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Lease Commitments (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Schedule of capitalized leased assets      
Upstream $ 719 $ 678  
Downstream 99 99  
All Other 0 0  
Total 818 777  
Less: Accumulated amortization 617 515  
Net capitalized leased assets 201 262  
Rental expenses incurred for operating leases      
Minimum rentals 820 726 $ 943
Contingent rentals 1 1 2
Total 821 727 945
Less: Sublease rental income 5 6 7
Net rental expense $ 816 $ 721 $ 938
Non-cancelable term of operating and capital leases (in years) 1 year    
Operating Leases      
Operating Leases, 2019 $ 540    
Operating Leases, 2020 492    
Operating Leases, 2021 378    
Operating Leases, 2022 242    
Operating Leases, 2023 166    
Operating Leases, Thereafter 341    
Operating Leases, Total 2,159    
Capital Leases      
Capital Leases, 2019 30    
Capital Leases, 2020 22    
Capital Leases, 2021 17    
Capital Leases, 2022 16    
Capital Leases, 2023 16    
Capital Leases, Thereafter 132    
Capital Leases, Total 233    
Less: Amounts representing interest and executory costs (88)    
Net present values 145    
Less: Capital lease obligations included in short-term debt (18)    
Long-term capital lease obligations 127    
Lessee, Capital Lease, Lease Not yet Commenced, Future Payments [Abstract]      
2019 14    
2020 15    
2021 22    
2022 21    
2023 21    
Thereafter $ 219