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Commitments and Contingencies - Commitments (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Leases      
2016 $ 200    
2017 184    
2018 154    
2019 128    
2020 108    
Thereafter 427    
Total 1,201    
Lease expense 164 $ 145 $ 132
Other commitments      
2016 150    
2017 152    
2018 133    
2019 127    
2020 129    
Thereafter 487    
Total 1,178    
Total      
2016 350    
2017 336    
2018 287    
2019 255    
2020 237    
Thereafter 914    
Total 2,379    
Agreement to Transport Crude Oil | Equity Method Investees      
Other commitments      
Total $ 930    
Ownership interest (as a percent) 50.00%