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Long-Term Debt and Credit Facilities - Credit Facilities Transactions (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2025	Sep. 30, 2024	Mar. 27, 2025
Long-term Debt and Credit Facilities
Net loss (gain) on early retirement of debt	$ 395	$ 1	$ 666	$ (277)
Level 3 Financing, Inc. | Term Loan B-3 | Term Loan
Long-term Debt and Credit Facilities
Net loss (gain) on early retirement of debt	$ 56		56
Level 3 Financing, Inc. | Term Loan B-3 | Term Loan
Long-term Debt and Credit Facilities
Long-term debt, gross					$ 2,400
Level 3 Financing, Inc. | Term Loan B-1 and Term Loan B-2 | Term Loan
Long-term Debt and Credit Facilities
Net loss (gain) on early retirement of debt			$ 35

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