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Leases - Lease-related Assets and Liabilities recorded on the Balance Sheet (Details) - USD ($) $ in Millions	Dec. 31, 2024	Dec. 31, 2023
Assets
Operating lease assets	$ 8	$ 9
Finance lease assets	109	156
Total lease assets	$ 117	$ 165
Finance Lease, Right-of-Use Asset, Statement of Financial Position [Extensible List]	Property and equipment, net	Property and equipment, net
Liabilities
Current portion of operating lease liability	$ 4	$ 6
Current portion of finance lease liability	57	66
Noncurrent portion of operating lease liability	5	6
Noncurrent portion of finance lease liability	30	63
Total lease liabilities	$ 96	$ 141
Weighted-average remaining lease term
Weighted-average remaining lease term, operating leases	3 years 5 months 26 days	2 years 1 month 28 days
Weighted-average remaining lease term, finance leases	1 year 7 months 24 days	2 years 21 days
Weighted-average discount rate
Weighted-average discount rate, operating leases	5.40%	5.00%
Weighted-average discount rate, finance leases	6.83%	6.28%

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