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Leases Lessee Disclosure - Supplemental Balance Sheet Information (Details) - USD ($)
$ in Millions
Mar. 31, 2019
Jan. 01, 2019
Dec. 31, 2018
Assets and Liabilities, Lessee [Abstract]      
Operating lease assets, net $ 544 $ 567 $ 0
Finance lease assets (1) [1] 38    
Total lease assets, net 582    
Current portion of operating lease liabilities 130 126 0
Current portion of finance lease liabilities 12   0
Long-term operating lease liabilities 473 $ 500 $ 0
Non-current portion of finance lease liabilities 20    
Total lease liabilities $ 635    
Operating leases, Weighted Average Remaining Lease Term 5 years 8 months 12 days    
Finance leases, Weighted Average Remaining Lease Term 3 years 3 months 18 days    
Operating leases, Weighted Average Discount Rate 5.30%    
Finance leases, Weighted Average Discount Rate 3.90%    
Finance lease assets, Amortization $ (32)    
[1] (1)Finance lease assets are recorded net of accumulated amortization of $32 million.