Employee Benefits - Additional Information (Details) - Combined Pension Plan $ in Millions	1 Months Ended	12 Months Ended
	Sep. 30, 2022 USD ($)	Dec. 31, 2024 USD ($)	Dec. 31, 2023 USD ($)	Dec. 31, 2022 USD ($)	Jan. 01, 2022 USD ($) Employee	Dec. 31, 2021 USD ($)
Defined Benefit Plan Disclosure [Line Items]
Benefit obligation		$ 4,816	$ 5,212	$ 5,295		$ 9,678
Fair value of plan assets (liabilities)		4,201	4,476	4,715		$ 8,531
Contributions		$ 170	$ 0	$ 0
New Lumen Pension Plan
Defined Benefit Plan Disclosure [Line Items]
Number of active participants (in employees) | Employee					2,500
Number of other participants (in employees) | Employee					19,000
Benefit obligation					$ 2,500
Fair value of plan assets (liabilities)					$ 2,200
Contributions	$ 319