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Commitments and Contingencies - Commitments (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Leases and rights-of-way easements      
2017 $ 195    
2018 165    
2019 140    
2020 118    
2021 97    
Thereafter 404    
Total 1,119    
Other commitments      
2017 257    
2018 166    
2019 153    
2020 132    
2021 128    
Thereafter 378    
Total 1,214    
Total      
2017 452    
2018 331    
2019 293    
2020 250    
2021 225    
Thereafter 782    
Total 2,333    
Lease expense 198 $ 164 $ 145
Agreement to Transport Crude Oil | Equity Method Investees      
Other commitments      
Total $ 855    
Total      
Ownership interest 50.00%