Property, Plant and Equipment - Net Property, Plant and Equipment (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020
Property, Plant and Equipment, Net [Abstract]
Gross property, plant and equipment	$ 12,244	$ 13,336
Accumulated depreciation	(3,202)	(2,818)
Net property, plant and equipment	9,042	10,518
Land
Property, Plant and Equipment, Net [Abstract]
Gross property, plant and equipment	305	320
Fiber conduit and other outside plant
Property, Plant and Equipment, Net [Abstract]
Gross property, plant and equipment	$ 5,531	6,186
Fiber conduit and other outside plant | Minimum
Property, Plant and Equipment [Line Items]
Depreciable Lives	15 years
Fiber conduit and other outside plant | Maximum
Property, Plant and Equipment [Line Items]
Depreciable Lives	45 years
Central office and other network electronics
Property, Plant and Equipment, Net [Abstract]
Gross property, plant and equipment	$ 3,280	3,388
Central office and other network electronics | Minimum
Property, Plant and Equipment [Line Items]
Depreciable Lives	7 years
Central office and other network electronics | Maximum
Property, Plant and Equipment [Line Items]
Depreciable Lives	10 years
Support assets
Property, Plant and Equipment, Net [Abstract]
Gross property, plant and equipment	$ 2,504	2,722
Support assets | Minimum
Property, Plant and Equipment [Line Items]
Depreciable Lives	3 years
Support assets | Maximum
Property, Plant and Equipment [Line Items]
Depreciable Lives	30 years
Construction-in-progress
Property, Plant and Equipment, Net [Abstract]
Gross property, plant and equipment	$ 624	$ 720