XML 105 R87.htm IDEA: XBRL DOCUMENT v3.8.0.1
Commitments and Contingencies - Commitments (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Leases, rights-of-way easements and other      
2018 $ 188    
2019 155    
2020 127    
2021 107    
2022 90    
Thereafter 363    
Total 1,030    
Other commitments      
2018 205    
2019 178    
2020 145    
2021 127    
2022 109    
Thereafter 299    
Total 1,063    
Total      
2018 393    
2019 333    
2020 272    
2021 234    
2022 199    
Thereafter 662    
Total 2,093    
Lease expense 207 $ 198 $ 164
Expenses associated with agreements 197 $ 157 $ 85
Agreement to Transport Crude Oil | Equity Method Investees      
Other commitments      
Total $ 760    
Total      
Ownership interest 50.00%