Leases - Narrative (Details) - USD ($) $ in Millions	Dec. 31, 2024	Oct. 01, 2024	Dec. 31, 2023
Lessee, Lease, Description [Line Items]
Present value of lease liabilities	$ 145		$ 99
Operating lease, right-of-use asset	$ 145		$ 99
Operating Lease, Right-of-Use Asset, Statement of Financial Position [Extensible Enumeration]	Other long-term assets		Other long-term assets
Southwestern
Lessee, Lease, Description [Line Items]
Present value of lease liabilities		$ 134
Operating lease, right-of-use asset		$ 134