Long-Term Debt and Credit Facilities - Additional Information (Details) - USD ($) $ in Millions		3 Months Ended	9 Months Ended
	Apr. 17, 2023	Sep. 30, 2023	Sep. 30, 2023	Sep. 30, 2022	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	$ 9
Revolving Credit Facility
Long-term Debt and Credit Facilities
Borrowings from revolving credit facility		$ 150	675
Repayments of revolving credit facility		275	$ 600
Letter of Credit
Long-term Debt and Credit Facilities
Borrowings from revolving credit facility		$ 110
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%