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Leases (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Leases [Abstract]      
Rental expenses $ 100 $ 115 $ 111
Future minimum lease payments with respect to capital leases [Abstract]      
2016 18    
2017 15    
2018 10    
2019 5    
2020 4    
Thereafter 47    
Future minimum lease payments 99    
Less: amount representing interest (39)    
Lease obligations at December 31, 2015 60    
Future minimum lease payments with respect to operating leases [Abstract]      
2016 109    
2017 81    
2018 62    
2019 54    
2020 50    
Thereafter 139    
Future minimum lease payments 495    
Less: amount representing interest 0    
Lease obligations at December 31, 2015 $ 495