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Leases - Supplemental Balance Sheet Information Related to Leases (Details) - USD ($)
$ in Millions
Sep. 30, 2019
Dec. 31, 2018
Operating leases:    
Operating lease assets $ 2,110  
Short-term operating lease liabilities 454  
Operating lease liabilities 1,671  
Total operating lease liabilities 2,125  
Finance leases:    
Property and equipment, gross 410  
Accumulated depreciation (124)  
Property and equipment, net 286  
Short-term borrowings and current maturities of long-term debt 55  
Long-term debt 216  
Total finance lease liabilities $ 271 $ 289
Weighted-average remaining lease term    
Operating leases 7 years  
Finance leases 5 years  
Weighted-average discount rate    
Operating leases 5.11%  
Finance leases 2.58%