Long-Term Debt - Debt Modification Transactions (Details) - USD ($)	Dec. 31, 2024	Nov. 30, 2024	Mar. 31, 2024	Dec. 31, 2023	Apr. 17, 2023	Mar. 31, 2023
Debt Instrument [Line Items]
Aggregate principal amount			$ 7,548,000,000
Senior Notes
Debt Instrument [Line Items]
Aggregate principal amount	$ 357,000,000	$ 324,000,000
Senior Notes | Lumen
Debt Instrument [Line Items]
Aggregate principal amount					$ 19,000,000	$ 1,535,000,000
Senior Notes | 10.500% Senior Secured Notes Due 2030
Debt Instrument [Line Items]
Aggregate principal amount					$ 9,000,000	$ 915,000,000
Stated interest rate				10.50%	10.50%	10.50%