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Other Financial Information - Other Current Assets (Details) - USD ($)
$ in Millions
Jun. 30, 2018
Dec. 31, 2017
Deferred Costs, Capitalized, Prepaid, and Other Assets Disclosure [Abstract]    
Prepaid expenses $ 90 $ 68
Material, supplies and inventory 4 3
Deferred activation and installation charges 19 17
Deferred commissions 16 0
Other 72 29
Total other current assets $ 201 $ 117