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Property Plant and Equipment (Narrative) (Details) - USD ($)
$ in Millions
Dec. 31, 2018
Dec. 31, 2017
Property, Plant and Equipment [Line Items]    
Accumulated depreciation $ 3,677 $ 2,275
Assets Held under Capital Leases [Member]    
Property, Plant and Equipment [Line Items]    
Gross assets 25 25
Accumulated depreciation $ 9 $ 9