Repurchases of Lumen Common Stock (Details) - USD ($) shares in Millions		1 Months Ended	3 Months Ended	9 Months Ended
	Aug. 03, 2021	Oct. 31, 2021	Sep. 30, 2021	Sep. 30, 2021
Equity [Abstract]
Repurchase program, period	24 months
Repurchase program, authorized amount	$ 1,000,000,000
Equity, Class of Treasury Stock [Line Items]
Number of shares repurchased			73.8	73.8
Repurchases of common stock			$ 909,000,000	$ 909,000,000
Subsequent Event
Equity, Class of Treasury Stock [Line Items]
Number of shares repurchased		3.5
Repurchases of common stock		$ 45,000,000