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Leases - Supplemental Balance Sheet Information (Details) - USD ($)
$ in Millions
Sep. 30, 2019
Jan. 01, 2019
Dec. 31, 2018
Operating Leases      
Operating Lease ROU Assets $ 828 $ 882 $ 0
Operating Lease Liabilities due Within One Year 197 204 0
Operating Lease Liabilities 642 $ 684 0
Total Operating Lease Liabilities 839    
Finance Leases      
Property, Plant and Equipment, at cost 256    
Accumulated Depreciation (47)    
Property, Plant and Equipment, net 209    
Long Term Debt and Finance Leases due Within One Year 7    
Long Term Debt and Finance Leases 238    
Total Finance Lease Liabilities $ 245   $ 37
Weighted Average Remaining Lease Term      
Operating Leases 6 years 10 months 24 days    
Finance Leases 32 years    
Weighted Average Discount Rate      
Operating Leases 6.72%    
Finance Leases 8.47%