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Lease Commitments Lease Commitments (Balance Sheets) (Details) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2019
Dec. 31, 2018
Operating Leases    
Right-of-use asset $ 4,318  
Operating lease liability, current 1,387  
Noncurrent operating lease liabilities 2,742  
Total operating lease liabilities $ 4,129  
Weighted-average remaining lease term (in years) 5 years 2 months 12 days  
Weighted-average discount rate 3.10%  
Finance Leases    
Right-of-use asset $ 331  
FInance lease liability, current 27  
FInance lease liability, noncurrent 259  
FInance lease liability $ 286  
Weighted-average remaining lease term (in years) 15 years 9 months 18 days  
Weighted-average discount rate 5.00%  
Right-of-use asset obtained in exchange for operating lease liability $ 455  
Right-of-use asset obtained in exchange for finance lease liability $ 146  
Upstream    
Finance Leases    
Right-of-use asset   $ 818
Accumulated amortization   $ 617