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Long-Term Debt and Credit Facilities - Redemptions (Details) - Senior Notes - USD ($) $ in Millions	Sep. 30, 2025	Feb. 15, 2025
Long-term Debt and Credit Facilities
Aggregate principal amount		$ 202
5.625% unsecured Senior notes due 2025
Long-term Debt and Credit Facilities
Stated interest rate		5.625%
Aggregate principal amount		$ 55
7.200% unsecured Senior notes due 2025
Long-term Debt and Credit Facilities
Stated interest rate		7.20%
Aggregate principal amount		$ 29
5.125% unsecured Senior notes due 2026
Long-term Debt and Credit Facilities
Stated interest rate		5.125%
Aggregate principal amount		$ 7
4.000% unsecured Senior notes due 2027
Long-term Debt and Credit Facilities
Stated interest rate		4.00%
Aggregate principal amount		$ 41
3.400% unsecured Senior notes due 2027 | Level 3 Financing, Inc.
Long-term Debt and Credit Facilities
Stated interest rate		3.40%
Aggregate principal amount		$ 5
4.625% unsecured Senior notes due 2027 | Level 3 Financing, Inc.
Long-term Debt and Credit Facilities
Stated interest rate		4.625%
Aggregate principal amount		$ 65
10.000% Second Lien Notes due 2032 | Level 3 Financing, Inc.
Long-term Debt and Credit Facilities
Stated interest rate	10.00%
Aggregate principal amount	$ 350

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