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Property, Plant and Equipment (Tables)
 9 Months Ended
Sep. 30, 2025
Property, Plant and Equipment [Abstract]  
Schedule of Net Property, Plant and Equipment
Net property, plant and equipment is composed of the following:
 Depreciable
Lives		September 30, 2025December 31, 2024
 
  (Dollars in millions)
LandN/A$628 630 
Fiber, conduit and other outside plant (1)
15-45 years
16,447 17,348 
Central office and other network electronics(2)
3-10 years
16,346 16,616 
Support assets(3)
3-30 years
6,903 6,804 
Construction in progress(4)
N/A2,203 2,144 
Gross property, plant and equipment 42,527 43,542 
Accumulated depreciation (23,420)(23,121)
Net property, plant and equipment $19,107 20,421 
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(1)Fiber, conduit and other outside plant consists of fiber and metallic cable, conduit, poles, and other supporting structures.
(2)Central office and other network electronics consists of circuit and packet switches, routers, transmission electronics, and electronics providing service to customers.
(3)Support assets consist of buildings, data centers, computers, and other administrative and support equipment.
(4)Construction in progress includes inventory held for construction and property of the aforementioned categories that has not been placed in service as it is still under construction.