Goodwill and Intangible Assets - Schedule of Goodwill (Details) - USD ($) $ in Millions	Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2023
Goodwill and Intangible Assets Disclosure [Abstract]
Goodwill	$ 3,638	$ 6,955	$ 6,955
Intangible assets, net	111	84
Accumulated impairment losses	4,417	2,405	$ 2,400
Accumulated amortization	1,642	$ 1,841
Held-for-sale | Lumen Mass Markets fiber-to-the-home business
Finite-Lived Intangible Assets [Line Items]
Goodwill classified as held for sale	$ 1,070