Revenue Recognition - Schedule of Capitalized Contract Costs (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2026	Jun. 30, 2025	Jun. 30, 2026	Jun. 30, 2025
Acquisition Costs
Capitalized Contract Cost [Roll Forward]
Beginning of period balance	$ 197	$ 210	$ 196	$ 203
Costs incurred	21	32	55	72
Amortization	(24)	(32)	(55)	(65)
Change in contract costs held for sale	(34)	0	(36)	0
End of period balance	160	210	160	210
Acquisition Costs \| Held for sale \| Mass Markets Fiber-to-the Home Business
Capitalized Contract Cost [Roll Forward]
Beginning of period balance			24
Fulfillment Costs
Capitalized Contract Cost [Roll Forward]
Beginning of period balance	274	236	264	222
Costs incurred	59	58	111	109
Amortization	(43)	(39)	(85)	(76)
Change in contract costs held for sale	0	(14)	0	(14)
End of period balance	$ 290	241	290	241
Fulfillment Costs \| Held for sale \| Mass Markets Fiber-to-the Home Business
Capitalized Contract Cost [Roll Forward]
Beginning of period balance			$ 21
End of period balance		$ 14		$ 14