Property and Equipment - Schedule of Construction in Progress (Details) - USD ($) $ in Millions	Dec. 31, 2020	Dec. 31, 2019
Property, Plant and Equipment [Line Items]
Construction in progress	$ 510	$ 505
Satellite system
Property, Plant and Equipment [Line Items]
Construction in progress	429	371
Terrestrial repeater network
Property, Plant and Equipment [Line Items]
Construction in progress	8	7
Capitalized software and hardware
Property, Plant and Equipment [Line Items]
Construction in progress	52	107
Other
Property, Plant and Equipment [Line Items]
Construction in progress	$ 21	$ 20