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Commitments and Contingencies (Details Textuals) - USD ($)
 12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Commitments And Contingencies (Textuals) [Abstract]      
Range of possible loss, minimum $ 0    
Range of possible loss, maximum 350,000,000    
Amount of rentals subject to subleasing arrangements 37,000,000    
Future minimum payments on capital leases due, in 2016 4,000,000    
Future minimum payments on capital leases due, in 2017 4,000,000    
Future minimum payments on capital leases due, in 2018 4,000,000    
Future minimum payments on capital leases due, in 2019 4,000,000    
Future minimum payments on capital leases due, in 2020 4,000,000    
Future minimum payments on capital leases due, thereafter 14,000,000    
Total rental expense $ 187,000,000 $ 237,000,000 $ 281,000,000