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Leases (Supplemental Balance Sheet Information) (Details) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2019
Dec. 31, 2018
Operating Leases:    
Operating lease right-of-use assets [1] $ 470  
Other current liabilities 54  
Operating lease liabilities [2] 421  
Total operating lease liabilities 475  
Finance Leases:    
Accumulated depreciation (12,136) $ (11,932)
Property and equipment, net 14,878 $ 14,895
Current portion of long-term debt 5  
Long-term debt 174  
Total finance lease liabilities 179  
Right-of-use assets obtained in exchange for lease obligations:    
Operating leases $ 29  
Weighted Average Remaining Lease Term    
Operating leases weighted average remaining term 11 years 10 months 24 days  
Finance leases weighted average remaining term 6 years 4 months 24 days  
Weighted Average Discount Rate    
Operating leases weighted average discount rate 3.90%  
Finance leases weighted average discount rate 6.00%  
Leasehold Improvements [Member]    
Finance Leases:    
Property and equipment, at cost $ 171  
Accumulated depreciation (49)  
Property and equipment, net $ 122  
[1] Included in other assets.
[2] Included in other liabilities.