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Leases - Supplemental Balance Sheet Information (Details) - USD ($)
$ in Millions
Mar. 31, 2019
Dec. 31, 2018
Leases [Abstract]    
Total operating lease liabilities $ 636 $ 0
Other current liabilities 179  
Operating lease liabilities 470 $ 0
Total operating lease liabilities 649  
Finance leases, net of amortization (within property, plant & equipment) 53  
Other current liabilities 18  
Other long-term liabilities 37  
Total finance lease liabilities $ 55  
Operating leases, weighted average remaining lease term 5 years 4 months 24 days  
Finance leases, weighted average remaining lease term 2 years 10 months 24 days  
Operating leases, weighted average discount rate 3.60%  
Finance leases, weighted average discount rate 5.20%