution, percent of employees' gross pay     6.00%