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Lease Commitments (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Schedule of capitalized leased assets      
Upstream $ 678 $ 676  
Downstream 99 99  
All Other 0 0  
Total 777 775  
Less: Accumulated amortization 515 383  
Net capitalized leased assets 262 392  
Rental expenses incurred for operating leases      
Minimum rentals 726 943 $ 1,041
Contingent rentals 1 2 2
Total 727 945 1,043
Less: Sublease rental income 6 7 9
Net rental expense $ 721 938 $ 1,034
Non-cancelable term of operating and capital leases (in years) 1 year    
Estimated future minimum lease payments (net of noncancelable sublease rentals) under operating and capital leases      
Operating Leases, 2018 $ 693    
Capital Leases, 2018 26    
Operating Leases, 2019 628    
Capital Leases, 2019 22    
Operating Leases, 2020 474    
Capital Leases, 2020 13    
Operating Leases, 2021 339    
Capital Leases, 2021 12    
Operating Leases, 2022 223    
Capital Leases, 2022 11    
Operating Leases, Thereafter 538    
Capital Leases, Thereafter 142    
Operating Leases, Total 2,895    
Capital Leases, Total 226    
Less: Amounts representing interest and executory costs (117)    
Net present values 109    
Less: Capital lease obligations included in short-term debt (15)    
Long-term capital lease obligations $ 94 $ 93  
Maximum      
Rental expenses incurred for operating leases      
Contingent rentals, renewal option term (in years) 25 years