Long-Term Debt - Financing Credit Agreement (Details) - USD ($) $ in Millions	Mar. 22, 2024	Mar. 31, 2024
Debt Instrument [Line Items]
Aggregate principal amount		$ 7,548
Prepaid on or prior to the 12-month anniversary of the effective date
Debt Instrument [Line Items]
Prepayment premium, rate	1.00%
New Level 3 Credit Agreement | Prepaid after the 12-month anniversary and on or prior to the 24-month anniversary of the effective date
Debt Instrument [Line Items]
Prepayment premium, rate	2.00%
Term loan | Secured Term B-1 Loan Facility
Debt Instrument [Line Items]
Aggregate principal amount	$ 1,200
Term loan | Secured Term B-2 Loan Facility
Debt Instrument [Line Items]
Aggregate principal amount	$ 1,200
Term loan | New Level 3 Credit Agreement
Debt Instrument [Line Items]
Floor interest rate	2.00%
Term loan | New Level 3 Credit Agreement | SOFR
Debt Instrument [Line Items]
Basis spread on variable rate (as a percent)	6.56%
Term loan | New Level 3 Credit Agreement | Base Rate
Debt Instrument [Line Items]
Basis spread on variable rate (as a percent)	5.56%