Property, Plant and Equipment - Net Property, Plant and Equipment (Details) - USD ($) $ in Millions	Dec. 31, 2023	Dec. 31, 2022
Property, Plant and Equipment, Net [Abstract]
Gross property, plant and equipment	$ 11,063	$ 10,178
Accumulated depreciation	(3,665)	(2,875)
Net property, plant and equipment	7,398	7,303
Land
Property, Plant and Equipment, Net [Abstract]
Gross property, plant and equipment	202	202
Fiber conduit and other outside plant
Property, Plant and Equipment, Net [Abstract]
Gross property, plant and equipment	$ 4,380	4,133
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	$ 3,467	2,977
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	$ 2,252	2,145
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	$ 762	$ 721