Property, Plant and Equipment - Schedule of Property, Plant and Equipment (Details) - USD ($) $ in Millions	Jun. 30, 2025	Dec. 31, 2024
Property, Plant and Equipment [Line Items]
Gross property, plant and equipment	$ 41,823	$ 43,542
Accumulated depreciation	(23,158)	(23,121)
Net property, plant and equipment	18,665	20,421
Land
Property, Plant and Equipment [Line Items]
Gross property, plant and equipment	629	630
Fiber, conduit and other outside plant
Property, Plant and Equipment [Line Items]
Gross property, plant and equipment	$ 16,231	17,348
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	$ 16,238	16,616
Central office and other network electronics | Minimum
Property, Plant and Equipment [Line Items]
Depreciable Lives	3 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	$ 6,907	6,804
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	$ 1,818	$ 2,144