Summary of Significant Accounting Policies Other long-term liabilities (Details) - USD ($) $ in Millions	Dec. 31, 2023	Dec. 31, 2022
Other long term liabilities [Abstract]
Asset Retirement Obligation, Current	$ 15	$ 7
Unrecognized Tax Benefits	6	6
Liability, Retirement and Postemployment Benefits	8	8
Liability, Pension and Other Postretirement and Postemployment Benefits, Noncurrent	7	7
Pension benefit obligation	2	1
Other long term liabilities	23	25
Other long-term liabilities	$ 61	$ 53