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Leases - Supplemental Balance Sheet Information (Details) - USD ($)
$ in Millions
Jun. 30, 2019
Dec. 31, 2018
Leases [Abstract]    
Total operating lease liabilities $ 637 $ 0
Other current liabilities 197  
Operating lease liabilities 447 $ 0
Total operating lease liabilities 644  
Finance leases, net of amortization (within property, plant & equipment) 58  
Other current liabilities 21  
Other long-term liabilities 40  
Total finance lease liabilities $ 61  
Operating leases, weighted average remaining lease term 5 years  
Finance leases, weighted average remaining lease term 3 years 1 month 6 days  
Operating leases, weighted average discount rate 3.50%  
Finance leases, weighted average discount rate 4.80%