Property, Plant and Equipment (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Property, Plant and Equipment [Line Items]
Gross property, plant and equipment	$ 15,890	$ 15,059
Accumulated depreciation	(7,617)	(6,879)
Net property, plant and equipment	8,273	8,180
Depreciation expense	781	833	$ 834
Land
Property, Plant and Equipment [Line Items]
Gross property, plant and equipment	339	335
Fiber, conduit and other outside plant
Property, Plant and Equipment [Line Items]
Gross property, plant and equipment	$ 6,755	6,406
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	$ 5,283	5,106
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	$ 2,766	2,721
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	$ 747	$ 491