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Lease Commitments Lease Commitments (Balance Sheets) (Details) - USD ($)
$ in Millions
 9 Months Ended
Sep. 30, 2019
Dec. 31, 2018
Operating Leases    
Right-of-use asset $ 4,265  
Operating lease liability, current 1,315  
Noncurrent operating lease liabilities 2,750  
Total operating lease liabilities $ 4,065  
Weighted-average remaining lease term (in years) 5 years 3 months 18 days  
Weighted-average discount rate 3.20%  
Finance Leases    
Right-of-use asset $ 301  
FInance lease liability, current 21  
FInance lease liability, noncurrent 249  
FInance lease liability $ 270  
Weighted-average remaining lease term (in years) 15 years 7 months 6 days  
Weighted-average discount rate 4.90%  
Right-of-use asset obtained in exchange for operating lease liability $ 1,152  
Right-of-use asset obtained in exchange for finance lease liability $ 146  
Upstream    
Finance Leases    
Right-of-use asset   $ 818
Accumulated amortization   $ 617