Long-Term Debt and Credit Facilities - Additional Information (Details) - USD ($) $ in Millions	3 Months Ended	6 Months Ended
	Jun. 30, 2023	Jun. 30, 2023	Jun. 30, 2022	Apr. 17, 2023	Mar. 31, 2023
Long-term Debt and Credit Facilities
Reduction in aggregate principal amount of debt		$ 630
Net gain on early retirement of debt		618	$ 0
Borrowings from revolving credit facility	$ 525	525
Repayments of revolving credit facility	$ 325	$ 325
Senior Notes | Lumen Technologies, Inc.
Long-term Debt and Credit Facilities
Face amount				$ 19	$ 1,535
Repurchased face amount					24
Senior Notes | 10.500% Senior Secured Notes due 2030 | Level 3 Financing, Inc.
Long-term Debt and Credit Facilities
Face amount				$ 9	$ 915
Stated interest rate (as a percent )				10.50%	10.50%