Property, Plant and Equipment (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Property, Plant and Equipment [Abstract]
Depreciation expense	$ 712	$ 756	$ 781
Property, Plant and Equipment [Line Items]
Gross property, plant and equipment	17,775	16,939
Accumulated depreciation	(8,910)	(8,239)
Net property, plant and equipment	8,865	8,700
Land
Property, Plant and Equipment [Line Items]
Gross property, plant and equipment	329	334
Fiber, conduit and other outside plant
Property, Plant and Equipment [Line Items]
Gross property, plant and equipment	$ 8,246	7,126
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 [Line Items]
Gross property, plant and equipment	$ 5,792	5,488
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 [Line Items]
Gross property, plant and equipment	$ 2,878	2,845
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 [Line Items]
Gross property, plant and equipment	$ 530	$ 1,146