Repurchases of Lumen Common Stock (Details) - USD ($)		3 Months Ended	12 Months Ended
	Aug. 03, 2021	Dec. 31, 2022	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Equity [Abstract]
Repurchase program, period (in years)	24 months	2 years
Repurchase program, authorized amount	$ 1,000,000,000	$ 1,500,000,000		$ 1,500,000,000
Number of shares repurchased			0	33,000,000	80,900,000
Repurchases of common stock				$ 200,000,000	$ 1,000,000,000
Average purchase price (in dollars per share)				$ 6.07	$ 12.36
Common Stock
Equity [Abstract]
Repurchases of common stock			$ 0	$ 33,000,000	$ 81,000,000
Equity, Class of Treasury Stock [Line Items]
Repurchased common stock that were retired				33,000,000	81,000,000
Additional Paid-in Capital
Equity [Abstract]
Repurchases of common stock			$ 0	167,000,000	919,000,000
Equity, Class of Treasury Stock [Line Items]
Repurchased common stock that were retired				$ 167,000,000	$ 919,000,000