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Leases-Lessee (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Operating Leases, Future Minimum Payments Due, Fiscal Year Maturity [Abstract]      
2016 $ 77    
2017 63    
2018 46    
2019 36    
2020 32    
Thereafter 99    
Total 353    
Operating leases [Abstract]      
Total rent expense $ 157 $ 101 $ 51