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Property and Equipment - Depreciation Expense and Capitalized Interest (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Property, Plant and Equipment [Abstract]        
Depreciation expense $ 277 $ 135 $ 792 $ 303
Capitalized interest $ 2 $ 2 $ 5 $ 4