Property and Equipment - Schedule of Construction in Progress (Details) - USD ($) $ in Millions	Sep. 30, 2021	Dec. 31, 2020
Property, Plant and Equipment [Line Items]
Construction in progress	$ 288	$ 510
Satellite system
Property, Plant and Equipment [Line Items]
Construction in progress	49	429
Terrestrial repeater network
Property, Plant and Equipment [Line Items]
Construction in progress	11	8
Capitalized software and hardware
Property, Plant and Equipment [Line Items]
Construction in progress	195	52
Other
Property, Plant and Equipment [Line Items]
Construction in progress	$ 33	$ 21