Revenue Recognition - Capitalized Contract Costs (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2025	Jun. 30, 2024	Jun. 30, 2025	Jun. 30, 2024
Acquisition Costs
Capitalized Contract Cost [Roll Forward]
Beginning of period balance	$ 210	$ 182	$ 203	$ 182
Costs incurred	32	35	72	68
Amortization	(32)	(32)	(65)	(65)
Change in contract costs held for sale	0		0
End of period balance	210	185	210	185
Fulfillment Costs
Capitalized Contract Cost [Roll Forward]
Beginning of period balance	236	189	222	184
Costs incurred	58	49	109	85
Amortization	(39)	(34)	(76)	(65)
Change in contract costs held for sale	(14)		(14)
End of period balance	241	$ 204	241	$ 204
Fulfillment Costs | Held for sale | Mass Markets Fiber-to-the Home Business
Capitalized Contract Cost [Roll Forward]
End of period balance	$ 14		$ 14