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Employee Benefit Plans Accumulated Pension Benefit Obligation (Details) (USD $)
In Millions, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Compensation and Retirement Disclosure [Abstract]    
Accumulated pension benefit obligation $ 118us-gaap_DefinedBenefitPlanAccumulatedBenefitObligation $ 120us-gaap_DefinedBenefitPlanAccumulatedBenefitObligation