Employee Benefits - Additional Information (Details) $ in Millions	1 Months Ended
	Sep. 30, 2022 USD ($)	Dec. 31, 2023 USD ($)	Dec. 31, 2022 USD ($)	Jan. 01, 2022 USD ($) Employee	Dec. 31, 2021 USD ($) retiree	Dec. 31, 2020 USD ($)
Combined Pension Plan
Defined Benefit Plan Disclosure [Line Items]
Benefit obligation		$ 5,212	$ 5,295		$ 9,678	$ 12,202
Fair value of plan assets (liabilities)		$ 4,476	$ 4,715		8,531	$ 10,546
Combined Pension Plan | 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
US
Defined Benefit Plan Disclosure [Line Items]
Pension liability					$ 1,400
US | Combined Pension Plan
Defined Benefit Plan Disclosure [Line Items]
Number of retirees | retiree					22,600