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Leases - Classification of Operating and Finance Leases (Details) - USD ($)
$ in Millions
Jun. 30, 2019
Jan. 01, 2019
Dec. 31, 2018
Operating Leases      
Operating lease right-of-use assets $ 963 $ 975 $ 0
Short-term operating lease liabilities 112 112 0
Long-term operating lease liabilities 927 $ 949 0
Total operating lease liabilities 1,039    
Finance Leases      
Property, plant and equipment 12,348   12,074
Less: Accumulated depreciation and amortization 9,030   8,728
Property, plant and equipment, net 3,318   3,346
Current portion of long-term debt 21   21
Long-term debt, net 2,409   $ 2,418
Total finance lease liabilities 6    
Operating leases      
Operating Leases      
Operating lease right-of-use assets 963    
Short-term operating lease liabilities 112    
Long-term operating lease liabilities 927    
Total operating lease liabilities 1,039    
Finance leases      
Finance Leases      
Property, plant and equipment 17    
Less: Accumulated depreciation and amortization 4    
Property, plant and equipment, net 13    
Current portion of long-term debt 1    
Long-term debt, net 5    
Total finance lease liabilities $ 6